Update built files

4 files changed, 6053 insertions, 7031 deletions

diff --git a/dist/async.js b/dist/async.js
index 72264cc..1e9b8bf 100644
--- a/dist/async.js
+++ b/dist/async.js
@@ -1,4580 +1,3618 @@
 (function (global, factory) {
-  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-  typeof define === 'function' && define.amd ? define(['exports'], factory) :
-  (factory((global.async = global.async || {})));
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (factory((global.async = {})));
 }(this, (function (exports) { 'use strict';
 
-function slice(arrayLike, start) {
-    start = start|0;
-    var newLen = Math.max(arrayLike.length - start, 0);
-    var newArr = Array(newLen);
-    for(var idx = 0; idx < newLen; idx++)  {
-        newArr[idx] = arrayLike[start + idx];
+    /**
+     * Creates a continuation function with some arguments already applied.
+     *
+     * Useful as a shorthand when combined with other control flow functions. Any
+     * arguments passed to the returned function are added to the arguments
+     * originally passed to apply.
+     *
+     * @name apply
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {Function} fn - The function you want to eventually apply all
+     * arguments to. Invokes with (arguments...).
+     * @param {...*} arguments... - Any number of arguments to automatically apply
+     * when the continuation is called.
+     * @returns {Function} the partially-applied function
+     * @example
+     *
+     * // using apply
+     * async.parallel([
+     *     async.apply(fs.writeFile, 'testfile1', 'test1'),
+     *     async.apply(fs.writeFile, 'testfile2', 'test2')
+     * ]);
+     *
+     *
+     * // the same process without using apply
+     * async.parallel([
+     *     function(callback) {
+     *         fs.writeFile('testfile1', 'test1', callback);
+     *     },
+     *     function(callback) {
+     *         fs.writeFile('testfile2', 'test2', callback);
+     *     }
+     * ]);
+     *
+     * // It's possible to pass any number of additional arguments when calling the
+     * // continuation:
+     *
+     * node> var fn = async.apply(sys.puts, 'one');
+     * node> fn('two', 'three');
+     * one
+     * two
+     * three
+     */
+    function apply(fn, ...args) {
+        return (...callArgs) => fn(...args,...callArgs);
     }
-    return newArr;
-}
-
-/**
- * Creates a continuation function with some arguments already applied.
- *
- * Useful as a shorthand when combined with other control flow functions. Any
- * arguments passed to the returned function are added to the arguments
- * originally passed to apply.
- *
- * @name apply
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {Function} fn - The function you want to eventually apply all
- * arguments to. Invokes with (arguments...).
- * @param {...*} arguments... - Any number of arguments to automatically apply
- * when the continuation is called.
- * @returns {Function} the partially-applied function
- * @example
- *
- * // using apply
- * async.parallel([
- *     async.apply(fs.writeFile, 'testfile1', 'test1'),
- *     async.apply(fs.writeFile, 'testfile2', 'test2')
- * ]);
- *
- *
- * // the same process without using apply
- * async.parallel([
- *     function(callback) {
- *         fs.writeFile('testfile1', 'test1', callback);
- *     },
- *     function(callback) {
- *         fs.writeFile('testfile2', 'test2', callback);
- *     }
- * ]);
- *
- * // It's possible to pass any number of additional arguments when calling the
- * // continuation:
- *
- * node> var fn = async.apply(sys.puts, 'one');
- * node> fn('two', 'three');
- * one
- * two
- * three
- */
-var apply = function(fn/*, ...args*/) {
-    var args = slice(arguments, 1);
-    return function(/*callArgs*/) {
-        var callArgs = slice(arguments);
-        return fn.apply(null, args.concat(callArgs));
-    };
-};
 
-var initialParams = function (fn) {
-    return function (/*...args, callback*/) {
-        var args = slice(arguments);
-        var callback = args.pop();
-        fn.call(this, args, callback);
-    };
-};
-
-/**
- * Checks if `value` is the
- * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
- * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
- *
- * @static
- * @memberOf _
- * @since 0.1.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is an object, else `false`.
- * @example
- *
- * _.isObject({});
- * // => true
- *
- * _.isObject([1, 2, 3]);
- * // => true
- *
- * _.isObject(_.noop);
- * // => true
- *
- * _.isObject(null);
- * // => false
- */
-function isObject(value) {
-  var type = typeof value;
-  return value != null && (type == 'object' || type == 'function');
-}
-
-var hasSetImmediate = typeof setImmediate === 'function' && setImmediate;
-var hasNextTick = typeof process === 'object' && typeof process.nextTick === 'function';
-
-function fallback(fn) {
-    setTimeout(fn, 0);
-}
-
-function wrap(defer) {
-    return function (fn/*, ...args*/) {
-        var args = slice(arguments, 1);
-        defer(function () {
-            fn.apply(null, args);
+    function initialParams (fn) {
+        return function (...args/*, callback*/) {
+            var callback = args.pop();
+            return fn.call(this, args, callback);
+        };
+    }
+
+    var hasSetImmediate = typeof setImmediate === 'function' && setImmediate;
+    var hasNextTick = typeof process === 'object' && typeof process.nextTick === 'function';
+
+    function fallback(fn) {
+        setTimeout(fn, 0);
+    }
+
+    function wrap(defer) {
+        return (fn, ...args) => defer(() => fn(...args));
+    }
+
+    var _defer;
+
+    if (hasSetImmediate) {
+        _defer = setImmediate;
+    } else if (hasNextTick) {
+        _defer = process.nextTick;
+    } else {
+        _defer = fallback;
+    }
+
+    var setImmediate$1 = wrap(_defer);
+
+    /**
+     * Take a sync function and make it async, passing its return value to a
+     * callback. This is useful for plugging sync functions into a waterfall,
+     * series, or other async functions. Any arguments passed to the generated
+     * function will be passed to the wrapped function (except for the final
+     * callback argument). Errors thrown will be passed to the callback.
+     *
+     * If the function passed to `asyncify` returns a Promise, that promises's
+     * resolved/rejected state will be used to call the callback, rather than simply
+     * the synchronous return value.
+     *
+     * This also means you can asyncify ES2017 `async` functions.
+     *
+     * @name asyncify
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @alias wrapSync
+     * @category Util
+     * @param {Function} func - The synchronous function, or Promise-returning
+     * function to convert to an {@link AsyncFunction}.
+     * @returns {AsyncFunction} An asynchronous wrapper of the `func`. To be
+     * invoked with `(args..., callback)`.
+     * @example
+     *
+     * // passing a regular synchronous function
+     * async.waterfall([
+     *     async.apply(fs.readFile, filename, "utf8"),
+     *     async.asyncify(JSON.parse),
+     *     function (data, next) {
+     *         // data is the result of parsing the text.
+     *         // If there was a parsing error, it would have been caught.
+     *     }
+     * ], callback);
+     *
+     * // passing a function returning a promise
+     * async.waterfall([
+     *     async.apply(fs.readFile, filename, "utf8"),
+     *     async.asyncify(function (contents) {
+     *         return db.model.create(contents);
+     *     }),
+     *     function (model, next) {
+     *         // `model` is the instantiated model object.
+     *         // If there was an error, this function would be skipped.
+     *     }
+     * ], callback);
+     *
+     * // es2017 example, though `asyncify` is not needed if your JS environment
+     * // supports async functions out of the box
+     * var q = async.queue(async.asyncify(async function(file) {
+     *     var intermediateStep = await processFile(file);
+     *     return await somePromise(intermediateStep)
+     * }));
+     *
+     * q.push(files);
+     */
+    function asyncify(func) {
+        if (isAsync(func)) {
+            return function (...args/*, callback*/) {
+                const callback = args.pop();
+                const promise = func.apply(this, args);
+                return handlePromise(promise, callback)
+            }
+        }
+
+        return initialParams(function (args, callback) {
+            var result;
+            try {
+                result = func.apply(this, args);
+            } catch (e) {
+                return callback(e);
+            }
+            // if result is Promise object
+            if (result && typeof result.then === 'function') {
+                return handlePromise(result, callback)
+            } else {
+                callback(null, result);
+            }
         });
-    };
-}
-
-var _defer;
-
-if (hasSetImmediate) {
-    _defer = setImmediate;
-} else if (hasNextTick) {
-    _defer = process.nextTick;
-} else {
-    _defer = fallback;
-}
-
-var setImmediate$1 = wrap(_defer);
-
-/**
- * Take a sync function and make it async, passing its return value to a
- * callback. This is useful for plugging sync functions into a waterfall,
- * series, or other async functions. Any arguments passed to the generated
- * function will be passed to the wrapped function (except for the final
- * callback argument). Errors thrown will be passed to the callback.
- *
- * If the function passed to `asyncify` returns a Promise, that promises's
- * resolved/rejected state will be used to call the callback, rather than simply
- * the synchronous return value.
- *
- * This also means you can asyncify ES2017 `async` functions.
- *
- * @name asyncify
- * @static
- * @memberOf module:Utils
- * @method
- * @alias wrapSync
- * @category Util
- * @param {Function} func - The synchronous function, or Promise-returning
- * function to convert to an {@link AsyncFunction}.
- * @returns {AsyncFunction} An asynchronous wrapper of the `func`. To be
- * invoked with `(args..., callback)`.
- * @example
- *
- * // passing a regular synchronous function
- * async.waterfall([
- *     async.apply(fs.readFile, filename, "utf8"),
- *     async.asyncify(JSON.parse),
- *     function (data, next) {
- *         // data is the result of parsing the text.
- *         // If there was a parsing error, it would have been caught.
- *     }
- * ], callback);
- *
- * // passing a function returning a promise
- * async.waterfall([
- *     async.apply(fs.readFile, filename, "utf8"),
- *     async.asyncify(function (contents) {
- *         return db.model.create(contents);
- *     }),
- *     function (model, next) {
- *         // `model` is the instantiated model object.
- *         // If there was an error, this function would be skipped.
- *     }
- * ], callback);
- *
- * // es2017 example, though `asyncify` is not needed if your JS environment
- * // supports async functions out of the box
- * var q = async.queue(async.asyncify(async function(file) {
- *     var intermediateStep = await processFile(file);
- *     return await somePromise(intermediateStep)
- * }));
- *
- * q.push(files);
- */
-function asyncify(func) {
-    return initialParams(function (args, callback) {
-        var result;
+    }
+
+    function handlePromise(promise, callback) {
+        return promise.then(value => {
+            invokeCallback(callback, null, value);
+        }, err => {
+            invokeCallback(callback, err && err.message ? err : new Error(err));
+        });
+    }
+
+    function invokeCallback(callback, error, value) {
         try {
-            result = func.apply(this, args);
-        } catch (e) {
-            return callback(e);
-        }
-        // if result is Promise object
-        if (isObject(result) && typeof result.then === 'function') {
-            result.then(function(value) {
-                invokeCallback(callback, null, value);
-            }, function(err) {
-                invokeCallback(callback, err.message ? err : new Error(err));
-            });
-        } else {
-            callback(null, result);
+            callback(error, value);
+        } catch (err) {
+            setImmediate$1(e => { throw e }, err);
         }
-    });
-}
-
-function invokeCallback(callback, error, value) {
-    try {
-        callback(error, value);
-    } catch (e) {
-        setImmediate$1(rethrow, e);
     }
-}
 
-function rethrow(error) {
-    throw error;
-}
+    function isAsync(fn) {
+        return fn[Symbol.toStringTag] === 'AsyncFunction';
+    }
+
+    function isAsyncGenerator(fn) {
+        return fn[Symbol.toStringTag] === 'AsyncGenerator';
+    }
+
+    function isAsyncIterable(obj) {
+        return typeof obj[Symbol.asyncIterator] === 'function';
+    }
 
-var supportsSymbol = typeof Symbol === 'function';
+    function wrapAsync(asyncFn) {
+        if (typeof asyncFn !== 'function') throw new Error('expected a function')
+        return isAsync(asyncFn) ? asyncify(asyncFn) : asyncFn;
+    }
 
-function isAsync(fn) {
-    return supportsSymbol && fn[Symbol.toStringTag] === 'AsyncFunction';
-}
+    function applyEach(eachfn) {
+        return function(fns, ...callArgs) {
+            var go = initialParams(function(args, callback) {
+                var that = this;
+                return eachfn(fns, (fn, cb) => {
+                    wrapAsync(fn).apply(that, args.concat(cb));
+                }, callback);
+            });
+            if (callArgs.length) {
+                return go.apply(this, callArgs);
+            }
+            return go;
+        };
+    }
 
-function wrapAsync(asyncFn) {
-    return isAsync(asyncFn) ? asyncify(asyncFn) : asyncFn;
-}
+    function _asyncMap(eachfn, arr, iteratee, callback) {
+        arr = arr || [];
+        var results = [];
+        var counter = 0;
+        var _iteratee = wrapAsync(iteratee);
 
-function applyEach$1(eachfn) {
-    return function(fns/*, ...args*/) {
-        var args = slice(arguments, 1);
-        var go = initialParams(function(args, callback) {
-            var that = this;
-            return eachfn(fns, function (fn, cb) {
-                wrapAsync(fn).apply(that, args.concat(cb));
-            }, callback);
+        return eachfn(arr, (value, _, iterCb) => {
+            var index = counter++;
+            _iteratee(value, (err, v) => {
+                results[index] = v;
+                iterCb(err);
+            });
+        }, err => {
+            callback(err, results);
         });
-        if (args.length) {
-            return go.apply(this, args);
-        }
-        else {
-            return go;
-        }
-    };
-}
-
-/** Detect free variable `global` from Node.js. */
-var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
-
-/** Detect free variable `self`. */
-var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
-
-/** Used as a reference to the global object. */
-var root = freeGlobal || freeSelf || Function('return this')();
-
-/** Built-in value references. */
-var Symbol$1 = root.Symbol;
-
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
-
-/** Used to check objects for own properties. */
-var hasOwnProperty = objectProto.hasOwnProperty;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var nativeObjectToString = objectProto.toString;
-
-/** Built-in value references. */
-var symToStringTag$1 = Symbol$1 ? Symbol$1.toStringTag : undefined;
-
-/**
- * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
- *
- * @private
- * @param {*} value The value to query.
- * @returns {string} Returns the raw `toStringTag`.
- */
-function getRawTag(value) {
-  var isOwn = hasOwnProperty.call(value, symToStringTag$1),
-      tag = value[symToStringTag$1];
-
-  try {
-    value[symToStringTag$1] = undefined;
-    var unmasked = true;
-  } catch (e) {}
-
-  var result = nativeObjectToString.call(value);
-  if (unmasked) {
-    if (isOwn) {
-      value[symToStringTag$1] = tag;
-    } else {
-      delete value[symToStringTag$1];
     }
-  }
-  return result;
-}
-
-/** Used for built-in method references. */
-var objectProto$1 = Object.prototype;
-
-/**
- * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
- * of values.
- */
-var nativeObjectToString$1 = objectProto$1.toString;
-
-/**
- * Converts `value` to a string using `Object.prototype.toString`.
- *
- * @private
- * @param {*} value The value to convert.
- * @returns {string} Returns the converted string.
- */
-function objectToString(value) {
-  return nativeObjectToString$1.call(value);
-}
-
-/** `Object#toString` result references. */
-var nullTag = '[object Null]';
-var undefinedTag = '[object Undefined]';
-
-/** Built-in value references. */
-var symToStringTag = Symbol$1 ? Symbol$1.toStringTag : undefined;
-
-/**
- * The base implementation of `getTag` without fallbacks for buggy environments.
- *
- * @private
- * @param {*} value The value to query.
- * @returns {string} Returns the `toStringTag`.
- */
-function baseGetTag(value) {
-  if (value == null) {
-    return value === undefined ? undefinedTag : nullTag;
-  }
-  return (symToStringTag && symToStringTag in Object(value))
-    ? getRawTag(value)
-    : objectToString(value);
-}
-
-/** `Object#toString` result references. */
-var asyncTag = '[object AsyncFunction]';
-var funcTag = '[object Function]';
-var genTag = '[object GeneratorFunction]';
-var proxyTag = '[object Proxy]';
-
-/**
- * Checks if `value` is classified as a `Function` object.
- *
- * @static
- * @memberOf _
- * @since 0.1.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a function, else `false`.
- * @example
- *
- * _.isFunction(_);
- * // => true
- *
- * _.isFunction(/abc/);
- * // => false
- */
-function isFunction(value) {
-  if (!isObject(value)) {
-    return false;
-  }
-  // The use of `Object#toString` avoids issues with the `typeof` operator
-  // in Safari 9 which returns 'object' for typed arrays and other constructors.
-  var tag = baseGetTag(value);
-  return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
-}
-
-/** Used as references for various `Number` constants. */
-var MAX_SAFE_INTEGER = 9007199254740991;
-
-/**
- * Checks if `value` is a valid array-like length.
- *
- * **Note:** This method is loosely based on
- * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
- * @example
- *
- * _.isLength(3);
- * // => true
- *
- * _.isLength(Number.MIN_VALUE);
- * // => false
- *
- * _.isLength(Infinity);
- * // => false
- *
- * _.isLength('3');
- * // => false
- */
-function isLength(value) {
-  return typeof value == 'number' &&
-    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
-}
-
-/**
- * Checks if `value` is array-like. A value is considered array-like if it's
- * not a function and has a `value.length` that's an integer greater than or
- * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
- * @example
- *
- * _.isArrayLike([1, 2, 3]);
- * // => true
- *
- * _.isArrayLike(document.body.children);
- * // => true
- *
- * _.isArrayLike('abc');
- * // => true
- *
- * _.isArrayLike(_.noop);
- * // => false
- */
-function isArrayLike(value) {
-  return value != null && isLength(value.length) && !isFunction(value);
-}
-
-// A temporary value used to identify if the loop should be broken.
-// See #1064, #1293
-var breakLoop = {};
-
-/**
- * This method returns `undefined`.
- *
- * @static
- * @memberOf _
- * @since 2.3.0
- * @category Util
- * @example
- *
- * _.times(2, _.noop);
- * // => [undefined, undefined]
- */
-function noop() {
-  // No operation performed.
-}
-
-function once(fn) {
-    return function () {
-        if (fn === null) return;
-        var callFn = fn;
-        fn = null;
-        callFn.apply(this, arguments);
-    };
-}
-
-var iteratorSymbol = typeof Symbol === 'function' && Symbol.iterator;
-
-var getIterator = function (coll) {
-    return iteratorSymbol && coll[iteratorSymbol] && coll[iteratorSymbol]();
-};
-
-/**
- * The base implementation of `_.times` without support for iteratee shorthands
- * or max array length checks.
- *
- * @private
- * @param {number} n The number of times to invoke `iteratee`.
- * @param {Function} iteratee The function invoked per iteration.
- * @returns {Array} Returns the array of results.
- */
-function baseTimes(n, iteratee) {
-  var index = -1,
-      result = Array(n);
-
-  while (++index < n) {
-    result[index] = iteratee(index);
-  }
-  return result;
-}
-
-/**
- * Checks if `value` is object-like. A value is object-like if it's not `null`
- * and has a `typeof` result of "object".
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
- * @example
- *
- * _.isObjectLike({});
- * // => true
- *
- * _.isObjectLike([1, 2, 3]);
- * // => true
- *
- * _.isObjectLike(_.noop);
- * // => false
- *
- * _.isObjectLike(null);
- * // => false
- */
-function isObjectLike(value) {
-  return value != null && typeof value == 'object';
-}
-
-/** `Object#toString` result references. */
-var argsTag = '[object Arguments]';
-
-/**
- * The base implementation of `_.isArguments`.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is an `arguments` object,
- */
-function baseIsArguments(value) {
-  return isObjectLike(value) && baseGetTag(value) == argsTag;
-}
-
-/** Used for built-in method references. */
-var objectProto$3 = Object.prototype;
-
-/** Used to check objects for own properties. */
-var hasOwnProperty$2 = objectProto$3.hasOwnProperty;
-
-/** Built-in value references. */
-var propertyIsEnumerable = objectProto$3.propertyIsEnumerable;
-
-/**
- * Checks if `value` is likely an `arguments` object.
- *
- * @static
- * @memberOf _
- * @since 0.1.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is an `arguments` object,
- *  else `false`.
- * @example
- *
- * _.isArguments(function() { return arguments; }());
- * // => true
- *
- * _.isArguments([1, 2, 3]);
- * // => false
- */
-var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
-  return isObjectLike(value) && hasOwnProperty$2.call(value, 'callee') &&
-    !propertyIsEnumerable.call(value, 'callee');
-};
-
-/**
- * Checks if `value` is classified as an `Array` object.
- *
- * @static
- * @memberOf _
- * @since 0.1.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is an array, else `false`.
- * @example
- *
- * _.isArray([1, 2, 3]);
- * // => true
- *
- * _.isArray(document.body.children);
- * // => false
- *
- * _.isArray('abc');
- * // => false
- *
- * _.isArray(_.noop);
- * // => false
- */
-var isArray = Array.isArray;
-
-/**
- * This method returns `false`.
- *
- * @static
- * @memberOf _
- * @since 4.13.0
- * @category Util
- * @returns {boolean} Returns `false`.
- * @example
- *
- * _.times(2, _.stubFalse);
- * // => [false, false]
- */
-function stubFalse() {
-  return false;
-}
-
-/** Detect free variable `exports`. */
-var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
-
-/** Detect free variable `module`. */
-var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
-
-/** Detect the popular CommonJS extension `module.exports`. */
-var moduleExports = freeModule && freeModule.exports === freeExports;
-
-/** Built-in value references. */
-var Buffer = moduleExports ? root.Buffer : undefined;
-
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined;
-
-/**
- * Checks if `value` is a buffer.
- *
- * @static
- * @memberOf _
- * @since 4.3.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
- * @example
- *
- * _.isBuffer(new Buffer(2));
- * // => true
- *
- * _.isBuffer(new Uint8Array(2));
- * // => false
- */
-var isBuffer = nativeIsBuffer || stubFalse;
-
-/** Used as references for various `Number` constants. */
-var MAX_SAFE_INTEGER$1 = 9007199254740991;
-
-/** Used to detect unsigned integer values. */
-var reIsUint = /^(?:0|[1-9]\d*)$/;
-
-/**
- * Checks if `value` is a valid array-like index.
- *
- * @private
- * @param {*} value The value to check.
- * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
- * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
- */
-function isIndex(value, length) {
-  var type = typeof value;
-  length = length == null ? MAX_SAFE_INTEGER$1 : length;
-
-  return !!length &&
-    (type == 'number' ||
-      (type != 'symbol' && reIsUint.test(value))) &&
-        (value > -1 && value % 1 == 0 && value < length);
-}
-
-/** `Object#toString` result references. */
-var argsTag$1 = '[object Arguments]';
-var arrayTag = '[object Array]';
-var boolTag = '[object Boolean]';
-var dateTag = '[object Date]';
-var errorTag = '[object Error]';
-var funcTag$1 = '[object Function]';
-var mapTag = '[object Map]';
-var numberTag = '[object Number]';
-var objectTag = '[object Object]';
-var regexpTag = '[object RegExp]';
-var setTag = '[object Set]';
-var stringTag = '[object String]';
-var weakMapTag = '[object WeakMap]';
-
-var arrayBufferTag = '[object ArrayBuffer]';
-var dataViewTag = '[object DataView]';
-var float32Tag = '[object Float32Array]';
-var float64Tag = '[object Float64Array]';
-var int8Tag = '[object Int8Array]';
-var int16Tag = '[object Int16Array]';
-var int32Tag = '[object Int32Array]';
-var uint8Tag = '[object Uint8Array]';
-var uint8ClampedTag = '[object Uint8ClampedArray]';
-var uint16Tag = '[object Uint16Array]';
-var uint32Tag = '[object Uint32Array]';
-
-/** Used to identify `toStringTag` values of typed arrays. */
-var typedArrayTags = {};
-typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
-typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
-typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
-typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
-typedArrayTags[uint32Tag] = true;
-typedArrayTags[argsTag$1] = typedArrayTags[arrayTag] =
-typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
-typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
-typedArrayTags[errorTag] = typedArrayTags[funcTag$1] =
-typedArrayTags[mapTag] = typedArrayTags[numberTag] =
-typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
-typedArrayTags[setTag] = typedArrayTags[stringTag] =
-typedArrayTags[weakMapTag] = false;
-
-/**
- * The base implementation of `_.isTypedArray` without Node.js optimizations.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
- */
-function baseIsTypedArray(value) {
-  return isObjectLike(value) &&
-    isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
-}
-
-/**
- * The base implementation of `_.unary` without support for storing metadata.
- *
- * @private
- * @param {Function} func The function to cap arguments for.
- * @returns {Function} Returns the new capped function.
- */
-function baseUnary(func) {
-  return function(value) {
-    return func(value);
-  };
-}
-
-/** Detect free variable `exports`. */
-var freeExports$1 = typeof exports == 'object' && exports && !exports.nodeType && exports;
-
-/** Detect free variable `module`. */
-var freeModule$1 = freeExports$1 && typeof module == 'object' && module && !module.nodeType && module;
-
-/** Detect the popular CommonJS extension `module.exports`. */
-var moduleExports$1 = freeModule$1 && freeModule$1.exports === freeExports$1;
-
-/** Detect free variable `process` from Node.js. */
-var freeProcess = moduleExports$1 && freeGlobal.process;
-
-/** Used to access faster Node.js helpers. */
-var nodeUtil = (function() {
-  try {
-    // Use `util.types` for Node.js 10+.
-    var types = freeModule$1 && freeModule$1.require && freeModule$1.require('util').types;
-
-    if (types) {
-      return types;
+
+    function isArrayLike(value) {
+        return value &&
+            typeof value.length === 'number' &&
+            value.length >= 0 &&
+            value.length % 1 === 0;
     }
 
-    // Legacy `process.binding('util')` for Node.js < 10.
-    return freeProcess && freeProcess.binding && freeProcess.binding('util');
-  } catch (e) {}
-}());
-
-/* Node.js helper references. */
-var nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
-
-/**
- * Checks if `value` is classified as a typed array.
- *
- * @static
- * @memberOf _
- * @since 3.0.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
- * @example
- *
- * _.isTypedArray(new Uint8Array);
- * // => true
- *
- * _.isTypedArray([]);
- * // => false
- */
-var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
-
-/** Used for built-in method references. */
-var objectProto$2 = Object.prototype;
-
-/** Used to check objects for own properties. */
-var hasOwnProperty$1 = objectProto$2.hasOwnProperty;
-
-/**
- * Creates an array of the enumerable property names of the array-like `value`.
- *
- * @private
- * @param {*} value The value to query.
- * @param {boolean} inherited Specify returning inherited property names.
- * @returns {Array} Returns the array of property names.
- */
-function arrayLikeKeys(value, inherited) {
-  var isArr = isArray(value),
-      isArg = !isArr && isArguments(value),
-      isBuff = !isArr && !isArg && isBuffer(value),
-      isType = !isArr && !isArg && !isBuff && isTypedArray(value),
-      skipIndexes = isArr || isArg || isBuff || isType,
-      result = skipIndexes ? baseTimes(value.length, String) : [],
-      length = result.length;
-
-  for (var key in value) {
-    if ((inherited || hasOwnProperty$1.call(value, key)) &&
-        !(skipIndexes && (
-           // Safari 9 has enumerable `arguments.length` in strict mode.
-           key == 'length' ||
-           // Node.js 0.10 has enumerable non-index properties on buffers.
-           (isBuff && (key == 'offset' || key == 'parent')) ||
-           // PhantomJS 2 has enumerable non-index properties on typed arrays.
-           (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
-           // Skip index properties.
-           isIndex(key, length)
-        ))) {
-      result.push(key);
+    // A temporary value used to identify if the loop should be broken.
+    // See #1064, #1293
+    const breakLoop = {};
+
+    function once(fn) {
+        function wrapper (...args) {
+            if (fn === null) return;
+            var callFn = fn;
+            fn = null;
+            callFn.apply(this, args);
+        }
+        Object.assign(wrapper, fn);
+        return wrapper
     }
-  }
-  return result;
-}
-
-/** Used for built-in method references. */
-var objectProto$5 = Object.prototype;
-
-/**
- * Checks if `value` is likely a prototype object.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
- */
-function isPrototype(value) {
-  var Ctor = value && value.constructor,
-      proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$5;
-
-  return value === proto;
-}
-
-/**
- * Creates a unary function that invokes `func` with its argument transformed.
- *
- * @private
- * @param {Function} func The function to wrap.
- * @param {Function} transform The argument transform.
- * @returns {Function} Returns the new function.
- */
-function overArg(func, transform) {
-  return function(arg) {
-    return func(transform(arg));
-  };
-}
-
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeKeys = overArg(Object.keys, Object);
-
-/** Used for built-in method references. */
-var objectProto$4 = Object.prototype;
-
-/** Used to check objects for own properties. */
-var hasOwnProperty$3 = objectProto$4.hasOwnProperty;
-
-/**
- * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
- *
- * @private
- * @param {Object} object The object to query.
- * @returns {Array} Returns the array of property names.
- */
-function baseKeys(object) {
-  if (!isPrototype(object)) {
-    return nativeKeys(object);
-  }
-  var result = [];
-  for (var key in Object(object)) {
-    if (hasOwnProperty$3.call(object, key) && key != 'constructor') {
-      result.push(key);
+
+    function getIterator (coll) {
+        return coll[Symbol.iterator] && coll[Symbol.iterator]();
     }
-  }
-  return result;
-}
-
-/**
- * Creates an array of the own enumerable property names of `object`.
- *
- * **Note:** Non-object values are coerced to objects. See the
- * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
- * for more details.
- *
- * @static
- * @since 0.1.0
- * @memberOf _
- * @category Object
- * @param {Object} object The object to query.
- * @returns {Array} Returns the array of property names.
- * @example
- *
- * function Foo() {
- *   this.a = 1;
- *   this.b = 2;
- * }
- *
- * Foo.prototype.c = 3;
- *
- * _.keys(new Foo);
- * // => ['a', 'b'] (iteration order is not guaranteed)
- *
- * _.keys('hi');
- * // => ['0', '1']
- */
-function keys(object) {
-  return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
-}
-
-function createArrayIterator(coll) {
-    var i = -1;
-    var len = coll.length;
-    return function next() {
-        return ++i < len ? {value: coll[i], key: i} : null;
+
+    function createArrayIterator(coll) {
+        var i = -1;
+        var len = coll.length;
+        return function next() {
+            return ++i < len ? {value: coll[i], key: i} : null;
+        }
     }
-}
-
-function createES2015Iterator(iterator) {
-    var i = -1;
-    return function next() {
-        var item = iterator.next();
-        if (item.done)
-            return null;
-        i++;
-        return {value: item.value, key: i};
+
+    function createES2015Iterator(iterator) {
+        var i = -1;
+        return function next() {
+            var item = iterator.next();
+            if (item.done)
+                return null;
+            i++;
+            return {value: item.value, key: i};
+        }
     }
-}
-
-function createObjectIterator(obj) {
-    var okeys = keys(obj);
-    var i = -1;
-    var len = okeys.length;
-    return function next() {
-        var key = okeys[++i];
-        return i < len ? {value: obj[key], key: key} : null;
-    };
-}
 
-function iterator(coll) {
-    if (isArrayLike(coll)) {
-        return createArrayIterator(coll);
+    function createObjectIterator(obj) {
+        var okeys = obj ? Object.keys(obj) : [];
+        var i = -1;
+        var len = okeys.length;
+        return function next() {
+            var key = okeys[++i];
+            return i < len ? {value: obj[key], key} : null;
+        };
     }
 
-    var iterator = getIterator(coll);
-    return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll);
-}
+    function createIterator(coll) {
+        if (isArrayLike(coll)) {
+            return createArrayIterator(coll);
+        }
 
-function onlyOnce(fn) {
-    return function() {
-        if (fn === null) throw new Error("Callback was already called.");
-        var callFn = fn;
-        fn = null;
-        callFn.apply(this, arguments);
-    };
-}
+        var iterator = getIterator(coll);
+        return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll);
+    }
 
-function _eachOfLimit(limit) {
-    return function (obj, iteratee, callback) {
-        callback = once(callback || noop);
-        if (limit <= 0 || !obj) {
-            return callback(null);
+    function onlyOnce(fn) {
+        return function (...args) {
+            if (fn === null) throw new Error("Callback was already called.");
+            var callFn = fn;
+            fn = null;
+            callFn.apply(this, args);
+        };
+    }
+
+    // for async generators
+    function asyncEachOfLimit(generator, limit, iteratee, callback) {
+        let done = false;
+        let canceled = false;
+        let awaiting = false;
+        let running = 0;
+        let idx = 0;
+
+        function replenish() {
+            //console.log('replenish')
+            if (running >= limit || awaiting || done) return
+            //console.log('replenish awaiting')
+            awaiting = true;
+            generator.next().then(({value, done: iterDone}) => {
+                //console.log('got value', value)
+                if (canceled || done) return
+                awaiting = false;
+                if (iterDone) {
+                    done = true;
+                    if (running <= 0) {
+                        //console.log('done nextCb')
+                        callback(null);
+                    }
+                    return;
+                }
+                running++;
+                iteratee(value, idx, iterateeCallback);
+                idx++;
+                replenish();
+            }).catch(handleError);
         }
-        var nextElem = iterator(obj);
-        var done = false;
-        var running = 0;
-        var looping = false;
 
-        function iterateeCallback(err, value) {
+        function iterateeCallback(err, result) {
+            //console.log('iterateeCallback')
             running -= 1;
-            if (err) {
+            if (canceled) return
+            if (err) return handleError(err)
+
+            if (err === false) {
                 done = true;
-                callback(err);
+                canceled = true;
+                return
             }
-            else if (value === breakLoop || (done && running <= 0)) {
+
+            if (result === breakLoop || (done && running <= 0)) {
                 done = true;
+                //console.log('done iterCb')
                 return callback(null);
             }
-            else if (!looping) {
-                replenish();
-            }
+            replenish();
         }
 
-        function replenish () {
-            looping = true;
-            while (running < limit && !done) {
-                var elem = nextElem();
-                if (elem === null) {
+        function handleError(err) {
+            if (canceled) return
+            awaiting = false;
+            done = true;
+            callback(err);
+        }
+
+        replenish();
+    }
+
+    var eachOfLimit = (limit) => {
+        return (obj, iteratee, callback) => {
+            callback = once(callback);
+            if (limit <= 0) {
+                throw new RangeError('concurrency limit cannot be less than 1')
+            }
+            if (!obj) {
+                return callback(null);
+            }
+            if (isAsyncGenerator(obj)) {
+                return asyncEachOfLimit(obj, limit, iteratee, callback)
+            }
+            if (isAsyncIterable(obj)) {
+                return asyncEachOfLimit(obj[Symbol.asyncIterator](), limit, iteratee, callback)
+            }
+            var nextElem = createIterator(obj);
+            var done = false;
+            var canceled = false;
+            var running = 0;
+            var looping = false;
+
+            function iterateeCallback(err, value) {
+                if (canceled) return
+                running -= 1;
+                if (err) {
                     done = true;
-                    if (running <= 0) {
-                        callback(null);
+                    callback(err);
+                }
+                else if (err === false) {
+                    done = true;
+                    canceled = true;
+                }
+                else if (value === breakLoop || (done && running <= 0)) {
+                    done = true;
+                    return callback(null);
+                }
+                else if (!looping) {
+                    replenish();
+                }
+            }
+
+            function replenish () {
+                looping = true;
+                while (running < limit && !done) {
+                    var elem = nextElem();
+                    if (elem === null) {
+                        done = true;
+                        if (running <= 0) {
+                            callback(null);
+                        }
+                        return;
                     }
-                    return;
+                    running += 1;
+                    iteratee(elem.value, elem.key, onlyOnce(iterateeCallback));
                 }
-                running += 1;
-                iteratee(elem.value, elem.key, onlyOnce(iterateeCallback));
+                looping = false;
             }
-            looping = false;
-        }
 
-        replenish();
-    };
-}
-
-/**
- * The same as [`eachOf`]{@link module:Collections.eachOf} but runs a maximum of `limit` async operations at a
- * time.
- *
- * @name eachOfLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.eachOf]{@link module:Collections.eachOf}
- * @alias forEachOfLimit
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - An async function to apply to each
- * item in `coll`. The `key` is the item's key, or index in the case of an
- * array.
- * Invoked with (item, key, callback).
- * @param {Function} [callback] - A callback which is called when all
- * `iteratee` functions have finished, or an error occurs. Invoked with (err).
- */
-function eachOfLimit(coll, limit, iteratee, callback) {
-    _eachOfLimit(limit)(coll, wrapAsync(iteratee), callback);
-}
-
-function doLimit(fn, limit) {
-    return function (iterable, iteratee, callback) {
-        return fn(iterable, limit, iteratee, callback);
+            replenish();
+        };
     };
-}
-
-// eachOf implementation optimized for array-likes
-function eachOfArrayLike(coll, iteratee, callback) {
-    callback = once(callback || noop);
-    var index = 0,
-        completed = 0,
-        length = coll.length;
-    if (length === 0) {
-        callback(null);
-    }
 
-    function iteratorCallback(err, value) {
-        if (err) {
-            callback(err);
-        } else if ((++completed === length) || value === breakLoop) {
-            callback(null);
+    // conditionally promisify a function.
+    // only return a promise if a callback is omitted
+    function awaitify (asyncFn, arity = asyncFn.length) {
+        if (!arity) throw new Error('arity is undefined')
+        function awaitable (...args) {
+            if (typeof args[arity - 1] === 'function') {
+                return asyncFn.apply(this, args)
+            }
+
+            return new Promise((resolve, reject) => {
+                args[arity - 1] = (err, ...cbArgs) => {
+                    if (err) return reject(err)
+                    resolve(cbArgs.length > 1 ? cbArgs : cbArgs[0]);
+                };
+                asyncFn.apply(this, args);
+            })
         }
+
+        Object.defineProperty(awaitable, 'name', {
+            value: `awaitable(${asyncFn.name})`
+        });
+
+        return awaitable
     }
 
-    for (; index < length; index++) {
-        iteratee(coll[index], index, onlyOnce(iteratorCallback));
+    /**
+     * The same as [`eachOf`]{@link module:Collections.eachOf} but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name eachOfLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.eachOf]{@link module:Collections.eachOf}
+     * @alias forEachOfLimit
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - An async function to apply to each
+     * item in `coll`. The `key` is the item's key, or index in the case of an
+     * array.
+     * Invoked with (item, key, callback).
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     * @returns {Promise} a promise, if a callback is omitted
+     */
+    function eachOfLimit$1(coll, limit, iteratee, callback) {
+        return eachOfLimit(limit)(coll, wrapAsync(iteratee), callback);
     }
-}
-
-// a generic version of eachOf which can handle array, object, and iterator cases.
-var eachOfGeneric = doLimit(eachOfLimit, Infinity);
-
-/**
- * Like [`each`]{@link module:Collections.each}, except that it passes the key (or index) as the second argument
- * to the iteratee.
- *
- * @name eachOf
- * @static
- * @memberOf module:Collections
- * @method
- * @alias forEachOf
- * @category Collection
- * @see [async.each]{@link module:Collections.each}
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - A function to apply to each
- * item in `coll`.
- * The `key` is the item's key, or index in the case of an array.
- * Invoked with (item, key, callback).
- * @param {Function} [callback] - A callback which is called when all
- * `iteratee` functions have finished, or an error occurs. Invoked with (err).
- * @example
- *
- * var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"};
- * var configs = {};
- *
- * async.forEachOf(obj, function (value, key, callback) {
- *     fs.readFile(__dirname + value, "utf8", function (err, data) {
- *         if (err) return callback(err);
- *         try {
- *             configs[key] = JSON.parse(data);
- *         } catch (e) {
- *             return callback(e);
- *         }
- *         callback();
- *     });
- * }, function (err) {
- *     if (err) console.error(err.message);
- *     // configs is now a map of JSON data
- *     doSomethingWith(configs);
- * });
- */
-var eachOf = function(coll, iteratee, callback) {
-    var eachOfImplementation = isArrayLike(coll) ? eachOfArrayLike : eachOfGeneric;
-    eachOfImplementation(coll, wrapAsync(iteratee), callback);
-};
-
-function doParallel(fn) {
-    return function (obj, iteratee, callback) {
-        return fn(eachOf, obj, wrapAsync(iteratee), callback);
-    };
-}
-
-function _asyncMap(eachfn, arr, iteratee, callback) {
-    callback = callback || noop;
-    arr = arr || [];
-    var results = [];
-    var counter = 0;
-    var _iteratee = wrapAsync(iteratee);
-
-    eachfn(arr, function (value, _, callback) {
-        var index = counter++;
-        _iteratee(value, function (err, v) {
-            results[index] = v;
-            callback(err);
-        });
-    }, function (err) {
-        callback(err, results);
-    });
-}
-
-/**
- * Produces a new collection of values by mapping each value in `coll` through
- * the `iteratee` function. The `iteratee` is called with an item from `coll`
- * and a callback for when it has finished processing. Each of these callback
- * takes 2 arguments: an `error`, and the transformed item from `coll`. If
- * `iteratee` passes an error to its callback, the main `callback` (for the
- * `map` function) is immediately called with the error.
- *
- * Note, that since this function applies the `iteratee` to each item in
- * parallel, there is no guarantee that the `iteratee` functions will complete
- * in order. However, the results array will be in the same order as the
- * original `coll`.
- *
- * If `map` is passed an Object, the results will be an Array.  The results
- * will roughly be in the order of the original Objects' keys (but this can
- * vary across JavaScript engines).
- *
- * @name map
- * @static
- * @memberOf module:Collections
- * @method
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The iteratee should complete with the transformed item.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Results is an Array of the
- * transformed items from the `coll`. Invoked with (err, results).
- * @example
- *
- * async.map(['file1','file2','file3'], fs.stat, function(err, results) {
- *     // results is now an array of stats for each file
- * });
- */
-var map = doParallel(_asyncMap);
-
-/**
- * Applies the provided arguments to each function in the array, calling
- * `callback` after all functions have completed. If you only provide the first
- * argument, `fns`, then it will return a function which lets you pass in the
- * arguments as if it were a single function call. If more arguments are
- * provided, `callback` is required while `args` is still optional.
- *
- * @name applyEach
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Array|Iterable|Object} fns - A collection of {@link AsyncFunction}s
- * to all call with the same arguments
- * @param {...*} [args] - any number of separate arguments to pass to the
- * function.
- * @param {Function} [callback] - the final argument should be the callback,
- * called when all functions have completed processing.
- * @returns {Function} - If only the first argument, `fns`, is provided, it will
- * return a function which lets you pass in the arguments as if it were a single
- * function call. The signature is `(..args, callback)`. If invoked with any
- * arguments, `callback` is required.
- * @example
- *
- * async.applyEach([enableSearch, updateSchema], 'bucket', callback);
- *
- * // partial application example:
- * async.each(
- *     buckets,
- *     async.applyEach([enableSearch, updateSchema]),
- *     callback
- * );
- */
-var applyEach = applyEach$1(map);
-
-function doParallelLimit(fn) {
-    return function (obj, limit, iteratee, callback) {
-        return fn(_eachOfLimit(limit), obj, wrapAsync(iteratee), callback);
-    };
-}
-
-/**
- * The same as [`map`]{@link module:Collections.map} but runs a maximum of `limit` async operations at a time.
- *
- * @name mapLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.map]{@link module:Collections.map}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The iteratee should complete with the transformed item.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Results is an array of the
- * transformed items from the `coll`. Invoked with (err, results).
- */
-var mapLimit = doParallelLimit(_asyncMap);
-
-/**
- * The same as [`map`]{@link module:Collections.map} but runs only a single async operation at a time.
- *
- * @name mapSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.map]{@link module:Collections.map}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The iteratee should complete with the transformed item.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Results is an array of the
- * transformed items from the `coll`. Invoked with (err, results).
- */
-var mapSeries = doLimit(mapLimit, 1);
-
-/**
- * The same as [`applyEach`]{@link module:ControlFlow.applyEach} but runs only a single async operation at a time.
- *
- * @name applyEachSeries
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.applyEach]{@link module:ControlFlow.applyEach}
- * @category Control Flow
- * @param {Array|Iterable|Object} fns - A collection of {@link AsyncFunction}s to all
- * call with the same arguments
- * @param {...*} [args] - any number of separate arguments to pass to the
- * function.
- * @param {Function} [callback] - the final argument should be the callback,
- * called when all functions have completed processing.
- * @returns {Function} - If only the first argument is provided, it will return
- * a function which lets you pass in the arguments as if it were a single
- * function call.
- */
-var applyEachSeries = applyEach$1(mapSeries);
-
-/**
- * A specialized version of `_.forEach` for arrays without support for
- * iteratee shorthands.
- *
- * @private
- * @param {Array} [array] The array to iterate over.
- * @param {Function} iteratee The function invoked per iteration.
- * @returns {Array} Returns `array`.
- */
-function arrayEach(array, iteratee) {
-  var index = -1,
-      length = array == null ? 0 : array.length;
-
-  while (++index < length) {
-    if (iteratee(array[index], index, array) === false) {
-      break;
+
+    var eachOfLimit$2 = awaitify(eachOfLimit$1, 4);
+
+    // eachOf implementation optimized for array-likes
+    function eachOfArrayLike(coll, iteratee, callback) {
+        callback = once(callback);
+        var index = 0,
+            completed = 0,
+            {length} = coll,
+            canceled = false;
+        if (length === 0) {
+            callback(null);
+        }
+
+        function iteratorCallback(err, value) {
+            if (err === false) {
+                canceled = true;
+            }
+            if (canceled === true) return
+            if (err) {
+                callback(err);
+            } else if ((++completed === length) || value === breakLoop) {
+                callback(null);
+            }
+        }
+
+        for (; index < length; index++) {
+            iteratee(coll[index], index, onlyOnce(iteratorCallback));
+        }
     }
-  }
-  return array;
-}
-
-/**
- * Creates a base function for methods like `_.forIn` and `_.forOwn`.
- *
- * @private
- * @param {boolean} [fromRight] Specify iterating from right to left.
- * @returns {Function} Returns the new base function.
- */
-function createBaseFor(fromRight) {
-  return function(object, iteratee, keysFunc) {
-    var index = -1,
-        iterable = Object(object),
-        props = keysFunc(object),
-        length = props.length;
-
-    while (length--) {
-      var key = props[fromRight ? length : ++index];
-      if (iteratee(iterable[key], key, iterable) === false) {
-        break;
-      }
+
+    // a generic version of eachOf which can handle array, object, and iterator cases.
+    function eachOfGeneric (coll, iteratee, callback) {
+        return eachOfLimit$2(coll, Infinity, iteratee, callback);
     }
-    return object;
-  };
-}
-
-/**
- * The base implementation of `baseForOwn` which iterates over `object`
- * properties returned by `keysFunc` and invokes `iteratee` for each property.
- * Iteratee functions may exit iteration early by explicitly returning `false`.
- *
- * @private
- * @param {Object} object The object to iterate over.
- * @param {Function} iteratee The function invoked per iteration.
- * @param {Function} keysFunc The function to get the keys of `object`.
- * @returns {Object} Returns `object`.
- */
-var baseFor = createBaseFor();
-
-/**
- * The base implementation of `_.forOwn` without support for iteratee shorthands.
- *
- * @private
- * @param {Object} object The object to iterate over.
- * @param {Function} iteratee The function invoked per iteration.
- * @returns {Object} Returns `object`.
- */
-function baseForOwn(object, iteratee) {
-  return object && baseFor(object, iteratee, keys);
-}
-
-/**
- * The base implementation of `_.findIndex` and `_.findLastIndex` without
- * support for iteratee shorthands.
- *
- * @private
- * @param {Array} array The array to inspect.
- * @param {Function} predicate The function invoked per iteration.
- * @param {number} fromIndex The index to search from.
- * @param {boolean} [fromRight] Specify iterating from right to left.
- * @returns {number} Returns the index of the matched value, else `-1`.
- */
-function baseFindIndex(array, predicate, fromIndex, fromRight) {
-  var length = array.length,
-      index = fromIndex + (fromRight ? 1 : -1);
-
-  while ((fromRight ? index-- : ++index < length)) {
-    if (predicate(array[index], index, array)) {
-      return index;
+
+    /**
+     * Like [`each`]{@link module:Collections.each}, except that it passes the key (or index) as the second argument
+     * to the iteratee.
+     *
+     * @name eachOf
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @alias forEachOf
+     * @category Collection
+     * @see [async.each]{@link module:Collections.each}
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - A function to apply to each
+     * item in `coll`.
+     * The `key` is the item's key, or index in the case of an array.
+     * Invoked with (item, key, callback).
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     * @returns {Promise} a promise, if a callback is omitted
+     * @example
+     *
+     * var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"};
+     * var configs = {};
+     *
+     * async.forEachOf(obj, function (value, key, callback) {
+     *     fs.readFile(__dirname + value, "utf8", function (err, data) {
+     *         if (err) return callback(err);
+     *         try {
+     *             configs[key] = JSON.parse(data);
+     *         } catch (e) {
+     *             return callback(e);
+     *         }
+     *         callback();
+     *     });
+     * }, function (err) {
+     *     if (err) console.error(err.message);
+     *     // configs is now a map of JSON data
+     *     doSomethingWith(configs);
+     * });
+     */
+    function eachOf(coll, iteratee, callback) {
+        var eachOfImplementation = isArrayLike(coll) ? eachOfArrayLike : eachOfGeneric;
+        return eachOfImplementation(coll, wrapAsync(iteratee), callback);
     }
-  }
-  return -1;
-}
-
-/**
- * The base implementation of `_.isNaN` without support for number objects.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
- */
-function baseIsNaN(value) {
-  return value !== value;
-}
-
-/**
- * A specialized version of `_.indexOf` which performs strict equality
- * comparisons of values, i.e. `===`.
- *
- * @private
- * @param {Array} array The array to inspect.
- * @param {*} value The value to search for.
- * @param {number} fromIndex The index to search from.
- * @returns {number} Returns the index of the matched value, else `-1`.
- */
-function strictIndexOf(array, value, fromIndex) {
-  var index = fromIndex - 1,
-      length = array.length;
-
-  while (++index < length) {
-    if (array[index] === value) {
-      return index;
+
+    var eachOf$1 = awaitify(eachOf, 3);
+
+    /**
+     * Produces a new collection of values by mapping each value in `coll` through
+     * the `iteratee` function. The `iteratee` is called with an item from `coll`
+     * and a callback for when it has finished processing. Each of these callback
+     * takes 2 arguments: an `error`, and the transformed item from `coll`. If
+     * `iteratee` passes an error to its callback, the main `callback` (for the
+     * `map` function) is immediately called with the error.
+     *
+     * Note, that since this function applies the `iteratee` to each item in
+     * parallel, there is no guarantee that the `iteratee` functions will complete
+     * in order. However, the results array will be in the same order as the
+     * original `coll`.
+     *
+     * If `map` is passed an Object, the results will be an Array.  The results
+     * will roughly be in the order of the original Objects' keys (but this can
+     * vary across JavaScript engines).
+     *
+     * @name map
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The iteratee should complete with the transformed item.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Results is an Array of the
+     * transformed items from the `coll`. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     *
+     * async.map(['file1','file2','file3'], fs.stat, function(err, results) {
+     *     // results is now an array of stats for each file
+     * });
+     */
+    function map (coll, iteratee, callback) {
+        return _asyncMap(eachOf$1, coll, iteratee, callback)
     }
-  }
-  return -1;
-}
-
-/**
- * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
- *
- * @private
- * @param {Array} array The array to inspect.
- * @param {*} value The value to search for.
- * @param {number} fromIndex The index to search from.
- * @returns {number} Returns the index of the matched value, else `-1`.
- */
-function baseIndexOf(array, value, fromIndex) {
-  return value === value
-    ? strictIndexOf(array, value, fromIndex)
-    : baseFindIndex(array, baseIsNaN, fromIndex);
-}
-
-/**
- * Determines the best order for running the {@link AsyncFunction}s in `tasks`, based on
- * their requirements. Each function can optionally depend on other functions
- * being completed first, and each function is run as soon as its requirements
- * are satisfied.
- *
- * If any of the {@link AsyncFunction}s pass an error to their callback, the `auto` sequence
- * will stop. Further tasks will not execute (so any other functions depending
- * on it will not run), and the main `callback` is immediately called with the
- * error.
- *
- * {@link AsyncFunction}s also receive an object containing the results of functions which
- * have completed so far as the first argument, if they have dependencies. If a
- * task function has no dependencies, it will only be passed a callback.
- *
- * @name auto
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Object} tasks - An object. Each of its properties is either a
- * function or an array of requirements, with the {@link AsyncFunction} itself the last item
- * in the array. The object's key of a property serves as the name of the task
- * defined by that property, i.e. can be used when specifying requirements for
- * other tasks. The function receives one or two arguments:
- * * a `results` object, containing the results of the previously executed
- *   functions, only passed if the task has any dependencies,
- * * a `callback(err, result)` function, which must be called when finished,
- *   passing an `error` (which can be `null`) and the result of the function's
- *   execution.
- * @param {number} [concurrency=Infinity] - An optional `integer` for
- * determining the maximum number of tasks that can be run in parallel. By
- * default, as many as possible.
- * @param {Function} [callback] - An optional callback which is called when all
- * the tasks have been completed. It receives the `err` argument if any `tasks`
- * pass an error to their callback. Results are always returned; however, if an
- * error occurs, no further `tasks` will be performed, and the results object
- * will only contain partial results. Invoked with (err, results).
- * @returns undefined
- * @example
- *
- * async.auto({
- *     // this function will just be passed a callback
- *     readData: async.apply(fs.readFile, 'data.txt', 'utf-8'),
- *     showData: ['readData', function(results, cb) {
- *         // results.readData is the file's contents
- *         // ...
- *     }]
- * }, callback);
- *
- * async.auto({
- *     get_data: function(callback) {
- *         console.log('in get_data');
- *         // async code to get some data
- *         callback(null, 'data', 'converted to array');
- *     },
- *     make_folder: function(callback) {
- *         console.log('in make_folder');
- *         // async code to create a directory to store a file in
- *         // this is run at the same time as getting the data
- *         callback(null, 'folder');
- *     },
- *     write_file: ['get_data', 'make_folder', function(results, callback) {
- *         console.log('in write_file', JSON.stringify(results));
- *         // once there is some data and the directory exists,
- *         // write the data to a file in the directory
- *         callback(null, 'filename');
- *     }],
- *     email_link: ['write_file', function(results, callback) {
- *         console.log('in email_link', JSON.stringify(results));
- *         // once the file is written let's email a link to it...
- *         // results.write_file contains the filename returned by write_file.
- *         callback(null, {'file':results.write_file, 'email':'user@example.com'});
- *     }]
- * }, function(err, results) {
- *     console.log('err = ', err);
- *     console.log('results = ', results);
- * });
- */
-var auto = function (tasks, concurrency, callback) {
-    if (typeof concurrency === 'function') {
-        // concurrency is optional, shift the args.
-        callback = concurrency;
-        concurrency = null;
+    var map$1 = awaitify(map, 3);
+
+    /**
+     * Applies the provided arguments to each function in the array, calling
+     * `callback` after all functions have completed. If you only provide the first
+     * argument, `fns`, then it will return a function which lets you pass in the
+     * arguments as if it were a single function call. If more arguments are
+     * provided, `callback` is required while `args` is still optional. The results
+     * for each of the applied async functions are passed to the final callback
+     * as an array.
+     *
+     * @name applyEach
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {Array|Iterable|AsyncIterable|Object} fns - A collection of {@link AsyncFunction}s
+     * to all call with the same arguments
+     * @param {...*} [args] - any number of separate arguments to pass to the
+     * function.
+     * @param {Function} [callback] - the final argument should be the callback,
+     * called when all functions have completed processing.
+     * @returns {Function} - If only the first argument, `fns`, is provided, it will
+     * return a function which lets you pass in the arguments as if it were a single
+     * function call. The signature is `(..args, callback)`. If invoked with any
+     * arguments, `callback` is required.
+     * @example
+     *
+     * async.applyEach([enableSearch, updateSchema], 'bucket', (err, results) => {
+     *     // results[0] is the results for `enableSearch`
+     *     // results[1] is the results for `updateSchema`
+     * });
+     *
+     * // partial application example:
+     * async.each(
+     *     buckets,
+     *     async.applyEach([enableSearch, updateSchema]),
+     *     callback
+     * );
+     */
+    var applyEach$1 = applyEach(map$1);
+
+    /**
+     * The same as [`eachOf`]{@link module:Collections.eachOf} but runs only a single async operation at a time.
+     *
+     * @name eachOfSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.eachOf]{@link module:Collections.eachOf}
+     * @alias forEachOfSeries
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * Invoked with (item, key, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Invoked with (err).
+     * @returns {Promise} a promise, if a callback is omitted
+     */
+    function eachOfSeries(coll, iteratee, callback) {
+        return eachOfLimit$2(coll, 1, iteratee, callback)
     }
-    callback = once(callback || noop);
-    var keys$$1 = keys(tasks);
-    var numTasks = keys$$1.length;
-    if (!numTasks) {
-        return callback(null);
+    var eachOfSeries$1 = awaitify(eachOfSeries, 3);
+
+    /**
+     * The same as [`map`]{@link module:Collections.map} but runs only a single async operation at a time.
+     *
+     * @name mapSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.map]{@link module:Collections.map}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The iteratee should complete with the transformed item.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Results is an array of the
+     * transformed items from the `coll`. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function mapSeries (coll, iteratee, callback) {
+        return _asyncMap(eachOfSeries$1, coll, iteratee, callback)
     }
-    if (!concurrency) {
-        concurrency = numTasks;
+    var mapSeries$1 = awaitify(mapSeries, 3);
+
+    /**
+     * The same as [`applyEach`]{@link module:ControlFlow.applyEach} but runs only a single async operation at a time.
+     *
+     * @name applyEachSeries
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.applyEach]{@link module:ControlFlow.applyEach}
+     * @category Control Flow
+     * @param {Array|Iterable|AsyncIterable|Object} fns - A collection of {@link AsyncFunction}s to all
+     * call with the same arguments
+     * @param {...*} [args] - any number of separate arguments to pass to the
+     * function.
+     * @param {Function} [callback] - the final argument should be the callback,
+     * called when all functions have completed processing.
+     * @returns {Function} - If only the first argument is provided, it will return
+     * a function which lets you pass in the arguments as if it were a single
+     * function call.
+     */
+    var applyEachSeries = applyEach(mapSeries$1);
+
+    const PROMISE_SYMBOL = Symbol('promiseCallback');
+
+    function promiseCallback () {
+        let resolve, reject;
+        function callback (err, ...args) {
+            if (err) return reject(err)
+            resolve(args.length > 1 ? args : args[0]);
+        }
+
+        callback[PROMISE_SYMBOL] = new Promise((res, rej) => {
+            resolve = res,
+            reject = rej;
+        });
+
+        return callback
     }
 
-    var results = {};
-    var runningTasks = 0;
-    var hasError = false;
+    /**
+     * Determines the best order for running the {@link AsyncFunction}s in `tasks`, based on
+     * their requirements. Each function can optionally depend on other functions
+     * being completed first, and each function is run as soon as its requirements
+     * are satisfied.
+     *
+     * If any of the {@link AsyncFunction}s pass an error to their callback, the `auto` sequence
+     * will stop. Further tasks will not execute (so any other functions depending
+     * on it will not run), and the main `callback` is immediately called with the
+     * error.
+     *
+     * {@link AsyncFunction}s also receive an object containing the results of functions which
+     * have completed so far as the first argument, if they have dependencies. If a
+     * task function has no dependencies, it will only be passed a callback.
+     *
+     * @name auto
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {Object} tasks - An object. Each of its properties is either a
+     * function or an array of requirements, with the {@link AsyncFunction} itself the last item
+     * in the array. The object's key of a property serves as the name of the task
+     * defined by that property, i.e. can be used when specifying requirements for
+     * other tasks. The function receives one or two arguments:
+     * * a `results` object, containing the results of the previously executed
+     *   functions, only passed if the task has any dependencies,
+     * * a `callback(err, result)` function, which must be called when finished,
+     *   passing an `error` (which can be `null`) and the result of the function's
+     *   execution.
+     * @param {number} [concurrency=Infinity] - An optional `integer` for
+     * determining the maximum number of tasks that can be run in parallel. By
+     * default, as many as possible.
+     * @param {Function} [callback] - An optional callback which is called when all
+     * the tasks have been completed. It receives the `err` argument if any `tasks`
+     * pass an error to their callback. Results are always returned; however, if an
+     * error occurs, no further `tasks` will be performed, and the results object
+     * will only contain partial results. Invoked with (err, results).
+     * @returns {Promise} a promise, if a callback is not passed
+     * @example
+     *
+     * async.auto({
+     *     // this function will just be passed a callback
+     *     readData: async.apply(fs.readFile, 'data.txt', 'utf-8'),
+     *     showData: ['readData', function(results, cb) {
+     *         // results.readData is the file's contents
+     *         // ...
+     *     }]
+     * }, callback);
+     *
+     * async.auto({
+     *     get_data: function(callback) {
+     *         console.log('in get_data');
+     *         // async code to get some data
+     *         callback(null, 'data', 'converted to array');
+     *     },
+     *     make_folder: function(callback) {
+     *         console.log('in make_folder');
+     *         // async code to create a directory to store a file in
+     *         // this is run at the same time as getting the data
+     *         callback(null, 'folder');
+     *     },
+     *     write_file: ['get_data', 'make_folder', function(results, callback) {
+     *         console.log('in write_file', JSON.stringify(results));
+     *         // once there is some data and the directory exists,
+     *         // write the data to a file in the directory
+     *         callback(null, 'filename');
+     *     }],
+     *     email_link: ['write_file', function(results, callback) {
+     *         console.log('in email_link', JSON.stringify(results));
+     *         // once the file is written let's email a link to it...
+     *         // results.write_file contains the filename returned by write_file.
+     *         callback(null, {'file':results.write_file, 'email':'user@example.com'});
+     *     }]
+     * }, function(err, results) {
+     *     console.log('err = ', err);
+     *     console.log('results = ', results);
+     * });
+     */
+    function auto(tasks, concurrency, callback) {
+        if (typeof concurrency !== 'number') {
+            // concurrency is optional, shift the args.
+            callback = concurrency;
+            concurrency = null;
+        }
+        callback = once(callback || promiseCallback());
+        var numTasks = Object.keys(tasks).length;
+        if (!numTasks) {
+            return callback(null);
+        }
+        if (!concurrency) {
+            concurrency = numTasks;
+        }
 
-    var listeners = Object.create(null);
+        var results = {};
+        var runningTasks = 0;
+        var canceled = false;
+        var hasError = false;
 
-    var readyTasks = [];
+        var listeners = Object.create(null);
 
-    // for cycle detection:
-    var readyToCheck = []; // tasks that have been identified as reachable
-    // without the possibility of returning to an ancestor task
-    var uncheckedDependencies = {};
+        var readyTasks = [];
 
-    baseForOwn(tasks, function (task, key) {
-        if (!isArray(task)) {
-            // no dependencies
-            enqueueTask(key, [task]);
-            readyToCheck.push(key);
-            return;
-        }
+        // for cycle detection:
+        var readyToCheck = []; // tasks that have been identified as reachable
+        // without the possibility of returning to an ancestor task
+        var uncheckedDependencies = {};
 
-        var dependencies = task.slice(0, task.length - 1);
-        var remainingDependencies = dependencies.length;
-        if (remainingDependencies === 0) {
-            enqueueTask(key, task);
-            readyToCheck.push(key);
-            return;
-        }
-        uncheckedDependencies[key] = remainingDependencies;
-
-        arrayEach(dependencies, function (dependencyName) {
-            if (!tasks[dependencyName]) {
-                throw new Error('async.auto task `' + key +
-                    '` has a non-existent dependency `' +
-                    dependencyName + '` in ' +
-                    dependencies.join(', '));
+        Object.keys(tasks).forEach(key => {
+            var task = tasks[key];
+            if (!Array.isArray(task)) {
+                // no dependencies
+                enqueueTask(key, [task]);
+                readyToCheck.push(key);
+                return;
             }
-            addListener(dependencyName, function () {
-                remainingDependencies--;
-                if (remainingDependencies === 0) {
-                    enqueueTask(key, task);
+
+            var dependencies = task.slice(0, task.length - 1);
+            var remainingDependencies = dependencies.length;
+            if (remainingDependencies === 0) {
+                enqueueTask(key, task);
+                readyToCheck.push(key);
+                return;
+            }
+            uncheckedDependencies[key] = remainingDependencies;
+
+            dependencies.forEach(dependencyName => {
+                if (!tasks[dependencyName]) {
+                    throw new Error('async.auto task `' + key +
+                        '` has a non-existent dependency `' +
+                        dependencyName + '` in ' +
+                        dependencies.join(', '));
                 }
+                addListener(dependencyName, () => {
+                    remainingDependencies--;
+                    if (remainingDependencies === 0) {
+                        enqueueTask(key, task);
+                    }
+                });
             });
         });
-    });
 
-    checkForDeadlocks();
-    processQueue();
-
-    function enqueueTask(key, task) {
-        readyTasks.push(function () {
-            runTask(key, task);
-        });
-    }
+        checkForDeadlocks();
+        processQueue();
 
-    function processQueue() {
-        if (readyTasks.length === 0 && runningTasks === 0) {
-            return callback(null, results);
+        function enqueueTask(key, task) {
+            readyTasks.push(() => runTask(key, task));
         }
-        while(readyTasks.length && runningTasks < concurrency) {
-            var run = readyTasks.shift();
-            run();
+
+        function processQueue() {
+            if (canceled) return
+            if (readyTasks.length === 0 && runningTasks === 0) {
+                return callback(null, results);
+            }
+            while(readyTasks.length && runningTasks < concurrency) {
+                var run = readyTasks.shift();
+                run();
+            }
+
         }
 
-    }
+        function addListener(taskName, fn) {
+            var taskListeners = listeners[taskName];
+            if (!taskListeners) {
+                taskListeners = listeners[taskName] = [];
+            }
 
-    function addListener(taskName, fn) {
-        var taskListeners = listeners[taskName];
-        if (!taskListeners) {
-            taskListeners = listeners[taskName] = [];
+            taskListeners.push(fn);
         }
 
-        taskListeners.push(fn);
-    }
+        function taskComplete(taskName) {
+            var taskListeners = listeners[taskName] || [];
+            taskListeners.forEach(fn => fn());
+            processQueue();
+        }
 
-    function taskComplete(taskName) {
-        var taskListeners = listeners[taskName] || [];
-        arrayEach(taskListeners, function (fn) {
-            fn();
-        });
-        processQueue();
-    }
 
+        function runTask(key, task) {
+            if (hasError) return;
 
-    function runTask(key, task) {
-        if (hasError) return;
+            var taskCallback = onlyOnce((err, ...result) => {
+                runningTasks--;
+                if (err === false) {
+                    canceled = true;
+                    return
+                }
+                if (result.length < 2) {
+                    [result] = result;
+                }
+                if (err) {
+                    var safeResults = {};
+                    Object.keys(results).forEach(rkey => {
+                        safeResults[rkey] = results[rkey];
+                    });
+                    safeResults[key] = result;
+                    hasError = true;
+                    listeners = Object.create(null);
+                    if (canceled) return
+                    callback(err, safeResults);
+                } else {
+                    results[key] = result;
+                    taskComplete(key);
+                }
+            });
 
-        var taskCallback = onlyOnce(function(err, result) {
-            runningTasks--;
-            if (arguments.length > 2) {
-                result = slice(arguments, 1);
+            runningTasks++;
+            var taskFn = wrapAsync(task[task.length - 1]);
+            if (task.length > 1) {
+                taskFn(results, taskCallback);
+            } else {
+                taskFn(taskCallback);
             }
-            if (err) {
-                var safeResults = {};
-                baseForOwn(results, function(val, rkey) {
-                    safeResults[rkey] = val;
-                });
-                safeResults[key] = result;
-                hasError = true;
-                listeners = Object.create(null);
+        }
 
-                callback(err, safeResults);
-            } else {
-                results[key] = result;
-                taskComplete(key);
+        function checkForDeadlocks() {
+            // Kahn's algorithm
+            // https://en.wikipedia.org/wiki/Topological_sorting#Kahn.27s_algorithm
+            // http://connalle.blogspot.com/2013/10/topological-sortingkahn-algorithm.html
+            var currentTask;
+            var counter = 0;
+            while (readyToCheck.length) {
+                currentTask = readyToCheck.pop();
+                counter++;
+                getDependents(currentTask).forEach(dependent => {
+                    if (--uncheckedDependencies[dependent] === 0) {
+                        readyToCheck.push(dependent);
+                    }
+                });
             }
-        });
 
-        runningTasks++;
-        var taskFn = wrapAsync(task[task.length - 1]);
-        if (task.length > 1) {
-            taskFn(results, taskCallback);
-        } else {
-            taskFn(taskCallback);
+            if (counter !== numTasks) {
+                throw new Error(
+                    'async.auto cannot execute tasks due to a recursive dependency'
+                );
+            }
         }
-    }
 
-    function checkForDeadlocks() {
-        // Kahn's algorithm
-        // https://en.wikipedia.org/wiki/Topological_sorting#Kahn.27s_algorithm
-        // http://connalle.blogspot.com/2013/10/topological-sortingkahn-algorithm.html
-        var currentTask;
-        var counter = 0;
-        while (readyToCheck.length) {
-            currentTask = readyToCheck.pop();
-            counter++;
-            arrayEach(getDependents(currentTask), function (dependent) {
-                if (--uncheckedDependencies[dependent] === 0) {
-                    readyToCheck.push(dependent);
+        function getDependents(taskName) {
+            var result = [];
+            Object.keys(tasks).forEach(key => {
+                const task = tasks[key];
+                if (Array.isArray(task) && task.indexOf(taskName) >= 0) {
+                    result.push(key);
                 }
             });
+            return result;
         }
 
-        if (counter !== numTasks) {
-            throw new Error(
-                'async.auto cannot execute tasks due to a recursive dependency'
-            );
+        return callback[PROMISE_SYMBOL]
+    }
+
+    var FN_ARGS = /^(?:async\s+)?(?:function)?\s*[^(]*\(\s*([^)]+)\s*\)(?:\s*{)/m;
+    var ARROW_FN_ARGS = /^(?:async\s+)?\(?\s*([^)^=]+)\s*\)?(?:\s*=>)/m;
+    var FN_ARG_SPLIT = /,/;
+    var FN_ARG = /(=.+)?(\s*)$/;
+    var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
+
+    function parseParams(func) {
+        const src = func.toString().replace(STRIP_COMMENTS, '');
+        let match = src.match(FN_ARGS);
+        if (!match) {
+            match = src.match(ARROW_FN_ARGS);
         }
+        if (!match) throw new Error('could not parse args in autoInject\nSource:\n' + src)
+        let [, args] = match;
+        return args
+            .replace(/\s/g, '')
+            .split(FN_ARG_SPLIT)
+            .map((arg) => arg.replace(FN_ARG, '').trim());
     }
 
-    function getDependents(taskName) {
-        var result = [];
-        baseForOwn(tasks, function (task, key) {
-            if (isArray(task) && baseIndexOf(task, taskName, 0) >= 0) {
-                result.push(key);
+    /**
+     * A dependency-injected version of the [async.auto]{@link module:ControlFlow.auto} function. Dependent
+     * tasks are specified as parameters to the function, after the usual callback
+     * parameter, with the parameter names matching the names of the tasks it
+     * depends on. This can provide even more readable task graphs which can be
+     * easier to maintain.
+     *
+     * If a final callback is specified, the task results are similarly injected,
+     * specified as named parameters after the initial error parameter.
+     *
+     * The autoInject function is purely syntactic sugar and its semantics are
+     * otherwise equivalent to [async.auto]{@link module:ControlFlow.auto}.
+     *
+     * @name autoInject
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.auto]{@link module:ControlFlow.auto}
+     * @category Control Flow
+     * @param {Object} tasks - An object, each of whose properties is an {@link AsyncFunction} of
+     * the form 'func([dependencies...], callback). The object's key of a property
+     * serves as the name of the task defined by that property, i.e. can be used
+     * when specifying requirements for other tasks.
+     * * The `callback` parameter is a `callback(err, result)` which must be called
+     *   when finished, passing an `error` (which can be `null`) and the result of
+     *   the function's execution. The remaining parameters name other tasks on
+     *   which the task is dependent, and the results from those tasks are the
+     *   arguments of those parameters.
+     * @param {Function} [callback] - An optional callback which is called when all
+     * the tasks have been completed. It receives the `err` argument if any `tasks`
+     * pass an error to their callback, and a `results` object with any completed
+     * task results, similar to `auto`.
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     *
+     * //  The example from `auto` can be rewritten as follows:
+     * async.autoInject({
+     *     get_data: function(callback) {
+     *         // async code to get some data
+     *         callback(null, 'data', 'converted to array');
+     *     },
+     *     make_folder: function(callback) {
+     *         // async code to create a directory to store a file in
+     *         // this is run at the same time as getting the data
+     *         callback(null, 'folder');
+     *     },
+     *     write_file: function(get_data, make_folder, callback) {
+     *         // once there is some data and the directory exists,
+     *         // write the data to a file in the directory
+     *         callback(null, 'filename');
+     *     },
+     *     email_link: function(write_file, callback) {
+     *         // once the file is written let's email a link to it...
+     *         // write_file contains the filename returned by write_file.
+     *         callback(null, {'file':write_file, 'email':'user@example.com'});
+     *     }
+     * }, function(err, results) {
+     *     console.log('err = ', err);
+     *     console.log('email_link = ', results.email_link);
+     * });
+     *
+     * // If you are using a JS minifier that mangles parameter names, `autoInject`
+     * // will not work with plain functions, since the parameter names will be
+     * // collapsed to a single letter identifier.  To work around this, you can
+     * // explicitly specify the names of the parameters your task function needs
+     * // in an array, similar to Angular.js dependency injection.
+     *
+     * // This still has an advantage over plain `auto`, since the results a task
+     * // depends on are still spread into arguments.
+     * async.autoInject({
+     *     //...
+     *     write_file: ['get_data', 'make_folder', function(get_data, make_folder, callback) {
+     *         callback(null, 'filename');
+     *     }],
+     *     email_link: ['write_file', function(write_file, callback) {
+     *         callback(null, {'file':write_file, 'email':'user@example.com'});
+     *     }]
+     *     //...
+     * }, function(err, results) {
+     *     console.log('err = ', err);
+     *     console.log('email_link = ', results.email_link);
+     * });
+     */
+    function autoInject(tasks, callback) {
+        var newTasks = {};
+
+        Object.keys(tasks).forEach(key => {
+            var taskFn = tasks[key];
+            var params;
+            var fnIsAsync = isAsync(taskFn);
+            var hasNoDeps =
+                (!fnIsAsync && taskFn.length === 1) ||
+                (fnIsAsync && taskFn.length === 0);
+
+            if (Array.isArray(taskFn)) {
+                params = [...taskFn];
+                taskFn = params.pop();
+
+                newTasks[key] = params.concat(params.length > 0 ? newTask : taskFn);
+            } else if (hasNoDeps) {
+                // no dependencies, use the function as-is
+                newTasks[key] = taskFn;
+            } else {
+                params = parseParams(taskFn);
+                if ((taskFn.length === 0 && !fnIsAsync) && params.length === 0) {
+                    throw new Error("autoInject task functions require explicit parameters.");
+                }
+
+                // remove callback param
+                if (!fnIsAsync) params.pop();
+
+                newTasks[key] = params.concat(newTask);
+            }
+
+            function newTask(results, taskCb) {
+                var newArgs = params.map(name => results[name]);
+                newArgs.push(taskCb);
+                wrapAsync(taskFn)(...newArgs);
             }
         });
-        return result;
+
+        return auto(newTasks, callback);
     }
-};
-
-/**
- * A specialized version of `_.map` for arrays without support for iteratee
- * shorthands.
- *
- * @private
- * @param {Array} [array] The array to iterate over.
- * @param {Function} iteratee The function invoked per iteration.
- * @returns {Array} Returns the new mapped array.
- */
-function arrayMap(array, iteratee) {
-  var index = -1,
-      length = array == null ? 0 : array.length,
-      result = Array(length);
-
-  while (++index < length) {
-    result[index] = iteratee(array[index], index, array);
-  }
-  return result;
-}
-
-/** `Object#toString` result references. */
-var symbolTag = '[object Symbol]';
-
-/**
- * Checks if `value` is classified as a `Symbol` primitive or object.
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
- * @example
- *
- * _.isSymbol(Symbol.iterator);
- * // => true
- *
- * _.isSymbol('abc');
- * // => false
- */
-function isSymbol(value) {
-  return typeof value == 'symbol' ||
-    (isObjectLike(value) && baseGetTag(value) == symbolTag);
-}
-
-/** Used as references for various `Number` constants. */
-var INFINITY = 1 / 0;
-
-/** Used to convert symbols to primitives and strings. */
-var symbolProto = Symbol$1 ? Symbol$1.prototype : undefined;
-var symbolToString = symbolProto ? symbolProto.toString : undefined;
-
-/**
- * The base implementation of `_.toString` which doesn't convert nullish
- * values to empty strings.
- *
- * @private
- * @param {*} value The value to process.
- * @returns {string} Returns the string.
- */
-function baseToString(value) {
-  // Exit early for strings to avoid a performance hit in some environments.
-  if (typeof value == 'string') {
-    return value;
-  }
-  if (isArray(value)) {
-    // Recursively convert values (susceptible to call stack limits).
-    return arrayMap(value, baseToString) + '';
-  }
-  if (isSymbol(value)) {
-    return symbolToString ? symbolToString.call(value) : '';
-  }
-  var result = (value + '');
-  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
-}
-
-/**
- * The base implementation of `_.slice` without an iteratee call guard.
- *
- * @private
- * @param {Array} array The array to slice.
- * @param {number} [start=0] The start position.
- * @param {number} [end=array.length] The end position.
- * @returns {Array} Returns the slice of `array`.
- */
-function baseSlice(array, start, end) {
-  var index = -1,
-      length = array.length;
-
-  if (start < 0) {
-    start = -start > length ? 0 : (length + start);
-  }
-  end = end > length ? length : end;
-  if (end < 0) {
-    end += length;
-  }
-  length = start > end ? 0 : ((end - start) >>> 0);
-  start >>>= 0;
-
-  var result = Array(length);
-  while (++index < length) {
-    result[index] = array[index + start];
-  }
-  return result;
-}
-
-/**
- * Casts `array` to a slice if it's needed.
- *
- * @private
- * @param {Array} array The array to inspect.
- * @param {number} start The start position.
- * @param {number} [end=array.length] The end position.
- * @returns {Array} Returns the cast slice.
- */
-function castSlice(array, start, end) {
-  var length = array.length;
-  end = end === undefined ? length : end;
-  return (!start && end >= length) ? array : baseSlice(array, start, end);
-}
-
-/**
- * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
- * that is not found in the character symbols.
- *
- * @private
- * @param {Array} strSymbols The string symbols to inspect.
- * @param {Array} chrSymbols The character symbols to find.
- * @returns {number} Returns the index of the last unmatched string symbol.
- */
-function charsEndIndex(strSymbols, chrSymbols) {
-  var index = strSymbols.length;
-
-  while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
-  return index;
-}
-
-/**
- * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
- * that is not found in the character symbols.
- *
- * @private
- * @param {Array} strSymbols The string symbols to inspect.
- * @param {Array} chrSymbols The character symbols to find.
- * @returns {number} Returns the index of the first unmatched string symbol.
- */
-function charsStartIndex(strSymbols, chrSymbols) {
-  var index = -1,
-      length = strSymbols.length;
-
-  while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
-  return index;
-}
-
-/**
- * Converts an ASCII `string` to an array.
- *
- * @private
- * @param {string} string The string to convert.
- * @returns {Array} Returns the converted array.
- */
-function asciiToArray(string) {
-  return string.split('');
-}
-
-/** Used to compose unicode character classes. */
-var rsAstralRange = '\\ud800-\\udfff';
-var rsComboMarksRange = '\\u0300-\\u036f';
-var reComboHalfMarksRange = '\\ufe20-\\ufe2f';
-var rsComboSymbolsRange = '\\u20d0-\\u20ff';
-var rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange;
-var rsVarRange = '\\ufe0e\\ufe0f';
-
-/** Used to compose unicode capture groups. */
-var rsZWJ = '\\u200d';
-
-/** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
-var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboRange + rsVarRange + ']');
-
-/**
- * Checks if `string` contains Unicode symbols.
- *
- * @private
- * @param {string} string The string to inspect.
- * @returns {boolean} Returns `true` if a symbol is found, else `false`.
- */
-function hasUnicode(string) {
-  return reHasUnicode.test(string);
-}
-
-/** Used to compose unicode character classes. */
-var rsAstralRange$1 = '\\ud800-\\udfff';
-var rsComboMarksRange$1 = '\\u0300-\\u036f';
-var reComboHalfMarksRange$1 = '\\ufe20-\\ufe2f';
-var rsComboSymbolsRange$1 = '\\u20d0-\\u20ff';
-var rsComboRange$1 = rsComboMarksRange$1 + reComboHalfMarksRange$1 + rsComboSymbolsRange$1;
-var rsVarRange$1 = '\\ufe0e\\ufe0f';
-
-/** Used to compose unicode capture groups. */
-var rsAstral = '[' + rsAstralRange$1 + ']';
-var rsCombo = '[' + rsComboRange$1 + ']';
-var rsFitz = '\\ud83c[\\udffb-\\udfff]';
-var rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')';
-var rsNonAstral = '[^' + rsAstralRange$1 + ']';
-var rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}';
-var rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]';
-var rsZWJ$1 = '\\u200d';
-
-/** Used to compose unicode regexes. */
-var reOptMod = rsModifier + '?';
-var rsOptVar = '[' + rsVarRange$1 + ']?';
-var rsOptJoin = '(?:' + rsZWJ$1 + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*';
-var rsSeq = rsOptVar + reOptMod + rsOptJoin;
-var rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
-
-/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
-var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
-
-/**
- * Converts a Unicode `string` to an array.
- *
- * @private
- * @param {string} string The string to convert.
- * @returns {Array} Returns the converted array.
- */
-function unicodeToArray(string) {
-  return string.match(reUnicode) || [];
-}
-
-/**
- * Converts `string` to an array.
- *
- * @private
- * @param {string} string The string to convert.
- * @returns {Array} Returns the converted array.
- */
-function stringToArray(string) {
-  return hasUnicode(string)
-    ? unicodeToArray(string)
-    : asciiToArray(string);
-}
-
-/**
- * Converts `value` to a string. An empty string is returned for `null`
- * and `undefined` values. The sign of `-0` is preserved.
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @category Lang
- * @param {*} value The value to convert.
- * @returns {string} Returns the converted string.
- * @example
- *
- * _.toString(null);
- * // => ''
- *
- * _.toString(-0);
- * // => '-0'
- *
- * _.toString([1, 2, 3]);
- * // => '1,2,3'
- */
-function toString(value) {
-  return value == null ? '' : baseToString(value);
-}
-
-/** Used to match leading and trailing whitespace. */
-var reTrim = /^\s+|\s+$/g;
-
-/**
- * Removes leading and trailing whitespace or specified characters from `string`.
- *
- * @static
- * @memberOf _
- * @since 3.0.0
- * @category String
- * @param {string} [string=''] The string to trim.
- * @param {string} [chars=whitespace] The characters to trim.
- * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
- * @returns {string} Returns the trimmed string.
- * @example
- *
- * _.trim('  abc  ');
- * // => 'abc'
- *
- * _.trim('-_-abc-_-', '_-');
- * // => 'abc'
- *
- * _.map(['  foo  ', '  bar  '], _.trim);
- * // => ['foo', 'bar']
- */
-function trim(string, chars, guard) {
-  string = toString(string);
-  if (string && (guard || chars === undefined)) {
-    return string.replace(reTrim, '');
-  }
-  if (!string || !(chars = baseToString(chars))) {
-    return string;
-  }
-  var strSymbols = stringToArray(string),
-      chrSymbols = stringToArray(chars),
-      start = charsStartIndex(strSymbols, chrSymbols),
-      end = charsEndIndex(strSymbols, chrSymbols) + 1;
-
-  return castSlice(strSymbols, start, end).join('');
-}
-
-var FN_ARGS = /^(?:async\s+)?(function)?\s*[^\(]*\(\s*([^\)]*)\)/m;
-var FN_ARG_SPLIT = /,/;
-var FN_ARG = /(=.+)?(\s*)$/;
-var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
-
-function parseParams(func) {
-    func = func.toString().replace(STRIP_COMMENTS, '');
-    func = func.match(FN_ARGS)[2].replace(' ', '');
-    func = func ? func.split(FN_ARG_SPLIT) : [];
-    func = func.map(function (arg){
-        return trim(arg.replace(FN_ARG, ''));
-    });
-    return func;
-}
-
-/**
- * A dependency-injected version of the [async.auto]{@link module:ControlFlow.auto} function. Dependent
- * tasks are specified as parameters to the function, after the usual callback
- * parameter, with the parameter names matching the names of the tasks it
- * depends on. This can provide even more readable task graphs which can be
- * easier to maintain.
- *
- * If a final callback is specified, the task results are similarly injected,
- * specified as named parameters after the initial error parameter.
- *
- * The autoInject function is purely syntactic sugar and its semantics are
- * otherwise equivalent to [async.auto]{@link module:ControlFlow.auto}.
- *
- * @name autoInject
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.auto]{@link module:ControlFlow.auto}
- * @category Control Flow
- * @param {Object} tasks - An object, each of whose properties is an {@link AsyncFunction} of
- * the form 'func([dependencies...], callback). The object's key of a property
- * serves as the name of the task defined by that property, i.e. can be used
- * when specifying requirements for other tasks.
- * * The `callback` parameter is a `callback(err, result)` which must be called
- *   when finished, passing an `error` (which can be `null`) and the result of
- *   the function's execution. The remaining parameters name other tasks on
- *   which the task is dependent, and the results from those tasks are the
- *   arguments of those parameters.
- * @param {Function} [callback] - An optional callback which is called when all
- * the tasks have been completed. It receives the `err` argument if any `tasks`
- * pass an error to their callback, and a `results` object with any completed
- * task results, similar to `auto`.
- * @example
- *
- * //  The example from `auto` can be rewritten as follows:
- * async.autoInject({
- *     get_data: function(callback) {
- *         // async code to get some data
- *         callback(null, 'data', 'converted to array');
- *     },
- *     make_folder: function(callback) {
- *         // async code to create a directory to store a file in
- *         // this is run at the same time as getting the data
- *         callback(null, 'folder');
- *     },
- *     write_file: function(get_data, make_folder, callback) {
- *         // once there is some data and the directory exists,
- *         // write the data to a file in the directory
- *         callback(null, 'filename');
- *     },
- *     email_link: function(write_file, callback) {
- *         // once the file is written let's email a link to it...
- *         // write_file contains the filename returned by write_file.
- *         callback(null, {'file':write_file, 'email':'user@example.com'});
- *     }
- * }, function(err, results) {
- *     console.log('err = ', err);
- *     console.log('email_link = ', results.email_link);
- * });
- *
- * // If you are using a JS minifier that mangles parameter names, `autoInject`
- * // will not work with plain functions, since the parameter names will be
- * // collapsed to a single letter identifier.  To work around this, you can
- * // explicitly specify the names of the parameters your task function needs
- * // in an array, similar to Angular.js dependency injection.
- *
- * // This still has an advantage over plain `auto`, since the results a task
- * // depends on are still spread into arguments.
- * async.autoInject({
- *     //...
- *     write_file: ['get_data', 'make_folder', function(get_data, make_folder, callback) {
- *         callback(null, 'filename');
- *     }],
- *     email_link: ['write_file', function(write_file, callback) {
- *         callback(null, {'file':write_file, 'email':'user@example.com'});
- *     }]
- *     //...
- * }, function(err, results) {
- *     console.log('err = ', err);
- *     console.log('email_link = ', results.email_link);
- * });
- */
-function autoInject(tasks, callback) {
-    var newTasks = {};
-
-    baseForOwn(tasks, function (taskFn, key) {
-        var params;
-        var fnIsAsync = isAsync(taskFn);
-        var hasNoDeps =
-            (!fnIsAsync && taskFn.length === 1) ||
-            (fnIsAsync && taskFn.length === 0);
-
-        if (isArray(taskFn)) {
-            params = taskFn.slice(0, -1);
-            taskFn = taskFn[taskFn.length - 1];
-
-            newTasks[key] = params.concat(params.length > 0 ? newTask : taskFn);
-        } else if (hasNoDeps) {
-            // no dependencies, use the function as-is
-            newTasks[key] = taskFn;
-        } else {
-            params = parseParams(taskFn);
-            if (taskFn.length === 0 && !fnIsAsync && params.length === 0) {
-                throw new Error("autoInject task functions require explicit parameters.");
-            }
 
-            // remove callback param
-            if (!fnIsAsync) params.pop();
+    // Simple doubly linked list (https://en.wikipedia.org/wiki/Doubly_linked_list) implementation
+    // used for queues. This implementation assumes that the node provided by the user can be modified
+    // to adjust the next and last properties. We implement only the minimal functionality
+    // for queue support.
+    class DLL {
+        constructor() {
+            this.head = this.tail = null;
+            this.length = 0;
+        }
+
+        removeLink(node) {
+            if (node.prev) node.prev.next = node.next;
+            else this.head = node.next;
+            if (node.next) node.next.prev = node.prev;
+            else this.tail = node.prev;
 
-            newTasks[key] = params.concat(newTask);
+            node.prev = node.next = null;
+            this.length -= 1;
+            return node;
         }
 
-        function newTask(results, taskCb) {
-            var newArgs = arrayMap(params, function (name) {
-                return results[name];
-            });
-            newArgs.push(taskCb);
-            wrapAsync(taskFn).apply(null, newArgs);
+        empty () {
+            while(this.head) this.shift();
+            return this;
         }
-    });
-
-    auto(newTasks, callback);
-}
-
-// Simple doubly linked list (https://en.wikipedia.org/wiki/Doubly_linked_list) implementation
-// used for queues. This implementation assumes that the node provided by the user can be modified
-// to adjust the next and last properties. We implement only the minimal functionality
-// for queue support.
-function DLL() {
-    this.head = this.tail = null;
-    this.length = 0;
-}
-
-function setInitial(dll, node) {
-    dll.length = 1;
-    dll.head = dll.tail = node;
-}
-
-DLL.prototype.removeLink = function(node) {
-    if (node.prev) node.prev.next = node.next;
-    else this.head = node.next;
-    if (node.next) node.next.prev = node.prev;
-    else this.tail = node.prev;
-
-    node.prev = node.next = null;
-    this.length -= 1;
-    return node;
-};
-
-DLL.prototype.empty = function () {
-    while(this.head) this.shift();
-    return this;
-};
-
-DLL.prototype.insertAfter = function(node, newNode) {
-    newNode.prev = node;
-    newNode.next = node.next;
-    if (node.next) node.next.prev = newNode;
-    else this.tail = newNode;
-    node.next = newNode;
-    this.length += 1;
-};
-
-DLL.prototype.insertBefore = function(node, newNode) {
-    newNode.prev = node.prev;
-    newNode.next = node;
-    if (node.prev) node.prev.next = newNode;
-    else this.head = newNode;
-    node.prev = newNode;
-    this.length += 1;
-};
-
-DLL.prototype.unshift = function(node) {
-    if (this.head) this.insertBefore(this.head, node);
-    else setInitial(this, node);
-};
-
-DLL.prototype.push = function(node) {
-    if (this.tail) this.insertAfter(this.tail, node);
-    else setInitial(this, node);
-};
-
-DLL.prototype.shift = function() {
-    return this.head && this.removeLink(this.head);
-};
-
-DLL.prototype.pop = function() {
-    return this.tail && this.removeLink(this.tail);
-};
-
-DLL.prototype.toArray = function () {
-    var arr = Array(this.length);
-    var curr = this.head;
-    for(var idx = 0; idx < this.length; idx++) {
-        arr[idx] = curr.data;
-        curr = curr.next;
-    }
-    return arr;
-};
-
-DLL.prototype.remove = function (testFn) {
-    var curr = this.head;
-    while(!!curr) {
-        var next = curr.next;
-        if (testFn(curr)) {
-            this.removeLink(curr);
+
+        insertAfter(node, newNode) {
+            newNode.prev = node;
+            newNode.next = node.next;
+            if (node.next) node.next.prev = newNode;
+            else this.tail = newNode;
+            node.next = newNode;
+            this.length += 1;
         }
-        curr = next;
-    }
-    return this;
-};
 
-function queue(worker, concurrency, payload) {
-    if (concurrency == null) {
-        concurrency = 1;
-    }
-    else if(concurrency === 0) {
-        throw new Error('Concurrency must not be zero');
-    }
+        insertBefore(node, newNode) {
+            newNode.prev = node.prev;
+            newNode.next = node;
+            if (node.prev) node.prev.next = newNode;
+            else this.head = newNode;
+            node.prev = newNode;
+            this.length += 1;
+        }
 
-    var _worker = wrapAsync(worker);
-    var numRunning = 0;
-    var workersList = [];
+        unshift(node) {
+            if (this.head) this.insertBefore(this.head, node);
+            else setInitial(this, node);
+        }
 
-    var processingScheduled = false;
-    function _insert(data, insertAtFront, callback) {
-        if (callback != null && typeof callback !== 'function') {
-            throw new Error('task callback must be a function');
+        push(node) {
+            if (this.tail) this.insertAfter(this.tail, node);
+            else setInitial(this, node);
         }
-        q.started = true;
-        if (!isArray(data)) {
-            data = [data];
+
+        shift() {
+            return this.head && this.removeLink(this.head);
         }
-        if (data.length === 0 && q.idle()) {
-            // call drain immediately if there are no tasks
-            return setImmediate$1(function() {
-                q.drain();
-            });
+
+        pop() {
+            return this.tail && this.removeLink(this.tail);
         }
 
-        for (var i = 0, l = data.length; i < l; i++) {
-            var item = {
-                data: data[i],
-                callback: callback || noop
-            };
+        toArray() {
+            return [...this]
+        }
 
-            if (insertAtFront) {
-                q._tasks.unshift(item);
-            } else {
-                q._tasks.push(item);
+        *[Symbol.iterator] () {
+            var cur = this.head;
+            while (cur) {
+                yield cur.data;
+                cur = cur.next;
             }
         }
 
-        if (!processingScheduled) {
-            processingScheduled = true;
-            setImmediate$1(function() {
-                processingScheduled = false;
-                q.process();
-            });
+        remove (testFn) {
+            var curr = this.head;
+            while(curr) {
+                var {next} = curr;
+                if (testFn(curr)) {
+                    this.removeLink(curr);
+                }
+                curr = next;
+            }
+            return this;
         }
     }
 
-    function _next(tasks) {
-        return function(err){
-            numRunning -= 1;
+    function setInitial(dll, node) {
+        dll.length = 1;
+        dll.head = dll.tail = node;
+    }
 
-            for (var i = 0, l = tasks.length; i < l; i++) {
-                var task = tasks[i];
+    const noop = () => {};
 
-                var index = baseIndexOf(workersList, task, 0);
-                if (index === 0) {
-                    workersList.shift();
-                } else if (index > 0) {
-                    workersList.splice(index, 1);
-                }
+    function queue(worker, concurrency, payload) {
+        if (concurrency == null) {
+            concurrency = 1;
+        }
+        else if(concurrency === 0) {
+            throw new RangeError('Concurrency must not be zero');
+        }
 
-                task.callback.apply(task, arguments);
+        var _worker = wrapAsync(worker);
+        var numRunning = 0;
+        var workersList = [];
 
-                if (err != null) {
-                    q.error(err, task.data);
-                }
+        var processingScheduled = false;
+        function _insert(data, insertAtFront, callback) {
+            if (callback != null && typeof callback !== 'function') {
+                throw new Error('task callback must be a function');
             }
-
-            if (numRunning <= (q.concurrency - q.buffer) ) {
-                q.unsaturated();
+            q.started = true;
+            if (!Array.isArray(data)) {
+                data = [data];
             }
+            if (data.length === 0 && q.idle()) {
+                // call drain immediately if there are no tasks
+                return setImmediate$1(() => q.drain());
+            }
+
+            for (var i = 0, l = data.length; i < l; i++) {
+                var item = {
+                    data: data[i],
+                    callback: callback || noop
+                };
 
-            if (q.idle()) {
-                q.drain();
+                if (insertAtFront) {
+                    q._tasks.unshift(item);
+                } else {
+                    q._tasks.push(item);
+                }
             }
-            q.process();
-        };
-    }
 
-    var isProcessing = false;
-    var q = {
-        _tasks: new DLL(),
-        concurrency: concurrency,
-        payload: payload,
-        saturated: noop,
-        unsaturated:noop,
-        buffer: concurrency / 4,
-        empty: noop,
-        drain: noop,
-        error: noop,
-        started: false,
-        paused: false,
-        push: function (data, callback) {
-            _insert(data, false, callback);
-        },
-        kill: function () {
-            q.drain = noop;
-            q._tasks.empty();
-        },
-        unshift: function (data, callback) {
-            _insert(data, true, callback);
-        },
-        remove: function (testFn) {
-            q._tasks.remove(testFn);
-        },
-        process: function () {
-            // Avoid trying to start too many processing operations. This can occur
-            // when callbacks resolve synchronously (#1267).
-            if (isProcessing) {
-                return;
+            if (!processingScheduled) {
+                processingScheduled = true;
+                setImmediate$1(() => {
+                    processingScheduled = false;
+                    q.process();
+                });
             }
-            isProcessing = true;
-            while(!q.paused && numRunning < q.concurrency && q._tasks.length){
-                var tasks = [], data = [];
-                var l = q._tasks.length;
-                if (q.payload) l = Math.min(l, q.payload);
-                for (var i = 0; i < l; i++) {
-                    var node = q._tasks.shift();
-                    tasks.push(node);
-                    workersList.push(node);
-                    data.push(node.data);
-                }
+        }
+
+        function _next(tasks) {
+            return function (err, ...args) {
+                numRunning -= 1;
+
+                for (var i = 0, l = tasks.length; i < l; i++) {
+                    var task = tasks[i];
 
-                numRunning += 1;
+                    var index = workersList.indexOf(task);
+                    if (index === 0) {
+                        workersList.shift();
+                    } else if (index > 0) {
+                        workersList.splice(index, 1);
+                    }
+
+                    task.callback(err, ...args);
 
-                if (q._tasks.length === 0) {
-                    q.empty();
+                    if (err != null) {
+                        q.error(err, task.data);
+                    }
                 }
 
-                if (numRunning === q.concurrency) {
-                    q.saturated();
+                if (numRunning <= (q.concurrency - q.buffer) ) {
+                    q.unsaturated();
                 }
 
-                var cb = onlyOnce(_next(tasks));
-                _worker(data, cb);
-            }
-            isProcessing = false;
-        },
-        length: function () {
-            return q._tasks.length;
-        },
-        running: function () {
-            return numRunning;
-        },
-        workersList: function () {
-            return workersList;
-        },
-        idle: function() {
-            return q._tasks.length + numRunning === 0;
-        },
-        pause: function () {
-            q.paused = true;
-        },
-        resume: function () {
-            if (q.paused === false) { return; }
-            q.paused = false;
-            setImmediate$1(q.process);
-        }
-    };
-    return q;
-}
-
-/**
- * A cargo of tasks for the worker function to complete. Cargo inherits all of
- * the same methods and event callbacks as [`queue`]{@link module:ControlFlow.queue}.
- * @typedef {Object} CargoObject
- * @memberOf module:ControlFlow
- * @property {Function} length - A function returning the number of items
- * waiting to be processed. Invoke like `cargo.length()`.
- * @property {number} payload - An `integer` for determining how many tasks
- * should be process per round. This property can be changed after a `cargo` is
- * created to alter the payload on-the-fly.
- * @property {Function} push - Adds `task` to the `queue`. The callback is
- * called once the `worker` has finished processing the task. Instead of a
- * single task, an array of `tasks` can be submitted. The respective callback is
- * used for every task in the list. Invoke like `cargo.push(task, [callback])`.
- * @property {Function} saturated - A callback that is called when the
- * `queue.length()` hits the concurrency and further tasks will be queued.
- * @property {Function} empty - A callback that is called when the last item
- * from the `queue` is given to a `worker`.
- * @property {Function} drain - A callback that is called when the last item
- * from the `queue` has returned from the `worker`.
- * @property {Function} idle - a function returning false if there are items
- * waiting or being processed, or true if not. Invoke like `cargo.idle()`.
- * @property {Function} pause - a function that pauses the processing of tasks
- * until `resume()` is called. Invoke like `cargo.pause()`.
- * @property {Function} resume - a function that resumes the processing of
- * queued tasks when the queue is paused. Invoke like `cargo.resume()`.
- * @property {Function} kill - a function that removes the `drain` callback and
- * empties remaining tasks from the queue forcing it to go idle. Invoke like `cargo.kill()`.
- */
-
-/**
- * Creates a `cargo` object with the specified payload. Tasks added to the
- * cargo will be processed altogether (up to the `payload` limit). If the
- * `worker` is in progress, the task is queued until it becomes available. Once
- * the `worker` has completed some tasks, each callback of those tasks is
- * called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
- * for how `cargo` and `queue` work.
- *
- * While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
- * at a time, cargo passes an array of tasks to a single worker, repeating
- * when the worker is finished.
- *
- * @name cargo
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.queue]{@link module:ControlFlow.queue}
- * @category Control Flow
- * @param {AsyncFunction} worker - An asynchronous function for processing an array
- * of queued tasks. Invoked with `(tasks, callback)`.
- * @param {number} [payload=Infinity] - An optional `integer` for determining
- * how many tasks should be processed per round; if omitted, the default is
- * unlimited.
- * @returns {module:ControlFlow.CargoObject} A cargo object to manage the tasks. Callbacks can
- * attached as certain properties to listen for specific events during the
- * lifecycle of the cargo and inner queue.
- * @example
- *
- * // create a cargo object with payload 2
- * var cargo = async.cargo(function(tasks, callback) {
- *     for (var i=0; i<tasks.length; i++) {
- *         console.log('hello ' + tasks[i].name);
- *     }
- *     callback();
- * }, 2);
- *
- * // add some items
- * cargo.push({name: 'foo'}, function(err) {
- *     console.log('finished processing foo');
- * });
- * cargo.push({name: 'bar'}, function(err) {
- *     console.log('finished processing bar');
- * });
- * cargo.push({name: 'baz'}, function(err) {
- *     console.log('finished processing baz');
- * });
- */
-function cargo(worker, payload) {
-    return queue(worker, 1, payload);
-}
-
-/**
- * The same as [`eachOf`]{@link module:Collections.eachOf} but runs only a single async operation at a time.
- *
- * @name eachOfSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.eachOf]{@link module:Collections.eachOf}
- * @alias forEachOfSeries
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * Invoked with (item, key, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Invoked with (err).
- */
-var eachOfSeries = doLimit(eachOfLimit, 1);
-
-/**
- * Reduces `coll` into a single value using an async `iteratee` to return each
- * successive step. `memo` is the initial state of the reduction. This function
- * only operates in series.
- *
- * For performance reasons, it may make sense to split a call to this function
- * into a parallel map, and then use the normal `Array.prototype.reduce` on the
- * results. This function is for situations where each step in the reduction
- * needs to be async; if you can get the data before reducing it, then it's
- * probably a good idea to do so.
- *
- * @name reduce
- * @static
- * @memberOf module:Collections
- * @method
- * @alias inject
- * @alias foldl
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {*} memo - The initial state of the reduction.
- * @param {AsyncFunction} iteratee - A function applied to each item in the
- * array to produce the next step in the reduction.
- * The `iteratee` should complete with the next state of the reduction.
- * If the iteratee complete with an error, the reduction is stopped and the
- * main `callback` is immediately called with the error.
- * Invoked with (memo, item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Result is the reduced value. Invoked with
- * (err, result).
- * @example
- *
- * async.reduce([1,2,3], 0, function(memo, item, callback) {
- *     // pointless async:
- *     process.nextTick(function() {
- *         callback(null, memo + item)
- *     });
- * }, function(err, result) {
- *     // result is now equal to the last value of memo, which is 6
- * });
- */
-function reduce(coll, memo, iteratee, callback) {
-    callback = once(callback || noop);
-    var _iteratee = wrapAsync(iteratee);
-    eachOfSeries(coll, function(x, i, callback) {
-        _iteratee(memo, x, function(err, v) {
-            memo = v;
-            callback(err);
-        });
-    }, function(err) {
-        callback(err, memo);
-    });
-}
-
-/**
- * Version of the compose function that is more natural to read. Each function
- * consumes the return value of the previous function. It is the equivalent of
- * [compose]{@link module:ControlFlow.compose} with the arguments reversed.
- *
- * Each function is executed with the `this` binding of the composed function.
- *
- * @name seq
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.compose]{@link module:ControlFlow.compose}
- * @category Control Flow
- * @param {...AsyncFunction} functions - the asynchronous functions to compose
- * @returns {Function} a function that composes the `functions` in order
- * @example
- *
- * // Requires lodash (or underscore), express3 and dresende's orm2.
- * // Part of an app, that fetches cats of the logged user.
- * // This example uses `seq` function to avoid overnesting and error
- * // handling clutter.
- * app.get('/cats', function(request, response) {
- *     var User = request.models.User;
- *     async.seq(
- *         _.bind(User.get, User),  // 'User.get' has signature (id, callback(err, data))
- *         function(user, fn) {
- *             user.getCats(fn);      // 'getCats' has signature (callback(err, data))
- *         }
- *     )(req.session.user_id, function (err, cats) {
- *         if (err) {
- *             console.error(err);
- *             response.json({ status: 'error', message: err.message });
- *         } else {
- *             response.json({ status: 'ok', message: 'Cats found', data: cats });
- *         }
- *     });
- * });
- */
-function seq(/*...functions*/) {
-    var _functions = arrayMap(arguments, wrapAsync);
-    return function(/*...args*/) {
-        var args = slice(arguments);
-        var that = this;
-
-        var cb = args[args.length - 1];
-        if (typeof cb == 'function') {
-            args.pop();
-        } else {
-            cb = noop;
+                if (q.idle()) {
+                    q.drain();
+                }
+                q.process();
+            };
         }
 
-        reduce(_functions, args, function(newargs, fn, cb) {
-            fn.apply(that, newargs.concat(function(err/*, ...nextargs*/) {
-                var nextargs = slice(arguments, 1);
-                cb(err, nextargs);
-            }));
-        },
-        function(err, results) {
-            cb.apply(that, [err].concat(results));
-        });
-    };
-}
-
-/**
- * Creates a function which is a composition of the passed asynchronous
- * functions. Each function consumes the return value of the function that
- * follows. Composing functions `f()`, `g()`, and `h()` would produce the result
- * of `f(g(h()))`, only this version uses callbacks to obtain the return values.
- *
- * Each function is executed with the `this` binding of the composed function.
- *
- * @name compose
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {...AsyncFunction} functions - the asynchronous functions to compose
- * @returns {Function} an asynchronous function that is the composed
- * asynchronous `functions`
- * @example
- *
- * function add1(n, callback) {
- *     setTimeout(function () {
- *         callback(null, n + 1);
- *     }, 10);
- * }
- *
- * function mul3(n, callback) {
- *     setTimeout(function () {
- *         callback(null, n * 3);
- *     }, 10);
- * }
- *
- * var add1mul3 = async.compose(mul3, add1);
- * add1mul3(4, function (err, result) {
- *     // result now equals 15
- * });
- */
-var compose = function(/*...args*/) {
-    return seq.apply(null, slice(arguments).reverse());
-};
-
-var _concat = Array.prototype.concat;
-
-/**
- * The same as [`concat`]{@link module:Collections.concat} but runs a maximum of `limit` async operations at a time.
- *
- * @name concatLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.concat]{@link module:Collections.concat}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
- * which should use an array as its result. Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished, or an error occurs. Results is an array
- * containing the concatenated results of the `iteratee` function. Invoked with
- * (err, results).
- */
-var concatLimit = function(coll, limit, iteratee, callback) {
-    callback = callback || noop;
-    var _iteratee = wrapAsync(iteratee);
-    mapLimit(coll, limit, function(val, callback) {
-        _iteratee(val, function(err /*, ...args*/) {
-            if (err) return callback(err);
-            return callback(null, slice(arguments, 1));
-        });
-    }, function(err, mapResults) {
-        var result = [];
-        for (var i = 0; i < mapResults.length; i++) {
-            if (mapResults[i]) {
-                result = _concat.apply(result, mapResults[i]);
-            }
-        }
+        var isProcessing = false;
+        var q = {
+            _tasks: new DLL(),
+            *[Symbol.iterator] () {
+                yield* q._tasks[Symbol.iterator]();
+            },
+            concurrency,
+            payload,
+            saturated: noop,
+            unsaturated:noop,
+            buffer: concurrency / 4,
+            empty: noop,
+            drain: noop,
+            error: noop,
+            started: false,
+            paused: false,
+            push (data, callback) {
+                _insert(data, false, callback);
+            },
+            kill () {
+                q.drain = noop;
+                q._tasks.empty();
+            },
+            unshift (data, callback) {
+                _insert(data, true, callback);
+            },
+            remove (testFn) {
+                q._tasks.remove(testFn);
+            },
+            process () {
+                // Avoid trying to start too many processing operations. This can occur
+                // when callbacks resolve synchronously (#1267).
+                if (isProcessing) {
+                    return;
+                }
+                isProcessing = true;
+                while(!q.paused && numRunning < q.concurrency && q._tasks.length){
+                    var tasks = [], data = [];
+                    var l = q._tasks.length;
+                    if (q.payload) l = Math.min(l, q.payload);
+                    for (var i = 0; i < l; i++) {
+                        var node = q._tasks.shift();
+                        tasks.push(node);
+                        workersList.push(node);
+                        data.push(node.data);
+                    }
 
-        return callback(err, result);
-    });
-};
-
-/**
- * Applies `iteratee` to each item in `coll`, concatenating the results. Returns
- * the concatenated list. The `iteratee`s are called in parallel, and the
- * results are concatenated as they return. There is no guarantee that the
- * results array will be returned in the original order of `coll` passed to the
- * `iteratee` function.
- *
- * @name concat
- * @static
- * @memberOf module:Collections
- * @method
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
- * which should use an array as its result. Invoked with (item, callback).
- * @param {Function} [callback(err)] - A callback which is called after all the
- * `iteratee` functions have finished, or an error occurs. Results is an array
- * containing the concatenated results of the `iteratee` function. Invoked with
- * (err, results).
- * @example
- *
- * async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
- *     // files is now a list of filenames that exist in the 3 directories
- * });
- */
-var concat = doLimit(concatLimit, Infinity);
-
-/**
- * The same as [`concat`]{@link module:Collections.concat} but runs only a single async operation at a time.
- *
- * @name concatSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.concat]{@link module:Collections.concat}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`.
- * The iteratee should complete with an array an array of results.
- * Invoked with (item, callback).
- * @param {Function} [callback(err)] - A callback which is called after all the
- * `iteratee` functions have finished, or an error occurs. Results is an array
- * containing the concatenated results of the `iteratee` function. Invoked with
- * (err, results).
- */
-var concatSeries = doLimit(concatLimit, 1);
-
-/**
- * Returns a function that when called, calls-back with the values provided.
- * Useful as the first function in a [`waterfall`]{@link module:ControlFlow.waterfall}, or for plugging values in to
- * [`auto`]{@link module:ControlFlow.auto}.
- *
- * @name constant
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {...*} arguments... - Any number of arguments to automatically invoke
- * callback with.
- * @returns {AsyncFunction} Returns a function that when invoked, automatically
- * invokes the callback with the previous given arguments.
- * @example
- *
- * async.waterfall([
- *     async.constant(42),
- *     function (value, next) {
- *         // value === 42
- *     },
- *     //...
- * ], callback);
- *
- * async.waterfall([
- *     async.constant(filename, "utf8"),
- *     fs.readFile,
- *     function (fileData, next) {
- *         //...
- *     }
- *     //...
- * ], callback);
- *
- * async.auto({
- *     hostname: async.constant("https://server.net/"),
- *     port: findFreePort,
- *     launchServer: ["hostname", "port", function (options, cb) {
- *         startServer(options, cb);
- *     }],
- *     //...
- * }, callback);
- */
-var constant = function(/*...values*/) {
-    var values = slice(arguments);
-    var args = [null].concat(values);
-    return function (/*...ignoredArgs, callback*/) {
-        var callback = arguments[arguments.length - 1];
-        return callback.apply(this, args);
-    };
-};
-
-/**
- * This method returns the first argument it receives.
- *
- * @static
- * @since 0.1.0
- * @memberOf _
- * @category Util
- * @param {*} value Any value.
- * @returns {*} Returns `value`.
- * @example
- *
- * var object = { 'a': 1 };
- *
- * console.log(_.identity(object) === object);
- * // => true
- */
-function identity(value) {
-  return value;
-}
-
-function _createTester(check, getResult) {
-    return function(eachfn, arr, iteratee, cb) {
-        cb = cb || noop;
-        var testPassed = false;
-        var testResult;
-        eachfn(arr, function(value, _, callback) {
-            iteratee(value, function(err, result) {
-                if (err) {
-                    callback(err);
-                } else if (check(result) && !testResult) {
-                    testPassed = true;
-                    testResult = getResult(true, value);
-                    callback(null, breakLoop);
-                } else {
-                    callback();
+                    numRunning += 1;
+
+                    if (q._tasks.length === 0) {
+                        q.empty();
+                    }
+
+                    if (numRunning === q.concurrency) {
+                        q.saturated();
+                    }
+
+                    var cb = onlyOnce(_next(tasks));
+                    _worker(data, cb);
                 }
+                isProcessing = false;
+            },
+            length () {
+                return q._tasks.length;
+            },
+            running () {
+                return numRunning;
+            },
+            workersList () {
+                return workersList;
+            },
+            idle() {
+                return q._tasks.length + numRunning === 0;
+            },
+            pause () {
+                q.paused = true;
+            },
+            resume () {
+                if (q.paused === false) { return; }
+                q.paused = false;
+                setImmediate$1(q.process);
+            }
+        };
+        return q;
+    }
+
+    /**
+     * A cargo of tasks for the worker function to complete. Cargo inherits all of
+     * the same methods and event callbacks as [`queue`]{@link module:ControlFlow.queue}.
+     * @typedef {Object} CargoObject
+     * @memberOf module:ControlFlow
+     * @property {Function} length - A function returning the number of items
+     * waiting to be processed. Invoke like `cargo.length()`.
+     * @property {number} payload - An `integer` for determining how many tasks
+     * should be process per round. This property can be changed after a `cargo` is
+     * created to alter the payload on-the-fly.
+     * @property {Function} push - Adds `task` to the `queue`. The callback is
+     * called once the `worker` has finished processing the task. Instead of a
+     * single task, an array of `tasks` can be submitted. The respective callback is
+     * used for every task in the list. Invoke like `cargo.push(task, [callback])`.
+     * @property {Function} saturated - A callback that is called when the
+     * `queue.length()` hits the concurrency and further tasks will be queued.
+     * @property {Function} empty - A callback that is called when the last item
+     * from the `queue` is given to a `worker`.
+     * @property {Function} drain - A callback that is called when the last item
+     * from the `queue` has returned from the `worker`.
+     * @property {Function} idle - a function returning false if there are items
+     * waiting or being processed, or true if not. Invoke like `cargo.idle()`.
+     * @property {Function} pause - a function that pauses the processing of tasks
+     * until `resume()` is called. Invoke like `cargo.pause()`.
+     * @property {Function} resume - a function that resumes the processing of
+     * queued tasks when the queue is paused. Invoke like `cargo.resume()`.
+     * @property {Function} kill - a function that removes the `drain` callback and
+     * empties remaining tasks from the queue forcing it to go idle. Invoke like `cargo.kill()`.
+     */
+
+    /**
+     * Creates a `cargo` object with the specified payload. Tasks added to the
+     * cargo will be processed altogether (up to the `payload` limit). If the
+     * `worker` is in progress, the task is queued until it becomes available. Once
+     * the `worker` has completed some tasks, each callback of those tasks is
+     * called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
+     * for how `cargo` and `queue` work.
+     *
+     * While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
+     * at a time, cargo passes an array of tasks to a single worker, repeating
+     * when the worker is finished.
+     *
+     * @name cargo
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.queue]{@link module:ControlFlow.queue}
+     * @category Control Flow
+     * @param {AsyncFunction} worker - An asynchronous function for processing an array
+     * of queued tasks. Invoked with `(tasks, callback)`.
+     * @param {number} [payload=Infinity] - An optional `integer` for determining
+     * how many tasks should be processed per round; if omitted, the default is
+     * unlimited.
+     * @returns {module:ControlFlow.CargoObject} A cargo object to manage the tasks. Callbacks can
+     * attached as certain properties to listen for specific events during the
+     * lifecycle of the cargo and inner queue.
+     * @example
+     *
+     * // create a cargo object with payload 2
+     * var cargo = async.cargo(function(tasks, callback) {
+     *     for (var i=0; i<tasks.length; i++) {
+     *         console.log('hello ' + tasks[i].name);
+     *     }
+     *     callback();
+     * }, 2);
+     *
+     * // add some items
+     * cargo.push({name: 'foo'}, function(err) {
+     *     console.log('finished processing foo');
+     * });
+     * cargo.push({name: 'bar'}, function(err) {
+     *     console.log('finished processing bar');
+     * });
+     * cargo.push({name: 'baz'}, function(err) {
+     *     console.log('finished processing baz');
+     * });
+     */
+    function cargo(worker, payload) {
+        return queue(worker, 1, payload);
+    }
+
+    /**
+     * Creates a `cargoQueue` object with the specified payload. Tasks added to the
+     * cargoQueue will be processed together (up to the `payload` limit) in `concurrency` parallel workers.
+     * If the all `workers` are in progress, the task is queued until one becomes available. Once
+     * a `worker` has completed some tasks, each callback of those tasks is
+     * called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
+     * for how `cargo` and `queue` work.
+     *
+     * While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
+     * at a time, and [`cargo`]{@link module:ControlFlow.cargo} passes an array of tasks to a single worker,
+     * the cargoQueue passes an array of tasks to multiple parallel workers.
+     *
+     * @name cargoQueue
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.queue]{@link module:ControlFlow.queue}
+     * @see [async.cargo]{@link module:ControlFLow.cargo}
+     * @category Control Flow
+     * @param {AsyncFunction} worker - An asynchronous function for processing an array
+     * of queued tasks. Invoked with `(tasks, callback)`.
+     * @param {number} [concurrency=1] - An `integer` for determining how many
+     * `worker` functions should be run in parallel.  If omitted, the concurrency
+     * defaults to `1`.  If the concurrency is `0`, an error is thrown.
+     * @param {number} [payload=Infinity] - An optional `integer` for determining
+     * how many tasks should be processed per round; if omitted, the default is
+     * unlimited.
+     * @returns {module:ControlFlow.CargoObject} A cargoQueue object to manage the tasks. Callbacks can
+     * attached as certain properties to listen for specific events during the
+     * lifecycle of the cargoQueue and inner queue.
+     * @example
+     *
+     * // create a cargoQueue object with payload 2 and concurrency 2
+     * var cargoQueue = async.cargoQueue(function(tasks, callback) {
+     *     for (var i=0; i<tasks.length; i++) {
+     *         console.log('hello ' + tasks[i].name);
+     *     }
+     *     callback();
+     * }, 2, 2);
+     *
+     * // add some items
+     * cargoQueue.push({name: 'foo'}, function(err) {
+     *     console.log('finished processing foo');
+     * });
+     * cargoQueue.push({name: 'bar'}, function(err) {
+     *     console.log('finished processing bar');
+     * });
+     * cargoQueue.push({name: 'baz'}, function(err) {
+     *     console.log('finished processing baz');
+     * });
+     * cargoQueue.push({name: 'boo'}, function(err) {
+     *     console.log('finished processing boo');
+     * });
+     */
+    function cargo$1(worker, concurrency, payload) {
+        return queue(worker, concurrency, payload);
+    }
+
+    /**
+     * Reduces `coll` into a single value using an async `iteratee` to return each
+     * successive step. `memo` is the initial state of the reduction. This function
+     * only operates in series.
+     *
+     * For performance reasons, it may make sense to split a call to this function
+     * into a parallel map, and then use the normal `Array.prototype.reduce` on the
+     * results. This function is for situations where each step in the reduction
+     * needs to be async; if you can get the data before reducing it, then it's
+     * probably a good idea to do so.
+     *
+     * @name reduce
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @alias inject
+     * @alias foldl
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {*} memo - The initial state of the reduction.
+     * @param {AsyncFunction} iteratee - A function applied to each item in the
+     * array to produce the next step in the reduction.
+     * The `iteratee` should complete with the next state of the reduction.
+     * If the iteratee complete with an error, the reduction is stopped and the
+     * main `callback` is immediately called with the error.
+     * Invoked with (memo, item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result is the reduced value. Invoked with
+     * (err, result).
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     *
+     * async.reduce([1,2,3], 0, function(memo, item, callback) {
+     *     // pointless async:
+     *     process.nextTick(function() {
+     *         callback(null, memo + item)
+     *     });
+     * }, function(err, result) {
+     *     // result is now equal to the last value of memo, which is 6
+     * });
+     */
+    function reduce(coll, memo, iteratee, callback) {
+        callback = once(callback);
+        var _iteratee = wrapAsync(iteratee);
+        return eachOfSeries$1(coll, (x, i, iterCb) => {
+            _iteratee(memo, x, (err, v) => {
+                memo = v;
+                iterCb(err);
             });
-        }, function(err) {
-            if (err) {
-                cb(err);
+        }, err => callback(err, memo));
+    }
+    var reduce$1 = awaitify(reduce, 4);
+
+    /**
+     * Version of the compose function that is more natural to read. Each function
+     * consumes the return value of the previous function. It is the equivalent of
+     * [compose]{@link module:ControlFlow.compose} with the arguments reversed.
+     *
+     * Each function is executed with the `this` binding of the composed function.
+     *
+     * @name seq
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.compose]{@link module:ControlFlow.compose}
+     * @category Control Flow
+     * @param {...AsyncFunction} functions - the asynchronous functions to compose
+     * @returns {Function} a function that composes the `functions` in order
+     * @example
+     *
+     * // Requires lodash (or underscore), express3 and dresende's orm2.
+     * // Part of an app, that fetches cats of the logged user.
+     * // This example uses `seq` function to avoid overnesting and error
+     * // handling clutter.
+     * app.get('/cats', function(request, response) {
+     *     var User = request.models.User;
+     *     async.seq(
+     *         _.bind(User.get, User),  // 'User.get' has signature (id, callback(err, data))
+     *         function(user, fn) {
+     *             user.getCats(fn);      // 'getCats' has signature (callback(err, data))
+     *         }
+     *     )(req.session.user_id, function (err, cats) {
+     *         if (err) {
+     *             console.error(err);
+     *             response.json({ status: 'error', message: err.message });
+     *         } else {
+     *             response.json({ status: 'ok', message: 'Cats found', data: cats });
+     *         }
+     *     });
+     * });
+     */
+    function seq(...functions) {
+        var _functions = functions.map(wrapAsync);
+        return function (...args) {
+            var that = this;
+
+            var cb = args[args.length - 1];
+            if (typeof cb == 'function') {
+                args.pop();
             } else {
-                cb(null, testPassed ? testResult : getResult(false));
+                cb = promiseCallback();
+            }
+
+            reduce$1(_functions, args, (newargs, fn, iterCb) => {
+                fn.apply(that, newargs.concat((err, ...nextargs) => {
+                    iterCb(err, nextargs);
+                }));
+            },
+            (err, results) => cb(err, ...results));
+
+            return cb[PROMISE_SYMBOL]
+        };
+    }
+
+    /**
+     * Creates a function which is a composition of the passed asynchronous
+     * functions. Each function consumes the return value of the function that
+     * follows. Composing functions `f()`, `g()`, and `h()` would produce the result
+     * of `f(g(h()))`, only this version uses callbacks to obtain the return values.
+     *
+     * If the last argument to the composed function is not a function, a promise
+     * is returned when you call it.
+     *
+     * Each function is executed with the `this` binding of the composed function.
+     *
+     * @name compose
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {...AsyncFunction} functions - the asynchronous functions to compose
+     * @returns {Function} an asynchronous function that is the composed
+     * asynchronous `functions`
+     * @example
+     *
+     * function add1(n, callback) {
+     *     setTimeout(function () {
+     *         callback(null, n + 1);
+     *     }, 10);
+     * }
+     *
+     * function mul3(n, callback) {
+     *     setTimeout(function () {
+     *         callback(null, n * 3);
+     *     }, 10);
+     * }
+     *
+     * var add1mul3 = async.compose(mul3, add1);
+     * add1mul3(4, function (err, result) {
+     *     // result now equals 15
+     * });
+     */
+    function compose(...args) {
+        return seq(...args.reverse());
+    }
+
+    /**
+     * The same as [`map`]{@link module:Collections.map} but runs a maximum of `limit` async operations at a time.
+     *
+     * @name mapLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.map]{@link module:Collections.map}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The iteratee should complete with the transformed item.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Results is an array of the
+     * transformed items from the `coll`. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function mapLimit (coll, limit, iteratee, callback) {
+        return _asyncMap(eachOfLimit(limit), coll, iteratee, callback)
+    }
+    var mapLimit$1 = awaitify(mapLimit, 4);
+
+    /**
+     * The same as [`concat`]{@link module:Collections.concat} but runs a maximum of `limit` async operations at a time.
+     *
+     * @name concatLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.concat]{@link module:Collections.concat}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
+     * which should use an array as its result. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished, or an error occurs. Results is an array
+     * containing the concatenated results of the `iteratee` function. Invoked with
+     * (err, results).
+     * @returns A Promise, if no callback is passed
+     */
+    function concatLimit(coll, limit, iteratee, callback) {
+        var _iteratee = wrapAsync(iteratee);
+        return mapLimit$1(coll, limit, (val, iterCb) => {
+            _iteratee(val, (err, ...args) => {
+                if (err) return iterCb(err);
+                return iterCb(null, args);
+            });
+        }, (err, mapResults) => {
+            var result = [];
+            for (var i = 0; i < mapResults.length; i++) {
+                if (mapResults[i]) {
+                    result = result.concat(...mapResults[i]);
+                }
             }
+
+            return callback(err, result);
         });
-    };
-}
-
-function _findGetResult(v, x) {
-    return x;
-}
-
-/**
- * Returns the first value in `coll` that passes an async truth test. The
- * `iteratee` is applied in parallel, meaning the first iteratee to return
- * `true` will fire the detect `callback` with that result. That means the
- * result might not be the first item in the original `coll` (in terms of order)
- * that passes the test.
-
- * If order within the original `coll` is important, then look at
- * [`detectSeries`]{@link module:Collections.detectSeries}.
- *
- * @name detect
- * @static
- * @memberOf module:Collections
- * @method
- * @alias find
- * @category Collections
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
- * The iteratee must complete with a boolean value as its result.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called as soon as any
- * iteratee returns `true`, or after all the `iteratee` functions have finished.
- * Result will be the first item in the array that passes the truth test
- * (iteratee) or the value `undefined` if none passed. Invoked with
- * (err, result).
- * @example
- *
- * async.detect(['file1','file2','file3'], function(filePath, callback) {
- *     fs.access(filePath, function(err) {
- *         callback(null, !err)
- *     });
- * }, function(err, result) {
- *     // result now equals the first file in the list that exists
- * });
- */
-var detect = doParallel(_createTester(identity, _findGetResult));
-
-/**
- * The same as [`detect`]{@link module:Collections.detect} but runs a maximum of `limit` async operations at a
- * time.
- *
- * @name detectLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.detect]{@link module:Collections.detect}
- * @alias findLimit
- * @category Collections
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
- * The iteratee must complete with a boolean value as its result.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called as soon as any
- * iteratee returns `true`, or after all the `iteratee` functions have finished.
- * Result will be the first item in the array that passes the truth test
- * (iteratee) or the value `undefined` if none passed. Invoked with
- * (err, result).
- */
-var detectLimit = doParallelLimit(_createTester(identity, _findGetResult));
-
-/**
- * The same as [`detect`]{@link module:Collections.detect} but runs only a single async operation at a time.
- *
- * @name detectSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.detect]{@link module:Collections.detect}
- * @alias findSeries
- * @category Collections
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
- * The iteratee must complete with a boolean value as its result.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called as soon as any
- * iteratee returns `true`, or after all the `iteratee` functions have finished.
- * Result will be the first item in the array that passes the truth test
- * (iteratee) or the value `undefined` if none passed. Invoked with
- * (err, result).
- */
-var detectSeries = doLimit(detectLimit, 1);
-
-function consoleFunc(name) {
-    return function (fn/*, ...args*/) {
-        var args = slice(arguments, 1);
-        args.push(function (err/*, ...args*/) {
-            var args = slice(arguments, 1);
+    }
+    var concatLimit$1 = awaitify(concatLimit, 4);
+
+    /**
+     * Applies `iteratee` to each item in `coll`, concatenating the results. Returns
+     * the concatenated list. The `iteratee`s are called in parallel, and the
+     * results are concatenated as they return. The results array will be returned in
+     * the original order of `coll` passed to the `iteratee` function.
+     *
+     * @name concat
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
+     * which should use an array as its result. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished, or an error occurs. Results is an array
+     * containing the concatenated results of the `iteratee` function. Invoked with
+     * (err, results).
+     * @returns A Promise, if no callback is passed
+     * @example
+     *
+     * async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
+     *     // files is now a list of filenames that exist in the 3 directories
+     * });
+     */
+    function concat(coll, iteratee, callback) {
+        return concatLimit$1(coll, Infinity, iteratee, callback)
+    }
+    var concat$1 = awaitify(concat, 3);
+
+    /**
+     * The same as [`concat`]{@link module:Collections.concat} but runs only a single async operation at a time.
+     *
+     * @name concatSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.concat]{@link module:Collections.concat}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`.
+     * The iteratee should complete with an array an array of results.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished, or an error occurs. Results is an array
+     * containing the concatenated results of the `iteratee` function. Invoked with
+     * (err, results).
+     * @returns A Promise, if no callback is passed
+     */
+    function concatSeries(coll, iteratee, callback) {
+        return concatLimit$1(coll, 1, iteratee, callback)
+    }
+    var concatSeries$1 = awaitify(concatSeries, 3);
+
+    /**
+     * Returns a function that when called, calls-back with the values provided.
+     * Useful as the first function in a [`waterfall`]{@link module:ControlFlow.waterfall}, or for plugging values in to
+     * [`auto`]{@link module:ControlFlow.auto}.
+     *
+     * @name constant
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {...*} arguments... - Any number of arguments to automatically invoke
+     * callback with.
+     * @returns {AsyncFunction} Returns a function that when invoked, automatically
+     * invokes the callback with the previous given arguments.
+     * @example
+     *
+     * async.waterfall([
+     *     async.constant(42),
+     *     function (value, next) {
+     *         // value === 42
+     *     },
+     *     //...
+     * ], callback);
+     *
+     * async.waterfall([
+     *     async.constant(filename, "utf8"),
+     *     fs.readFile,
+     *     function (fileData, next) {
+     *         //...
+     *     }
+     *     //...
+     * ], callback);
+     *
+     * async.auto({
+     *     hostname: async.constant("https://server.net/"),
+     *     port: findFreePort,
+     *     launchServer: ["hostname", "port", function (options, cb) {
+     *         startServer(options, cb);
+     *     }],
+     *     //...
+     * }, callback);
+     */
+    function constant(...args) {
+        return function (...ignoredArgs/*, callback*/) {
+            var callback = ignoredArgs.pop();
+            return callback(null, ...args);
+        };
+    }
+
+    function _createTester(check, getResult) {
+        return (eachfn, arr, _iteratee, cb) => {
+            var testPassed = false;
+            var testResult;
+            const iteratee = wrapAsync(_iteratee);
+            eachfn(arr, (value, _, callback) => {
+                iteratee(value, (err, result) => {
+                    if (err) return callback(err)
+
+                    if (check(result) && !testResult) {
+                        testPassed = true;
+                        testResult = getResult(true, value);
+                        return callback(null, breakLoop);
+                    }
+                    callback();
+                });
+            }, err => {
+                if (err) return cb(err);
+                cb(null, testPassed ? testResult : getResult(false));
+            });
+        };
+    }
+
+    /**
+     * Returns the first value in `coll` that passes an async truth test. The
+     * `iteratee` is applied in parallel, meaning the first iteratee to return
+     * `true` will fire the detect `callback` with that result. That means the
+     * result might not be the first item in the original `coll` (in terms of order)
+     * that passes the test.
+
+     * If order within the original `coll` is important, then look at
+     * [`detectSeries`]{@link module:Collections.detectSeries}.
+     *
+     * @name detect
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @alias find
+     * @category Collections
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
+     * The iteratee must complete with a boolean value as its result.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the `iteratee` functions have finished.
+     * Result will be the first item in the array that passes the truth test
+     * (iteratee) or the value `undefined` if none passed. Invoked with
+     * (err, result).
+     * @returns A Promise, if no callback is passed
+     * @example
+     *
+     * async.detect(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, result) {
+     *     // result now equals the first file in the list that exists
+     * });
+     */
+    function detect(coll, iteratee, callback) {
+        return _createTester(bool => bool, (res, item) => item)(eachOf$1, coll, iteratee, callback)
+    }
+    var detect$1 = awaitify(detect, 3);
+
+    /**
+     * The same as [`detect`]{@link module:Collections.detect} but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name detectLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.detect]{@link module:Collections.detect}
+     * @alias findLimit
+     * @category Collections
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
+     * The iteratee must complete with a boolean value as its result.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the `iteratee` functions have finished.
+     * Result will be the first item in the array that passes the truth test
+     * (iteratee) or the value `undefined` if none passed. Invoked with
+     * (err, result).
+     * @returns a Promise if no callback is passed
+     */
+    function detectLimit(coll, limit, iteratee, callback) {
+        return _createTester(bool => bool, (res, item) => item)(eachOfLimit(limit), coll, iteratee, callback)
+    }
+    var detectLimit$1 = awaitify(detectLimit, 4);
+
+    /**
+     * The same as [`detect`]{@link module:Collections.detect} but runs only a single async operation at a time.
+     *
+     * @name detectSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.detect]{@link module:Collections.detect}
+     * @alias findSeries
+     * @category Collections
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
+     * The iteratee must complete with a boolean value as its result.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the `iteratee` functions have finished.
+     * Result will be the first item in the array that passes the truth test
+     * (iteratee) or the value `undefined` if none passed. Invoked with
+     * (err, result).
+     * @returns a Promise if no callback is passed
+     */
+    function detectSeries(coll, iteratee, callback) {
+        return _createTester(bool => bool, (res, item) => item)(eachOfLimit(1), coll, iteratee, callback)
+    }
+
+    var detectSeries$1 = awaitify(detectSeries, 3);
+
+    function consoleFunc(name) {
+        return (fn, ...args) => wrapAsync(fn)(...args, (err, ...resultArgs) => {
             if (typeof console === 'object') {
                 if (err) {
                     if (console.error) {
                         console.error(err);
                     }
                 } else if (console[name]) {
-                    arrayEach(args, function (x) {
-                        console[name](x);
-                    });
+                    resultArgs.forEach(x => console[name](x));
                 }
             }
-        });
-        wrapAsync(fn).apply(null, args);
-    };
-}
-
-/**
- * Logs the result of an [`async` function]{@link AsyncFunction} to the
- * `console` using `console.dir` to display the properties of the resulting object.
- * Only works in Node.js or in browsers that support `console.dir` and
- * `console.error` (such as FF and Chrome).
- * If multiple arguments are returned from the async function,
- * `console.dir` is called on each argument in order.
- *
- * @name dir
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {AsyncFunction} function - The function you want to eventually apply
- * all arguments to.
- * @param {...*} arguments... - Any number of arguments to apply to the function.
- * @example
- *
- * // in a module
- * var hello = function(name, callback) {
- *     setTimeout(function() {
- *         callback(null, {hello: name});
- *     }, 1000);
- * };
- *
- * // in the node repl
- * node> async.dir(hello, 'world');
- * {hello: 'world'}
- */
-var dir = consoleFunc('dir');
-
-/**
- * The post-check version of [`during`]{@link module:ControlFlow.during}. To reflect the difference in
- * the order of operations, the arguments `test` and `fn` are switched.
- *
- * Also a version of [`doWhilst`]{@link module:ControlFlow.doWhilst} with asynchronous `test` function.
- * @name doDuring
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.during]{@link module:ControlFlow.during}
- * @category Control Flow
- * @param {AsyncFunction} fn - An async function which is called each time
- * `test` passes. Invoked with (callback).
- * @param {AsyncFunction} test - asynchronous truth test to perform before each
- * execution of `fn`. Invoked with (...args, callback), where `...args` are the
- * non-error args from the previous callback of `fn`.
- * @param {Function} [callback] - A callback which is called after the test
- * function has failed and repeated execution of `fn` has stopped. `callback`
- * will be passed an error if one occurred, otherwise `null`.
- */
-function doDuring(fn, test, callback) {
-    callback = onlyOnce(callback || noop);
-    var _fn = wrapAsync(fn);
-    var _test = wrapAsync(test);
-
-    function next(err/*, ...args*/) {
-        if (err) return callback(err);
-        var args = slice(arguments, 1);
-        args.push(check);
-        _test.apply(this, args);
+        })
     }
 
-    function check(err, truth) {
-        if (err) return callback(err);
-        if (!truth) return callback(null);
-        _fn(next);
+    /**
+     * Logs the result of an [`async` function]{@link AsyncFunction} to the
+     * `console` using `console.dir` to display the properties of the resulting object.
+     * Only works in Node.js or in browsers that support `console.dir` and
+     * `console.error` (such as FF and Chrome).
+     * If multiple arguments are returned from the async function,
+     * `console.dir` is called on each argument in order.
+     *
+     * @name dir
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {AsyncFunction} function - The function you want to eventually apply
+     * all arguments to.
+     * @param {...*} arguments... - Any number of arguments to apply to the function.
+     * @example
+     *
+     * // in a module
+     * var hello = function(name, callback) {
+     *     setTimeout(function() {
+     *         callback(null, {hello: name});
+     *     }, 1000);
+     * };
+     *
+     * // in the node repl
+     * node> async.dir(hello, 'world');
+     * {hello: 'world'}
+     */
+    var dir = consoleFunc('dir');
+
+    /**
+     * The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
+     * the order of operations, the arguments `test` and `iteratee` are switched.
+     *
+     * `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
+     *
+     * @name doWhilst
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.whilst]{@link module:ControlFlow.whilst}
+     * @category Control Flow
+     * @param {AsyncFunction} iteratee - A function which is called each time `test`
+     * passes. Invoked with (callback).
+     * @param {AsyncFunction} test - asynchronous truth test to perform after each
+     * execution of `iteratee`. Invoked with (...args, callback), where `...args` are the
+     * non-error args from the previous callback of `iteratee`.
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has failed and repeated execution of `iteratee` has stopped.
+     * `callback` will be passed an error and any arguments passed to the final
+     * `iteratee`'s callback. Invoked with (err, [results]);
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function doWhilst(iteratee, test, callback) {
+        callback = onlyOnce(callback);
+        var _fn = wrapAsync(iteratee);
+        var _test = wrapAsync(test);
+        var results;
+
+        function next(err, ...args) {
+            if (err) return callback(err);
+            if (err === false) return;
+            results = args;
+            _test(...args, check);
+        }
+
+        function check(err, truth) {
+            if (err) return callback(err);
+            if (err === false) return;
+            if (!truth) return callback(null, ...results);
+            _fn(next);
+        }
+
+        return check(null, true);
     }
 
-    check(null, true);
-
-}
-
-/**
- * The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
- * the order of operations, the arguments `test` and `iteratee` are switched.
- *
- * `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
- *
- * @name doWhilst
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.whilst]{@link module:ControlFlow.whilst}
- * @category Control Flow
- * @param {AsyncFunction} iteratee - A function which is called each time `test`
- * passes. Invoked with (callback).
- * @param {Function} test - synchronous truth test to perform after each
- * execution of `iteratee`. Invoked with any non-error callback results of
- * `iteratee`.
- * @param {Function} [callback] - A callback which is called after the test
- * function has failed and repeated execution of `iteratee` has stopped.
- * `callback` will be passed an error and any arguments passed to the final
- * `iteratee`'s callback. Invoked with (err, [results]);
- */
-function doWhilst(iteratee, test, callback) {
-    callback = onlyOnce(callback || noop);
-    var _iteratee = wrapAsync(iteratee);
-    var next = function(err/*, ...args*/) {
-        if (err) return callback(err);
-        var args = slice(arguments, 1);
-        if (test.apply(this, args)) return _iteratee(next);
-        callback.apply(null, [null].concat(args));
-    };
-    _iteratee(next);
-}
-
-/**
- * Like ['doWhilst']{@link module:ControlFlow.doWhilst}, except the `test` is inverted. Note the
- * argument ordering differs from `until`.
- *
- * @name doUntil
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.doWhilst]{@link module:ControlFlow.doWhilst}
- * @category Control Flow
- * @param {AsyncFunction} iteratee - An async function which is called each time
- * `test` fails. Invoked with (callback).
- * @param {Function} test - synchronous truth test to perform after each
- * execution of `iteratee`. Invoked with any non-error callback results of
- * `iteratee`.
- * @param {Function} [callback] - A callback which is called after the test
- * function has passed and repeated execution of `iteratee` has stopped. `callback`
- * will be passed an error and any arguments passed to the final `iteratee`'s
- * callback. Invoked with (err, [results]);
- */
-function doUntil(iteratee, test, callback) {
-    doWhilst(iteratee, function() {
-        return !test.apply(this, arguments);
-    }, callback);
-}
-
-/**
- * Like [`whilst`]{@link module:ControlFlow.whilst}, except the `test` is an asynchronous function that
- * is passed a callback in the form of `function (err, truth)`. If error is
- * passed to `test` or `fn`, the main callback is immediately called with the
- * value of the error.
- *
- * @name during
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.whilst]{@link module:ControlFlow.whilst}
- * @category Control Flow
- * @param {AsyncFunction} test - asynchronous truth test to perform before each
- * execution of `fn`. Invoked with (callback).
- * @param {AsyncFunction} fn - An async function which is called each time
- * `test` passes. Invoked with (callback).
- * @param {Function} [callback] - A callback which is called after the test
- * function has failed and repeated execution of `fn` has stopped. `callback`
- * will be passed an error, if one occurred, otherwise `null`.
- * @example
- *
- * var count = 0;
- *
- * async.during(
- *     function (callback) {
- *         return callback(null, count < 5);
- *     },
- *     function (callback) {
- *         count++;
- *         setTimeout(callback, 1000);
- *     },
- *     function (err) {
- *         // 5 seconds have passed
- *     }
- * );
- */
-function during(test, fn, callback) {
-    callback = onlyOnce(callback || noop);
-    var _fn = wrapAsync(fn);
-    var _test = wrapAsync(test);
-
-    function next(err) {
-        if (err) return callback(err);
-        _test(check);
+    var doWhilst$1 = awaitify(doWhilst, 3);
+
+    /**
+     * Like ['doWhilst']{@link module:ControlFlow.doWhilst}, except the `test` is inverted. Note the
+     * argument ordering differs from `until`.
+     *
+     * @name doUntil
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.doWhilst]{@link module:ControlFlow.doWhilst}
+     * @category Control Flow
+     * @param {AsyncFunction} iteratee - An async function which is called each time
+     * `test` fails. Invoked with (callback).
+     * @param {AsyncFunction} test - asynchronous truth test to perform after each
+     * execution of `iteratee`. Invoked with (...args, callback), where `...args` are the
+     * non-error args from the previous callback of `iteratee`
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has passed and repeated execution of `iteratee` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `iteratee`'s
+     * callback. Invoked with (err, [results]);
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function doUntil(iteratee, test, callback) {
+        const _test = wrapAsync(test);
+        return doWhilst$1(iteratee, (...args) => {
+            const cb = args.pop();
+            _test(...args, (err, truth) => cb (err, !truth));
+        }, callback);
     }
 
-    function check(err, truth) {
-        if (err) return callback(err);
-        if (!truth) return callback(null);
-        _fn(next);
+    function _withoutIndex(iteratee) {
+        return (value, index, callback) => iteratee(value, callback);
     }
 
-    _test(check);
-}
+    /**
+     * Applies the function `iteratee` to each item in `coll`, in parallel.
+     * The `iteratee` is called with an item from the list, and a callback for when
+     * it has finished. If the `iteratee` passes an error to its `callback`, the
+     * main `callback` (for the `each` function) is immediately called with the
+     * error.
+     *
+     * Note, that since this function applies `iteratee` to each item in parallel,
+     * there is no guarantee that the iteratee functions will complete in order.
+     *
+     * @name each
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @alias forEach
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to
+     * each item in `coll`. Invoked with (item, callback).
+     * The array index is not passed to the iteratee.
+     * If you need the index, use `eachOf`.
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     * @returns {Promise} a promise, if a callback is omitted
+     * @example
+     *
+     * // assuming openFiles is an array of file names and saveFile is a function
+     * // to save the modified contents of that file:
+     *
+     * async.each(openFiles, saveFile, function(err){
+     *   // if any of the saves produced an error, err would equal that error
+     * });
+     *
+     * // assuming openFiles is an array of file names
+     * async.each(openFiles, function(file, callback) {
+     *
+     *     // Perform operation on file here.
+     *     console.log('Processing file ' + file);
+     *
+     *     if( file.length > 32 ) {
+     *       console.log('This file name is too long');
+     *       callback('File name too long');
+     *     } else {
+     *       // Do work to process file here
+     *       console.log('File processed');
+     *       callback();
+     *     }
+     * }, function(err) {
+     *     // if any of the file processing produced an error, err would equal that error
+     *     if( err ) {
+     *       // One of the iterations produced an error.
+     *       // All processing will now stop.
+     *       console.log('A file failed to process');
+     *     } else {
+     *       console.log('All files have been processed successfully');
+     *     }
+     * });
+     */
+    function eachLimit(coll, iteratee, callback) {
+        return eachOf$1(coll, _withoutIndex(wrapAsync(iteratee)), callback);
+    }
 
-function _withoutIndex(iteratee) {
-    return function (value, index, callback) {
-        return iteratee(value, callback);
-    };
-}
-
-/**
- * Applies the function `iteratee` to each item in `coll`, in parallel.
- * The `iteratee` is called with an item from the list, and a callback for when
- * it has finished. If the `iteratee` passes an error to its `callback`, the
- * main `callback` (for the `each` function) is immediately called with the
- * error.
- *
- * Note, that since this function applies `iteratee` to each item in parallel,
- * there is no guarantee that the iteratee functions will complete in order.
- *
- * @name each
- * @static
- * @memberOf module:Collections
- * @method
- * @alias forEach
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async function to apply to
- * each item in `coll`. Invoked with (item, callback).
- * The array index is not passed to the iteratee.
- * If you need the index, use `eachOf`.
- * @param {Function} [callback] - A callback which is called when all
- * `iteratee` functions have finished, or an error occurs. Invoked with (err).
- * @example
- *
- * // assuming openFiles is an array of file names and saveFile is a function
- * // to save the modified contents of that file:
- *
- * async.each(openFiles, saveFile, function(err){
- *   // if any of the saves produced an error, err would equal that error
- * });
- *
- * // assuming openFiles is an array of file names
- * async.each(openFiles, function(file, callback) {
- *
- *     // Perform operation on file here.
- *     console.log('Processing file ' + file);
- *
- *     if( file.length > 32 ) {
- *       console.log('This file name is too long');
- *       callback('File name too long');
- *     } else {
- *       // Do work to process file here
- *       console.log('File processed');
- *       callback();
- *     }
- * }, function(err) {
- *     // if any of the file processing produced an error, err would equal that error
- *     if( err ) {
- *       // One of the iterations produced an error.
- *       // All processing will now stop.
- *       console.log('A file failed to process');
- *     } else {
- *       console.log('All files have been processed successfully');
- *     }
- * });
- */
-function eachLimit(coll, iteratee, callback) {
-    eachOf(coll, _withoutIndex(wrapAsync(iteratee)), callback);
-}
-
-/**
- * The same as [`each`]{@link module:Collections.each} but runs a maximum of `limit` async operations at a time.
- *
- * @name eachLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.each]{@link module:Collections.each}
- * @alias forEachLimit
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The array index is not passed to the iteratee.
- * If you need the index, use `eachOfLimit`.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called when all
- * `iteratee` functions have finished, or an error occurs. Invoked with (err).
- */
-function eachLimit$1(coll, limit, iteratee, callback) {
-    _eachOfLimit(limit)(coll, _withoutIndex(wrapAsync(iteratee)), callback);
-}
-
-/**
- * The same as [`each`]{@link module:Collections.each} but runs only a single async operation at a time.
- *
- * @name eachSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.each]{@link module:Collections.each}
- * @alias forEachSeries
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async function to apply to each
- * item in `coll`.
- * The array index is not passed to the iteratee.
- * If you need the index, use `eachOfSeries`.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called when all
- * `iteratee` functions have finished, or an error occurs. Invoked with (err).
- */
-var eachSeries = doLimit(eachLimit$1, 1);
-
-/**
- * Wrap an async function and ensure it calls its callback on a later tick of
- * the event loop.  If the function already calls its callback on a next tick,
- * no extra deferral is added. This is useful for preventing stack overflows
- * (`RangeError: Maximum call stack size exceeded`) and generally keeping
- * [Zalgo](http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony)
- * contained. ES2017 `async` functions are returned as-is -- they are immune
- * to Zalgo's corrupting influences, as they always resolve on a later tick.
- *
- * @name ensureAsync
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {AsyncFunction} fn - an async function, one that expects a node-style
- * callback as its last argument.
- * @returns {AsyncFunction} Returns a wrapped function with the exact same call
- * signature as the function passed in.
- * @example
- *
- * function sometimesAsync(arg, callback) {
- *     if (cache[arg]) {
- *         return callback(null, cache[arg]); // this would be synchronous!!
- *     } else {
- *         doSomeIO(arg, callback); // this IO would be asynchronous
- *     }
- * }
- *
- * // this has a risk of stack overflows if many results are cached in a row
- * async.mapSeries(args, sometimesAsync, done);
- *
- * // this will defer sometimesAsync's callback if necessary,
- * // preventing stack overflows
- * async.mapSeries(args, async.ensureAsync(sometimesAsync), done);
- */
-function ensureAsync(fn) {
-    if (isAsync(fn)) return fn;
-    return initialParams(function (args, callback) {
-        var sync = true;
-        args.push(function () {
-            var innerArgs = arguments;
-            if (sync) {
-                setImmediate$1(function () {
-                    callback.apply(null, innerArgs);
-                });
-            } else {
-                callback.apply(null, innerArgs);
+    var each = awaitify(eachLimit, 3);
+
+    /**
+     * The same as [`each`]{@link module:Collections.each} but runs a maximum of `limit` async operations at a time.
+     *
+     * @name eachLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.each]{@link module:Collections.each}
+     * @alias forEachLimit
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The array index is not passed to the iteratee.
+     * If you need the index, use `eachOfLimit`.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     * @returns {Promise} a promise, if a callback is omitted
+     */
+    function eachLimit$1(coll, limit, iteratee, callback) {
+        return eachOfLimit(limit)(coll, _withoutIndex(wrapAsync(iteratee)), callback);
+    }
+    var eachLimit$2 = awaitify(eachLimit$1, 4);
+
+    /**
+     * The same as [`each`]{@link module:Collections.each} but runs only a single async operation at a time.
+     *
+     * @name eachSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.each]{@link module:Collections.each}
+     * @alias forEachSeries
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to each
+     * item in `coll`.
+     * The array index is not passed to the iteratee.
+     * If you need the index, use `eachOfSeries`.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called when all
+     * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+     * @returns {Promise} a promise, if a callback is omitted
+     */
+    function eachSeries(coll, iteratee, callback) {
+        return eachLimit$2(coll, 1, iteratee, callback)
+    }
+    var eachSeries$1 = awaitify(eachSeries, 3);
+
+    /**
+     * Wrap an async function and ensure it calls its callback on a later tick of
+     * the event loop.  If the function already calls its callback on a next tick,
+     * no extra deferral is added. This is useful for preventing stack overflows
+     * (`RangeError: Maximum call stack size exceeded`) and generally keeping
+     * [Zalgo](http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony)
+     * contained. ES2017 `async` functions are returned as-is -- they are immune
+     * to Zalgo's corrupting influences, as they always resolve on a later tick.
+     *
+     * @name ensureAsync
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {AsyncFunction} fn - an async function, one that expects a node-style
+     * callback as its last argument.
+     * @returns {AsyncFunction} Returns a wrapped function with the exact same call
+     * signature as the function passed in.
+     * @example
+     *
+     * function sometimesAsync(arg, callback) {
+     *     if (cache[arg]) {
+     *         return callback(null, cache[arg]); // this would be synchronous!!
+     *     } else {
+     *         doSomeIO(arg, callback); // this IO would be asynchronous
+     *     }
+     * }
+     *
+     * // this has a risk of stack overflows if many results are cached in a row
+     * async.mapSeries(args, sometimesAsync, done);
+     *
+     * // this will defer sometimesAsync's callback if necessary,
+     * // preventing stack overflows
+     * async.mapSeries(args, async.ensureAsync(sometimesAsync), done);
+     */
+    function ensureAsync(fn) {
+        if (isAsync(fn)) return fn;
+        return function (...args/*, callback*/) {
+            var callback = args.pop();
+            var sync = true;
+            args.push((...innerArgs) => {
+                if (sync) {
+                    setImmediate$1(() => callback(...innerArgs));
+                } else {
+                    callback(...innerArgs);
+                }
+            });
+            fn.apply(this, args);
+            sync = false;
+        };
+    }
+
+    /**
+     * Returns `true` if every element in `coll` satisfies an async test. If any
+     * iteratee call returns `false`, the main `callback` is immediately called.
+     *
+     * @name every
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @alias all
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async truth test to apply to each item
+     * in the collection in parallel.
+     * The iteratee must complete with a boolean result value.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result will be either `true` or `false`
+     * depending on the values of the async tests. Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback provided
+     * @example
+     *
+     * async.every(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, result) {
+     *     // if result is true then every file exists
+     * });
+     */
+    function every(coll, iteratee, callback) {
+        return _createTester(bool => !bool, res => !res)(eachOf$1, coll, iteratee, callback)
+    }
+    var every$1 = awaitify(every, 3);
+
+    /**
+     * The same as [`every`]{@link module:Collections.every} but runs a maximum of `limit` async operations at a time.
+     *
+     * @name everyLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.every]{@link module:Collections.every}
+     * @alias allLimit
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - An async truth test to apply to each item
+     * in the collection in parallel.
+     * The iteratee must complete with a boolean result value.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result will be either `true` or `false`
+     * depending on the values of the async tests. Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback provided
+     */
+    function everyLimit(coll, limit, iteratee, callback) {
+        return _createTester(bool => !bool, res => !res)(eachOfLimit(limit), coll, iteratee, callback)
+    }
+    var everyLimit$1 = awaitify(everyLimit, 4);
+
+    /**
+     * The same as [`every`]{@link module:Collections.every} but runs only a single async operation at a time.
+     *
+     * @name everySeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.every]{@link module:Collections.every}
+     * @alias allSeries
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async truth test to apply to each item
+     * in the collection in series.
+     * The iteratee must complete with a boolean result value.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result will be either `true` or `false`
+     * depending on the values of the async tests. Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback provided
+     */
+    function everySeries(coll, iteratee, callback) {
+        return _createTester(bool => !bool, res => !res)(eachOfSeries$1, coll, iteratee, callback)
+    }
+    var everySeries$1 = awaitify(everySeries, 3);
+
+    function filterArray(eachfn, arr, iteratee, callback) {
+        var truthValues = new Array(arr.length);
+        eachfn(arr, (x, index, iterCb) => {
+            iteratee(x, (err, v) => {
+                truthValues[index] = !!v;
+                iterCb(err);
+            });
+        }, err => {
+            if (err) return callback(err);
+            var results = [];
+            for (var i = 0; i < arr.length; i++) {
+                if (truthValues[i]) results.push(arr[i]);
             }
+            callback(null, results);
         });
-        fn.apply(this, args);
-        sync = false;
-    });
-}
-
-function notId(v) {
-    return !v;
-}
-
-/**
- * Returns `true` if every element in `coll` satisfies an async test. If any
- * iteratee call returns `false`, the main `callback` is immediately called.
- *
- * @name every
- * @static
- * @memberOf module:Collections
- * @method
- * @alias all
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async truth test to apply to each item
- * in the collection in parallel.
- * The iteratee must complete with a boolean result value.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Result will be either `true` or `false`
- * depending on the values of the async tests. Invoked with (err, result).
- * @example
- *
- * async.every(['file1','file2','file3'], function(filePath, callback) {
- *     fs.access(filePath, function(err) {
- *         callback(null, !err)
- *     });
- * }, function(err, result) {
- *     // if result is true then every file exists
- * });
- */
-var every = doParallel(_createTester(notId, notId));
-
-/**
- * The same as [`every`]{@link module:Collections.every} but runs a maximum of `limit` async operations at a time.
- *
- * @name everyLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.every]{@link module:Collections.every}
- * @alias allLimit
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - An async truth test to apply to each item
- * in the collection in parallel.
- * The iteratee must complete with a boolean result value.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Result will be either `true` or `false`
- * depending on the values of the async tests. Invoked with (err, result).
- */
-var everyLimit = doParallelLimit(_createTester(notId, notId));
-
-/**
- * The same as [`every`]{@link module:Collections.every} but runs only a single async operation at a time.
- *
- * @name everySeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.every]{@link module:Collections.every}
- * @alias allSeries
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async truth test to apply to each item
- * in the collection in series.
- * The iteratee must complete with a boolean result value.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Result will be either `true` or `false`
- * depending on the values of the async tests. Invoked with (err, result).
- */
-var everySeries = doLimit(everyLimit, 1);
-
-/**
- * The base implementation of `_.property` without support for deep paths.
- *
- * @private
- * @param {string} key The key of the property to get.
- * @returns {Function} Returns the new accessor function.
- */
-function baseProperty(key) {
-  return function(object) {
-    return object == null ? undefined : object[key];
-  };
-}
-
-function filterArray(eachfn, arr, iteratee, callback) {
-    var truthValues = new Array(arr.length);
-    eachfn(arr, function (x, index, callback) {
-        iteratee(x, function (err, v) {
-            truthValues[index] = !!v;
-            callback(err);
-        });
-    }, function (err) {
-        if (err) return callback(err);
+    }
+
+    function filterGeneric(eachfn, coll, iteratee, callback) {
         var results = [];
-        for (var i = 0; i < arr.length; i++) {
-            if (truthValues[i]) results.push(arr[i]);
-        }
-        callback(null, results);
-    });
-}
-
-function filterGeneric(eachfn, coll, iteratee, callback) {
-    var results = [];
-    eachfn(coll, function (x, index, callback) {
-        iteratee(x, function (err, v) {
-            if (err) {
-                callback(err);
-            } else {
+        eachfn(coll, (x, index, iterCb) => {
+            iteratee(x, (err, v) => {
+                if (err) return iterCb(err);
                 if (v) {
-                    results.push({index: index, value: x});
+                    results.push({index, value: x});
                 }
-                callback();
-            }
+                iterCb();
+            });
+        }, err => {
+            if (err) return callback(err);
+            callback(null, results
+                .sort((a, b) => a.index - b.index)
+                .map(v => v.value));
         });
-    }, function (err) {
-        if (err) {
-            callback(err);
-        } else {
-            callback(null, arrayMap(results.sort(function (a, b) {
-                return a.index - b.index;
-            }), baseProperty('value')));
+    }
+
+    function _filter(eachfn, coll, iteratee, callback) {
+        var filter = isArrayLike(coll) ? filterArray : filterGeneric;
+        return filter(eachfn, coll, wrapAsync(iteratee), callback);
+    }
+
+    /**
+     * Returns a new array of all the values in `coll` which pass an async truth
+     * test. This operation is performed in parallel, but the results array will be
+     * in the same order as the original.
+     *
+     * @name filter
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @alias select
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback provided
+     * @example
+     *
+     * async.filter(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, results) {
+     *     // results now equals an array of the existing files
+     * });
+     */
+    function filter (coll, iteratee, callback) {
+        return _filter(eachOf$1, coll, iteratee, callback)
+    }
+    var filter$1 = awaitify(filter, 3);
+
+    /**
+     * The same as [`filter`]{@link module:Collections.filter} but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name filterLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.filter]{@link module:Collections.filter}
+     * @alias selectLimit
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback provided
+     */
+    function filterLimit (coll, limit, iteratee, callback) {
+        return _filter(eachOfLimit(limit), coll, iteratee, callback)
+    }
+    var filterLimit$1 = awaitify(filterLimit, 4);
+
+    /**
+     * The same as [`filter`]{@link module:Collections.filter} but runs only a single async operation at a time.
+     *
+     * @name filterSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.filter]{@link module:Collections.filter}
+     * @alias selectSeries
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - A truth test to apply to each item in `coll`.
+     * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+     * with a boolean argument once it has completed. Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results)
+     * @returns {Promise} a promise, if no callback provided
+     */
+    function filterSeries (coll, iteratee, callback) {
+        return _filter(eachOfSeries$1, coll, iteratee, callback)
+    }
+    var filterSeries$1 = awaitify(filterSeries, 3);
+
+    /**
+     * Calls the asynchronous function `fn` with a callback parameter that allows it
+     * to call itself again, in series, indefinitely.
+
+     * If an error is passed to the callback then `errback` is called with the
+     * error, and execution stops, otherwise it will never be called.
+     *
+     * @name forever
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {AsyncFunction} fn - an async function to call repeatedly.
+     * Invoked with (next).
+     * @param {Function} [errback] - when `fn` passes an error to it's callback,
+     * this function will be called, and execution stops. Invoked with (err).
+     * @returns {Promise} a promise that rejects if an error occurs and an errback
+     * is not passed
+     * @example
+     *
+     * async.forever(
+     *     function(next) {
+     *         // next is suitable for passing to things that need a callback(err [, whatever]);
+     *         // it will result in this function being called again.
+     *     },
+     *     function(err) {
+     *         // if next is called with a value in its first parameter, it will appear
+     *         // in here as 'err', and execution will stop.
+     *     }
+     * );
+     */
+    function forever(fn, errback) {
+        var done = onlyOnce(errback);
+        var task = wrapAsync(ensureAsync(fn));
+
+        function next(err) {
+            if (err) return done(err);
+            if (err === false) return;
+            task(next);
         }
-    });
-}
-
-function _filter(eachfn, coll, iteratee, callback) {
-    var filter = isArrayLike(coll) ? filterArray : filterGeneric;
-    filter(eachfn, coll, wrapAsync(iteratee), callback || noop);
-}
-
-/**
- * Returns a new array of all the values in `coll` which pass an async truth
- * test. This operation is performed in parallel, but the results array will be
- * in the same order as the original.
- *
- * @name filter
- * @static
- * @memberOf module:Collections
- * @method
- * @alias select
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {Function} iteratee - A truth test to apply to each item in `coll`.
- * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
- * with a boolean argument once it has completed. Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Invoked with (err, results).
- * @example
- *
- * async.filter(['file1','file2','file3'], function(filePath, callback) {
- *     fs.access(filePath, function(err) {
- *         callback(null, !err)
- *     });
- * }, function(err, results) {
- *     // results now equals an array of the existing files
- * });
- */
-var filter = doParallel(_filter);
-
-/**
- * The same as [`filter`]{@link module:Collections.filter} but runs a maximum of `limit` async operations at a
- * time.
- *
- * @name filterLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.filter]{@link module:Collections.filter}
- * @alias selectLimit
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {Function} iteratee - A truth test to apply to each item in `coll`.
- * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
- * with a boolean argument once it has completed. Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Invoked with (err, results).
- */
-var filterLimit = doParallelLimit(_filter);
-
-/**
- * The same as [`filter`]{@link module:Collections.filter} but runs only a single async operation at a time.
- *
- * @name filterSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.filter]{@link module:Collections.filter}
- * @alias selectSeries
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {Function} iteratee - A truth test to apply to each item in `coll`.
- * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
- * with a boolean argument once it has completed. Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Invoked with (err, results)
- */
-var filterSeries = doLimit(filterLimit, 1);
-
-/**
- * Calls the asynchronous function `fn` with a callback parameter that allows it
- * to call itself again, in series, indefinitely.
-
- * If an error is passed to the callback then `errback` is called with the
- * error, and execution stops, otherwise it will never be called.
- *
- * @name forever
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {AsyncFunction} fn - an async function to call repeatedly.
- * Invoked with (next).
- * @param {Function} [errback] - when `fn` passes an error to it's callback,
- * this function will be called, and execution stops. Invoked with (err).
- * @example
- *
- * async.forever(
- *     function(next) {
- *         // next is suitable for passing to things that need a callback(err [, whatever]);
- *         // it will result in this function being called again.
- *     },
- *     function(err) {
- *         // if next is called with a value in its first parameter, it will appear
- *         // in here as 'err', and execution will stop.
- *     }
- * );
- */
-function forever(fn, errback) {
-    var done = onlyOnce(errback || noop);
-    var task = wrapAsync(ensureAsync(fn));
-
-    function next(err) {
-        if (err) return done(err);
-        task(next);
+        return next();
     }
-    next();
-}
-
-/**
- * The same as [`groupBy`]{@link module:Collections.groupBy} but runs a maximum of `limit` async operations at a time.
- *
- * @name groupByLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.groupBy]{@link module:Collections.groupBy}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The iteratee should complete with a `key` to group the value under.
- * Invoked with (value, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Result is an `Object` whoses
- * properties are arrays of values which returned the corresponding key.
- */
-var groupByLimit = function(coll, limit, iteratee, callback) {
-    callback = callback || noop;
-    var _iteratee = wrapAsync(iteratee);
-    mapLimit(coll, limit, function(val, callback) {
-        _iteratee(val, function(err, key) {
-            if (err) return callback(err);
-            return callback(null, {key: key, val: val});
-        });
-    }, function(err, mapResults) {
-        var result = {};
-        // from MDN, handle object having an `hasOwnProperty` prop
-        var hasOwnProperty = Object.prototype.hasOwnProperty;
-
-        for (var i = 0; i < mapResults.length; i++) {
-            if (mapResults[i]) {
-                var key = mapResults[i].key;
-                var val = mapResults[i].val;
-
-                if (hasOwnProperty.call(result, key)) {
-                    result[key].push(val);
-                } else {
-                    result[key] = [val];
+    var forever$1 = awaitify(forever, 2);
+
+    /**
+     * The same as [`groupBy`]{@link module:Collections.groupBy} but runs a maximum of `limit` async operations at a time.
+     *
+     * @name groupByLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.groupBy]{@link module:Collections.groupBy}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The iteratee should complete with a `key` to group the value under.
+     * Invoked with (value, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Result is an `Object` whoses
+     * properties are arrays of values which returned the corresponding key.
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function groupByLimit(coll, limit, iteratee, callback) {
+        var _iteratee = wrapAsync(iteratee);
+        return mapLimit$1(coll, limit, (val, iterCb) => {
+            _iteratee(val, (err, key) => {
+                if (err) return iterCb(err);
+                return iterCb(null, {key, val});
+            });
+        }, (err, mapResults) => {
+            var result = {};
+            // from MDN, handle object having an `hasOwnProperty` prop
+            var {hasOwnProperty} = Object.prototype;
+
+            for (var i = 0; i < mapResults.length; i++) {
+                if (mapResults[i]) {
+                    var {key} = mapResults[i];
+                    var {val} = mapResults[i];
+
+                    if (hasOwnProperty.call(result, key)) {
+                        result[key].push(val);
+                    } else {
+                        result[key] = [val];
+                    }
                 }
             }
-        }
 
-        return callback(err, result);
-    });
-};
-
-/**
- * Returns a new object, where each value corresponds to an array of items, from
- * `coll`, that returned the corresponding key. That is, the keys of the object
- * correspond to the values passed to the `iteratee` callback.
- *
- * Note: Since this function applies the `iteratee` to each item in parallel,
- * there is no guarantee that the `iteratee` functions will complete in order.
- * However, the values for each key in the `result` will be in the same order as
- * the original `coll`. For Objects, the values will roughly be in the order of
- * the original Objects' keys (but this can vary across JavaScript engines).
- *
- * @name groupBy
- * @static
- * @memberOf module:Collections
- * @method
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The iteratee should complete with a `key` to group the value under.
- * Invoked with (value, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Result is an `Object` whoses
- * properties are arrays of values which returned the corresponding key.
- * @example
- *
- * async.groupBy(['userId1', 'userId2', 'userId3'], function(userId, callback) {
- *     db.findById(userId, function(err, user) {
- *         if (err) return callback(err);
- *         return callback(null, user.age);
- *     });
- * }, function(err, result) {
- *     // result is object containing the userIds grouped by age
- *     // e.g. { 30: ['userId1', 'userId3'], 42: ['userId2']};
- * });
- */
-var groupBy = doLimit(groupByLimit, Infinity);
-
-/**
- * The same as [`groupBy`]{@link module:Collections.groupBy} but runs only a single async operation at a time.
- *
- * @name groupBySeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.groupBy]{@link module:Collections.groupBy}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The iteratee should complete with a `key` to group the value under.
- * Invoked with (value, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. Result is an `Object` whoses
- * properties are arrays of values which returned the corresponding key.
- */
-var groupBySeries = doLimit(groupByLimit, 1);
-
-/**
- * Logs the result of an `async` function to the `console`. Only works in
- * Node.js or in browsers that support `console.log` and `console.error` (such
- * as FF and Chrome). If multiple arguments are returned from the async
- * function, `console.log` is called on each argument in order.
- *
- * @name log
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {AsyncFunction} function - The function you want to eventually apply
- * all arguments to.
- * @param {...*} arguments... - Any number of arguments to apply to the function.
- * @example
- *
- * // in a module
- * var hello = function(name, callback) {
- *     setTimeout(function() {
- *         callback(null, 'hello ' + name);
- *     }, 1000);
- * };
- *
- * // in the node repl
- * node> async.log(hello, 'world');
- * 'hello world'
- */
-var log = consoleFunc('log');
-
-/**
- * The same as [`mapValues`]{@link module:Collections.mapValues} but runs a maximum of `limit` async operations at a
- * time.
- *
- * @name mapValuesLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.mapValues]{@link module:Collections.mapValues}
- * @category Collection
- * @param {Object} obj - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - A function to apply to each value and key
- * in `coll`.
- * The iteratee should complete with the transformed value as its result.
- * Invoked with (value, key, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. `result` is a new object consisting
- * of each key from `obj`, with each transformed value on the right-hand side.
- * Invoked with (err, result).
- */
-function mapValuesLimit(obj, limit, iteratee, callback) {
-    callback = once(callback || noop);
-    var newObj = {};
-    var _iteratee = wrapAsync(iteratee);
-    eachOfLimit(obj, limit, function(val, key, next) {
-        _iteratee(val, key, function (err, result) {
-            if (err) return next(err);
-            newObj[key] = result;
-            next();
+            return callback(err, result);
         });
-    }, function (err) {
-        callback(err, newObj);
-    });
-}
-
-/**
- * A relative of [`map`]{@link module:Collections.map}, designed for use with objects.
- *
- * Produces a new Object by mapping each value of `obj` through the `iteratee`
- * function. The `iteratee` is called each `value` and `key` from `obj` and a
- * callback for when it has finished processing. Each of these callbacks takes
- * two arguments: an `error`, and the transformed item from `obj`. If `iteratee`
- * passes an error to its callback, the main `callback` (for the `mapValues`
- * function) is immediately called with the error.
- *
- * Note, the order of the keys in the result is not guaranteed.  The keys will
- * be roughly in the order they complete, (but this is very engine-specific)
- *
- * @name mapValues
- * @static
- * @memberOf module:Collections
- * @method
- * @category Collection
- * @param {Object} obj - A collection to iterate over.
- * @param {AsyncFunction} iteratee - A function to apply to each value and key
- * in `coll`.
- * The iteratee should complete with the transformed value as its result.
- * Invoked with (value, key, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. `result` is a new object consisting
- * of each key from `obj`, with each transformed value on the right-hand side.
- * Invoked with (err, result).
- * @example
- *
- * async.mapValues({
- *     f1: 'file1',
- *     f2: 'file2',
- *     f3: 'file3'
- * }, function (file, key, callback) {
- *   fs.stat(file, callback);
- * }, function(err, result) {
- *     // result is now a map of stats for each file, e.g.
- *     // {
- *     //     f1: [stats for file1],
- *     //     f2: [stats for file2],
- *     //     f3: [stats for file3]
- *     // }
- * });
- */
-
-var mapValues = doLimit(mapValuesLimit, Infinity);
-
-/**
- * The same as [`mapValues`]{@link module:Collections.mapValues} but runs only a single async operation at a time.
- *
- * @name mapValuesSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.mapValues]{@link module:Collections.mapValues}
- * @category Collection
- * @param {Object} obj - A collection to iterate over.
- * @param {AsyncFunction} iteratee - A function to apply to each value and key
- * in `coll`.
- * The iteratee should complete with the transformed value as its result.
- * Invoked with (value, key, callback).
- * @param {Function} [callback] - A callback which is called when all `iteratee`
- * functions have finished, or an error occurs. `result` is a new object consisting
- * of each key from `obj`, with each transformed value on the right-hand side.
- * Invoked with (err, result).
- */
-var mapValuesSeries = doLimit(mapValuesLimit, 1);
-
-function has(obj, key) {
-    return key in obj;
-}
-
-/**
- * Caches the results of an async function. When creating a hash to store
- * function results against, the callback is omitted from the hash and an
- * optional hash function can be used.
- *
- * If no hash function is specified, the first argument is used as a hash key,
- * which may work reasonably if it is a string or a data type that converts to a
- * distinct string. Note that objects and arrays will not behave reasonably.
- * Neither will cases where the other arguments are significant. In such cases,
- * specify your own hash function.
- *
- * The cache of results is exposed as the `memo` property of the function
- * returned by `memoize`.
- *
- * @name memoize
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {AsyncFunction} fn - The async function to proxy and cache results from.
- * @param {Function} hasher - An optional function for generating a custom hash
- * for storing results. It has all the arguments applied to it apart from the
- * callback, and must be synchronous.
- * @returns {AsyncFunction} a memoized version of `fn`
- * @example
- *
- * var slow_fn = function(name, callback) {
- *     // do something
- *     callback(null, result);
- * };
- * var fn = async.memoize(slow_fn);
- *
- * // fn can now be used as if it were slow_fn
- * fn('some name', function() {
- *     // callback
- * });
- */
-function memoize(fn, hasher) {
-    var memo = Object.create(null);
-    var queues = Object.create(null);
-    hasher = hasher || identity;
-    var _fn = wrapAsync(fn);
-    var memoized = initialParams(function memoized(args, callback) {
-        var key = hasher.apply(null, args);
-        if (has(memo, key)) {
-            setImmediate$1(function() {
-                callback.apply(null, memo[key]);
+    }
+
+    var groupByLimit$1 = awaitify(groupByLimit, 4);
+
+    /**
+     * Returns a new object, where each value corresponds to an array of items, from
+     * `coll`, that returned the corresponding key. That is, the keys of the object
+     * correspond to the values passed to the `iteratee` callback.
+     *
+     * Note: Since this function applies the `iteratee` to each item in parallel,
+     * there is no guarantee that the `iteratee` functions will complete in order.
+     * However, the values for each key in the `result` will be in the same order as
+     * the original `coll`. For Objects, the values will roughly be in the order of
+     * the original Objects' keys (but this can vary across JavaScript engines).
+     *
+     * @name groupBy
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The iteratee should complete with a `key` to group the value under.
+     * Invoked with (value, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Result is an `Object` whoses
+     * properties are arrays of values which returned the corresponding key.
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     *
+     * async.groupBy(['userId1', 'userId2', 'userId3'], function(userId, callback) {
+     *     db.findById(userId, function(err, user) {
+     *         if (err) return callback(err);
+     *         return callback(null, user.age);
+     *     });
+     * }, function(err, result) {
+     *     // result is object containing the userIds grouped by age
+     *     // e.g. { 30: ['userId1', 'userId3'], 42: ['userId2']};
+     * });
+     */
+    function groupBy (coll, iteratee, callback) {
+        return groupByLimit$1(coll, Infinity, iteratee, callback)
+    }
+
+    /**
+     * The same as [`groupBy`]{@link module:Collections.groupBy} but runs only a single async operation at a time.
+     *
+     * @name groupBySeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.groupBy]{@link module:Collections.groupBy}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The iteratee should complete with a `key` to group the value under.
+     * Invoked with (value, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. Result is an `Object` whoses
+     * properties are arrays of values which returned the corresponding key.
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function groupBySeries (coll, iteratee, callback) {
+        return groupByLimit$1(coll, 1, iteratee, callback)
+    }
+
+    /**
+     * Logs the result of an `async` function to the `console`. Only works in
+     * Node.js or in browsers that support `console.log` and `console.error` (such
+     * as FF and Chrome). If multiple arguments are returned from the async
+     * function, `console.log` is called on each argument in order.
+     *
+     * @name log
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {AsyncFunction} function - The function you want to eventually apply
+     * all arguments to.
+     * @param {...*} arguments... - Any number of arguments to apply to the function.
+     * @example
+     *
+     * // in a module
+     * var hello = function(name, callback) {
+     *     setTimeout(function() {
+     *         callback(null, 'hello ' + name);
+     *     }, 1000);
+     * };
+     *
+     * // in the node repl
+     * node> async.log(hello, 'world');
+     * 'hello world'
+     */
+    var log = consoleFunc('log');
+
+    /**
+     * The same as [`mapValues`]{@link module:Collections.mapValues} but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name mapValuesLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.mapValues]{@link module:Collections.mapValues}
+     * @category Collection
+     * @param {Object} obj - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - A function to apply to each value and key
+     * in `coll`.
+     * The iteratee should complete with the transformed value as its result.
+     * Invoked with (value, key, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. `result` is a new object consisting
+     * of each key from `obj`, with each transformed value on the right-hand side.
+     * Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function mapValuesLimit(obj, limit, iteratee, callback) {
+        callback = once(callback);
+        var newObj = {};
+        var _iteratee = wrapAsync(iteratee);
+        return eachOfLimit(limit)(obj, (val, key, next) => {
+            _iteratee(val, key, (err, result) => {
+                if (err) return next(err);
+                newObj[key] = result;
+                next();
             });
-        } else if (has(queues, key)) {
-            queues[key].push(callback);
-        } else {
-            queues[key] = [callback];
-            _fn.apply(null, args.concat(function(/*args*/) {
-                var args = slice(arguments);
-                memo[key] = args;
-                var q = queues[key];
-                delete queues[key];
-                for (var i = 0, l = q.length; i < l; i++) {
-                    q[i].apply(null, args);
-                }
-            }));
-        }
-    });
-    memoized.memo = memo;
-    memoized.unmemoized = fn;
-    return memoized;
-}
-
-/**
- * Calls `callback` on a later loop around the event loop. In Node.js this just
- * calls `process.nextTick`.  In the browser it will use `setImmediate` if
- * available, otherwise `setTimeout(callback, 0)`, which means other higher
- * priority events may precede the execution of `callback`.
- *
- * This is used internally for browser-compatibility purposes.
- *
- * @name nextTick
- * @static
- * @memberOf module:Utils
- * @method
- * @see [async.setImmediate]{@link module:Utils.setImmediate}
- * @category Util
- * @param {Function} callback - The function to call on a later loop around
- * the event loop. Invoked with (args...).
- * @param {...*} args... - any number of additional arguments to pass to the
- * callback on the next tick.
- * @example
- *
- * var call_order = [];
- * async.nextTick(function() {
- *     call_order.push('two');
- *     // call_order now equals ['one','two']
- * });
- * call_order.push('one');
- *
- * async.setImmediate(function (a, b, c) {
- *     // a, b, and c equal 1, 2, and 3
- * }, 1, 2, 3);
- */
-var _defer$1;
-
-if (hasNextTick) {
-    _defer$1 = process.nextTick;
-} else if (hasSetImmediate) {
-    _defer$1 = setImmediate;
-} else {
-    _defer$1 = fallback;
-}
-
-var nextTick = wrap(_defer$1);
-
-function _parallel(eachfn, tasks, callback) {
-    callback = callback || noop;
-    var results = isArrayLike(tasks) ? [] : {};
-
-    eachfn(tasks, function (task, key, callback) {
-        wrapAsync(task)(function (err, result) {
-            if (arguments.length > 2) {
-                result = slice(arguments, 1);
+        }, err => callback(err, newObj));
+    }
+
+    var mapValuesLimit$1 = awaitify(mapValuesLimit, 4);
+
+    /**
+     * A relative of [`map`]{@link module:Collections.map}, designed for use with objects.
+     *
+     * Produces a new Object by mapping each value of `obj` through the `iteratee`
+     * function. The `iteratee` is called each `value` and `key` from `obj` and a
+     * callback for when it has finished processing. Each of these callbacks takes
+     * two arguments: an `error`, and the transformed item from `obj`. If `iteratee`
+     * passes an error to its callback, the main `callback` (for the `mapValues`
+     * function) is immediately called with the error.
+     *
+     * Note, the order of the keys in the result is not guaranteed.  The keys will
+     * be roughly in the order they complete, (but this is very engine-specific)
+     *
+     * @name mapValues
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @category Collection
+     * @param {Object} obj - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - A function to apply to each value and key
+     * in `coll`.
+     * The iteratee should complete with the transformed value as its result.
+     * Invoked with (value, key, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. `result` is a new object consisting
+     * of each key from `obj`, with each transformed value on the right-hand side.
+     * Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     *
+     * async.mapValues({
+     *     f1: 'file1',
+     *     f2: 'file2',
+     *     f3: 'file3'
+     * }, function (file, key, callback) {
+     *   fs.stat(file, callback);
+     * }, function(err, result) {
+     *     // result is now a map of stats for each file, e.g.
+     *     // {
+     *     //     f1: [stats for file1],
+     *     //     f2: [stats for file2],
+     *     //     f3: [stats for file3]
+     *     // }
+     * });
+     */
+    function mapValues(obj, iteratee, callback) {
+        return mapValuesLimit$1(obj, Infinity, iteratee, callback)
+    }
+
+    /**
+     * The same as [`mapValues`]{@link module:Collections.mapValues} but runs only a single async operation at a time.
+     *
+     * @name mapValuesSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.mapValues]{@link module:Collections.mapValues}
+     * @category Collection
+     * @param {Object} obj - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - A function to apply to each value and key
+     * in `coll`.
+     * The iteratee should complete with the transformed value as its result.
+     * Invoked with (value, key, callback).
+     * @param {Function} [callback] - A callback which is called when all `iteratee`
+     * functions have finished, or an error occurs. `result` is a new object consisting
+     * of each key from `obj`, with each transformed value on the right-hand side.
+     * Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function mapValuesSeries(obj, iteratee, callback) {
+        return mapValuesLimit$1(obj, 1, iteratee, callback)
+    }
+
+    /**
+     * Caches the results of an async function. When creating a hash to store
+     * function results against, the callback is omitted from the hash and an
+     * optional hash function can be used.
+     *
+     * **Note: if the async function errs, the result will not be cached and
+     * subsequent calls will call the wrapped function.**
+     *
+     * If no hash function is specified, the first argument is used as a hash key,
+     * which may work reasonably if it is a string or a data type that converts to a
+     * distinct string. Note that objects and arrays will not behave reasonably.
+     * Neither will cases where the other arguments are significant. In such cases,
+     * specify your own hash function.
+     *
+     * The cache of results is exposed as the `memo` property of the function
+     * returned by `memoize`.
+     *
+     * @name memoize
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {AsyncFunction} fn - The async function to proxy and cache results from.
+     * @param {Function} hasher - An optional function for generating a custom hash
+     * for storing results. It has all the arguments applied to it apart from the
+     * callback, and must be synchronous.
+     * @returns {AsyncFunction} a memoized version of `fn`
+     * @example
+     *
+     * var slow_fn = function(name, callback) {
+     *     // do something
+     *     callback(null, result);
+     * };
+     * var fn = async.memoize(slow_fn);
+     *
+     * // fn can now be used as if it were slow_fn
+     * fn('some name', function() {
+     *     // callback
+     * });
+     */
+    function memoize(fn, hasher = v => v) {
+        var memo = Object.create(null);
+        var queues = Object.create(null);
+        var _fn = wrapAsync(fn);
+        var memoized = initialParams((args, callback) => {
+            var key = hasher(...args);
+            if (key in memo) {
+                setImmediate$1(() => callback(null, ...memo[key]));
+            } else if (key in queues) {
+                queues[key].push(callback);
+            } else {
+                queues[key] = [callback];
+                _fn(...args, (err, ...resultArgs) => {
+                    // #1465 don't memoize if an error occurred
+                    if (!err) {
+                        memo[key] = resultArgs;
+                    }
+                    var q = queues[key];
+                    delete queues[key];
+                    for (var i = 0, l = q.length; i < l; i++) {
+                        q[i](err, ...resultArgs);
+                    }
+                });
             }
-            results[key] = result;
-            callback(err);
         });
-    }, function (err) {
-        callback(err, results);
-    });
-}
-
-/**
- * Run the `tasks` collection of functions in parallel, without waiting until
- * the previous function has completed. If any of the functions pass an error to
- * its callback, the main `callback` is immediately called with the value of the
- * error. Once the `tasks` have completed, the results are passed to the final
- * `callback` as an array.
- *
- * **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about
- * parallel execution of code.  If your tasks do not use any timers or perform
- * any I/O, they will actually be executed in series.  Any synchronous setup
- * sections for each task will happen one after the other.  JavaScript remains
- * single-threaded.
- *
- * **Hint:** Use [`reflect`]{@link module:Utils.reflect} to continue the
- * execution of other tasks when a task fails.
- *
- * It is also possible to use an object instead of an array. Each property will
- * be run as a function and the results will be passed to the final `callback`
- * as an object instead of an array. This can be a more readable way of handling
- * results from {@link async.parallel}.
- *
- * @name parallel
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Array|Iterable|Object} tasks - A collection of
- * [async functions]{@link AsyncFunction} to run.
- * Each async function can complete with any number of optional `result` values.
- * @param {Function} [callback] - An optional callback to run once all the
- * functions have completed successfully. This function gets a results array
- * (or object) containing all the result arguments passed to the task callbacks.
- * Invoked with (err, results).
- *
- * @example
- * async.parallel([
- *     function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'one');
- *         }, 200);
- *     },
- *     function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'two');
- *         }, 100);
- *     }
- * ],
- * // optional callback
- * function(err, results) {
- *     // the results array will equal ['one','two'] even though
- *     // the second function had a shorter timeout.
- * });
- *
- * // an example using an object instead of an array
- * async.parallel({
- *     one: function(callback) {
- *         setTimeout(function() {
- *             callback(null, 1);
- *         }, 200);
- *     },
- *     two: function(callback) {
- *         setTimeout(function() {
- *             callback(null, 2);
- *         }, 100);
- *     }
- * }, function(err, results) {
- *     // results is now equals to: {one: 1, two: 2}
- * });
- */
-function parallelLimit(tasks, callback) {
-    _parallel(eachOf, tasks, callback);
-}
-
-/**
- * The same as [`parallel`]{@link module:ControlFlow.parallel} but runs a maximum of `limit` async operations at a
- * time.
- *
- * @name parallelLimit
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.parallel]{@link module:ControlFlow.parallel}
- * @category Control Flow
- * @param {Array|Iterable|Object} tasks - A collection of
- * [async functions]{@link AsyncFunction} to run.
- * Each async function can complete with any number of optional `result` values.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {Function} [callback] - An optional callback to run once all the
- * functions have completed successfully. This function gets a results array
- * (or object) containing all the result arguments passed to the task callbacks.
- * Invoked with (err, results).
- */
-function parallelLimit$1(tasks, limit, callback) {
-    _parallel(_eachOfLimit(limit), tasks, callback);
-}
-
-/**
- * A queue of tasks for the worker function to complete.
- * @typedef {Object} QueueObject
- * @memberOf module:ControlFlow
- * @property {Function} length - a function returning the number of items
- * waiting to be processed. Invoke with `queue.length()`.
- * @property {boolean} started - a boolean indicating whether or not any
- * items have been pushed and processed by the queue.
- * @property {Function} running - a function returning the number of items
- * currently being processed. Invoke with `queue.running()`.
- * @property {Function} workersList - a function returning the array of items
- * currently being processed. Invoke with `queue.workersList()`.
- * @property {Function} idle - a function returning false if there are items
- * waiting or being processed, or true if not. Invoke with `queue.idle()`.
- * @property {number} concurrency - an integer for determining how many `worker`
- * functions should be run in parallel. This property can be changed after a
- * `queue` is created to alter the concurrency on-the-fly.
- * @property {Function} push - add a new task to the `queue`. Calls `callback`
- * once the `worker` has finished processing the task. Instead of a single task,
- * a `tasks` array can be submitted. The respective callback is used for every
- * task in the list. Invoke with `queue.push(task, [callback])`,
- * @property {Function} unshift - add a new task to the front of the `queue`.
- * Invoke with `queue.unshift(task, [callback])`.
- * @property {Function} remove - remove items from the queue that match a test
- * function.  The test function will be passed an object with a `data` property,
- * and a `priority` property, if this is a
- * [priorityQueue]{@link module:ControlFlow.priorityQueue} object.
- * Invoked with `queue.remove(testFn)`, where `testFn` is of the form
- * `function ({data, priority}) {}` and returns a Boolean.
- * @property {Function} saturated - a callback that is called when the number of
- * running workers hits the `concurrency` limit, and further tasks will be
- * queued.
- * @property {Function} unsaturated - a callback that is called when the number
- * of running workers is less than the `concurrency` & `buffer` limits, and
- * further tasks will not be queued.
- * @property {number} buffer - A minimum threshold buffer in order to say that
- * the `queue` is `unsaturated`.
- * @property {Function} empty - a callback that is called when the last item
- * from the `queue` is given to a `worker`.
- * @property {Function} drain - a callback that is called when the last item
- * from the `queue` has returned from the `worker`.
- * @property {Function} error - a callback that is called when a task errors.
- * Has the signature `function(error, task)`.
- * @property {boolean} paused - a boolean for determining whether the queue is
- * in a paused state.
- * @property {Function} pause - a function that pauses the processing of tasks
- * until `resume()` is called. Invoke with `queue.pause()`.
- * @property {Function} resume - a function that resumes the processing of
- * queued tasks when the queue is paused. Invoke with `queue.resume()`.
- * @property {Function} kill - a function that removes the `drain` callback and
- * empties remaining tasks from the queue forcing it to go idle. No more tasks
- * should be pushed to the queue after calling this function. Invoke with `queue.kill()`.
- */
-
-/**
- * Creates a `queue` object with the specified `concurrency`. Tasks added to the
- * `queue` are processed in parallel (up to the `concurrency` limit). If all
- * `worker`s are in progress, the task is queued until one becomes available.
- * Once a `worker` completes a `task`, that `task`'s callback is called.
- *
- * @name queue
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {AsyncFunction} worker - An async function for processing a queued task.
- * If you want to handle errors from an individual task, pass a callback to
- * `q.push()`. Invoked with (task, callback).
- * @param {number} [concurrency=1] - An `integer` for determining how many
- * `worker` functions should be run in parallel.  If omitted, the concurrency
- * defaults to `1`.  If the concurrency is `0`, an error is thrown.
- * @returns {module:ControlFlow.QueueObject} A queue object to manage the tasks. Callbacks can
- * attached as certain properties to listen for specific events during the
- * lifecycle of the queue.
- * @example
- *
- * // create a queue object with concurrency 2
- * var q = async.queue(function(task, callback) {
- *     console.log('hello ' + task.name);
- *     callback();
- * }, 2);
- *
- * // assign a callback
- * q.drain = function() {
- *     console.log('all items have been processed');
- * };
- *
- * // add some items to the queue
- * q.push({name: 'foo'}, function(err) {
- *     console.log('finished processing foo');
- * });
- * q.push({name: 'bar'}, function (err) {
- *     console.log('finished processing bar');
- * });
- *
- * // add some items to the queue (batch-wise)
- * q.push([{name: 'baz'},{name: 'bay'},{name: 'bax'}], function(err) {
- *     console.log('finished processing item');
- * });
- *
- * // add some items to the front of the queue
- * q.unshift({name: 'bar'}, function (err) {
- *     console.log('finished processing bar');
- * });
- */
-var queue$1 = function (worker, concurrency) {
-    var _worker = wrapAsync(worker);
-    return queue(function (items, cb) {
-        _worker(items[0], cb);
-    }, concurrency, 1);
-};
-
-/**
- * The same as [async.queue]{@link module:ControlFlow.queue} only tasks are assigned a priority and
- * completed in ascending priority order.
- *
- * @name priorityQueue
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.queue]{@link module:ControlFlow.queue}
- * @category Control Flow
- * @param {AsyncFunction} worker - An async function for processing a queued task.
- * If you want to handle errors from an individual task, pass a callback to
- * `q.push()`.
- * Invoked with (task, callback).
- * @param {number} concurrency - An `integer` for determining how many `worker`
- * functions should be run in parallel.  If omitted, the concurrency defaults to
- * `1`.  If the concurrency is `0`, an error is thrown.
- * @returns {module:ControlFlow.QueueObject} A priorityQueue object to manage the tasks. There are two
- * differences between `queue` and `priorityQueue` objects:
- * * `push(task, priority, [callback])` - `priority` should be a number. If an
- *   array of `tasks` is given, all tasks will be assigned the same priority.
- * * The `unshift` method was removed.
- */
-var priorityQueue = function(worker, concurrency) {
-    // Start with a normal queue
-    var q = queue$1(worker, concurrency);
-
-    // Override push to accept second parameter representing priority
-    q.push = function(data, priority, callback) {
-        if (callback == null) callback = noop;
-        if (typeof callback !== 'function') {
-            throw new Error('task callback must be a function');
-        }
-        q.started = true;
-        if (!isArray(data)) {
-            data = [data];
-        }
-        if (data.length === 0) {
-            // call drain immediately if there are no tasks
-            return setImmediate$1(function() {
-                q.drain();
+        memoized.memo = memo;
+        memoized.unmemoized = fn;
+        return memoized;
+    }
+
+    /**
+     * Calls `callback` on a later loop around the event loop. In Node.js this just
+     * calls `process.nextTick`.  In the browser it will use `setImmediate` if
+     * available, otherwise `setTimeout(callback, 0)`, which means other higher
+     * priority events may precede the execution of `callback`.
+     *
+     * This is used internally for browser-compatibility purposes.
+     *
+     * @name nextTick
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @see [async.setImmediate]{@link module:Utils.setImmediate}
+     * @category Util
+     * @param {Function} callback - The function to call on a later loop around
+     * the event loop. Invoked with (args...).
+     * @param {...*} args... - any number of additional arguments to pass to the
+     * callback on the next tick.
+     * @example
+     *
+     * var call_order = [];
+     * async.nextTick(function() {
+     *     call_order.push('two');
+     *     // call_order now equals ['one','two']
+     * });
+     * call_order.push('one');
+     *
+     * async.setImmediate(function (a, b, c) {
+     *     // a, b, and c equal 1, 2, and 3
+     * }, 1, 2, 3);
+     */
+    var _defer$1;
+
+    if (hasNextTick) {
+        _defer$1 = process.nextTick;
+    } else if (hasSetImmediate) {
+        _defer$1 = setImmediate;
+    } else {
+        _defer$1 = fallback;
+    }
+
+    var nextTick = wrap(_defer$1);
+
+    var _parallel = awaitify((eachfn, tasks, callback) => {
+        var results = isArrayLike(tasks) ? [] : {};
+
+        eachfn(tasks, (task, key, taskCb) => {
+            wrapAsync(task)((err, ...result) => {
+                if (result.length < 2) {
+                    [result] = result;
+                }
+                results[key] = result;
+                taskCb(err);
             });
-        }
+        }, err => callback(err, results));
+    }, 3);
+
+    /**
+     * Run the `tasks` collection of functions in parallel, without waiting until
+     * the previous function has completed. If any of the functions pass an error to
+     * its callback, the main `callback` is immediately called with the value of the
+     * error. Once the `tasks` have completed, the results are passed to the final
+     * `callback` as an array.
+     *
+     * **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about
+     * parallel execution of code.  If your tasks do not use any timers or perform
+     * any I/O, they will actually be executed in series.  Any synchronous setup
+     * sections for each task will happen one after the other.  JavaScript remains
+     * single-threaded.
+     *
+     * **Hint:** Use [`reflect`]{@link module:Utils.reflect} to continue the
+     * execution of other tasks when a task fails.
+     *
+     * It is also possible to use an object instead of an array. Each property will
+     * be run as a function and the results will be passed to the final `callback`
+     * as an object instead of an array. This can be a more readable way of handling
+     * results from {@link async.parallel}.
+     *
+     * @name parallel
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {Array|Iterable|AsyncIterable|Object} tasks - A collection of
+     * [async functions]{@link AsyncFunction} to run.
+     * Each async function can complete with any number of optional `result` values.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed successfully. This function gets a results array
+     * (or object) containing all the result arguments passed to the task callbacks.
+     * Invoked with (err, results).
+     * @returns {Promise} a promise, if a callback is not passed
+     *
+     * @example
+     * async.parallel([
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'one');
+     *         }, 200);
+     *     },
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'two');
+     *         }, 100);
+     *     }
+     * ],
+     * // optional callback
+     * function(err, results) {
+     *     // the results array will equal ['one','two'] even though
+     *     // the second function had a shorter timeout.
+     * });
+     *
+     * // an example using an object instead of an array
+     * async.parallel({
+     *     one: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 1);
+     *         }, 200);
+     *     },
+     *     two: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 2);
+     *         }, 100);
+     *     }
+     * }, function(err, results) {
+     *     // results is now equals to: {one: 1, two: 2}
+     * });
+     */
+    function parallel(tasks, callback) {
+        return _parallel(eachOf$1, tasks, callback);
+    }
 
-        priority = priority || 0;
-        var nextNode = q._tasks.head;
-        while (nextNode && priority >= nextNode.priority) {
-            nextNode = nextNode.next;
-        }
+    /**
+     * The same as [`parallel`]{@link module:ControlFlow.parallel} but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name parallelLimit
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.parallel]{@link module:ControlFlow.parallel}
+     * @category Control Flow
+     * @param {Array|Iterable|AsyncIterable|Object} tasks - A collection of
+     * [async functions]{@link AsyncFunction} to run.
+     * Each async function can complete with any number of optional `result` values.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed successfully. This function gets a results array
+     * (or object) containing all the result arguments passed to the task callbacks.
+     * Invoked with (err, results).
+     * @returns {Promise} a promise, if a callback is not passed
+     */
+    function parallelLimit(tasks, limit, callback) {
+        return _parallel(eachOfLimit(limit), tasks, callback);
+    }
 
-        for (var i = 0, l = data.length; i < l; i++) {
-            var item = {
-                data: data[i],
-                priority: priority,
-                callback: callback
-            };
+    /**
+     * A queue of tasks for the worker function to complete.
+     * @typedef {Iterable} QueueObject
+     * @memberOf module:ControlFlow
+     * @property {Function} length - a function returning the number of items
+     * waiting to be processed. Invoke with `queue.length()`.
+     * @property {boolean} started - a boolean indicating whether or not any
+     * items have been pushed and processed by the queue.
+     * @property {Function} running - a function returning the number of items
+     * currently being processed. Invoke with `queue.running()`.
+     * @property {Function} workersList - a function returning the array of items
+     * currently being processed. Invoke with `queue.workersList()`.
+     * @property {Function} idle - a function returning false if there are items
+     * waiting or being processed, or true if not. Invoke with `queue.idle()`.
+     * @property {number} concurrency - an integer for determining how many `worker`
+     * functions should be run in parallel. This property can be changed after a
+     * `queue` is created to alter the concurrency on-the-fly.
+     * @property {Function} push - add a new task to the `queue`. Calls `callback`
+     * once the `worker` has finished processing the task. Instead of a single task,
+     * a `tasks` array can be submitted. The respective callback is used for every
+     * task in the list. Invoke with `queue.push(task, [callback])`,
+     * @property {Function} unshift - add a new task to the front of the `queue`.
+     * Invoke with `queue.unshift(task, [callback])`.
+     * @property {Function} remove - remove items from the queue that match a test
+     * function.  The test function will be passed an object with a `data` property,
+     * and a `priority` property, if this is a
+     * [priorityQueue]{@link module:ControlFlow.priorityQueue} object.
+     * Invoked with `queue.remove(testFn)`, where `testFn` is of the form
+     * `function ({data, priority}) {}` and returns a Boolean.
+     * @property {Function} saturated - a callback that is called when the number of
+     * running workers hits the `concurrency` limit, and further tasks will be
+     * queued.
+     * @property {Function} unsaturated - a callback that is called when the number
+     * of running workers is less than the `concurrency` & `buffer` limits, and
+     * further tasks will not be queued.
+     * @property {number} buffer - A minimum threshold buffer in order to say that
+     * the `queue` is `unsaturated`.
+     * @property {Function} empty - a callback that is called when the last item
+     * from the `queue` is given to a `worker`.
+     * @property {Function} drain - a callback that is called when the last item
+     * from the `queue` has returned from the `worker`.
+     * @property {Function} error - a callback that is called when a task errors.
+     * Has the signature `function(error, task)`.
+     * @property {boolean} paused - a boolean for determining whether the queue is
+     * in a paused state.
+     * @property {Function} pause - a function that pauses the processing of tasks
+     * until `resume()` is called. Invoke with `queue.pause()`.
+     * @property {Function} resume - a function that resumes the processing of
+     * queued tasks when the queue is paused. Invoke with `queue.resume()`.
+     * @property {Function} kill - a function that removes the `drain` callback and
+     * empties remaining tasks from the queue forcing it to go idle. No more tasks
+     * should be pushed to the queue after calling this function. Invoke with `queue.kill()`.
+     *
+     * @example
+     * const q = aync.queue(worker, 2)
+     * q.push(item1)
+     * q.push(item2)
+     * q.push(item3)
+     * // queues are iterable, spread into an array to inspect
+     * const items = [...q] // [item1, item2, item3]
+     * // or use for of
+     * for (let item of q) {
+     *     console.log(item)
+     * }
+     */
+
+    /**
+     * Creates a `queue` object with the specified `concurrency`. Tasks added to the
+     * `queue` are processed in parallel (up to the `concurrency` limit). If all
+     * `worker`s are in progress, the task is queued until one becomes available.
+     * Once a `worker` completes a `task`, that `task`'s callback is called.
+     *
+     * @name queue
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {AsyncFunction} worker - An async function for processing a queued task.
+     * If you want to handle errors from an individual task, pass a callback to
+     * `q.push()`. Invoked with (task, callback).
+     * @param {number} [concurrency=1] - An `integer` for determining how many
+     * `worker` functions should be run in parallel.  If omitted, the concurrency
+     * defaults to `1`.  If the concurrency is `0`, an error is thrown.
+     * @returns {module:ControlFlow.QueueObject} A queue object to manage the tasks. Callbacks can be
+     * attached as certain properties to listen for specific events during the
+     * lifecycle of the queue.
+     * @example
+     *
+     * // create a queue object with concurrency 2
+     * var q = async.queue(function(task, callback) {
+     *     console.log('hello ' + task.name);
+     *     callback();
+     * }, 2);
+     *
+     * // assign a callback
+     * q.drain = function() {
+     *     console.log('all items have been processed');
+     * };
+     *
+     * // assign an error callback
+     * q.error = function(err, task) {
+     *     console.error('task experienced an error');
+     * };
+     *
+     * // add some items to the queue
+     * q.push({name: 'foo'}, function(err) {
+     *     console.log('finished processing foo');
+     * });
+     * q.push({name: 'bar'}, function (err) {
+     *     console.log('finished processing bar');
+     * });
+     *
+     * // add some items to the queue (batch-wise)
+     * q.push([{name: 'baz'},{name: 'bay'},{name: 'bax'}], function(err) {
+     *     console.log('finished processing item');
+     * });
+     *
+     * // add some items to the front of the queue
+     * q.unshift({name: 'bar'}, function (err) {
+     *     console.log('finished processing bar');
+     * });
+     */
+    function queue$1 (worker, concurrency) {
+        var _worker = wrapAsync(worker);
+        return queue((items, cb) => {
+            _worker(items[0], cb);
+        }, concurrency, 1);
+    }
 
-            if (nextNode) {
-                q._tasks.insertBefore(nextNode, item);
-            } else {
-                q._tasks.push(item);
+    /**
+     * The same as [async.queue]{@link module:ControlFlow.queue} only tasks are assigned a priority and
+     * completed in ascending priority order.
+     *
+     * @name priorityQueue
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.queue]{@link module:ControlFlow.queue}
+     * @category Control Flow
+     * @param {AsyncFunction} worker - An async function for processing a queued task.
+     * If you want to handle errors from an individual task, pass a callback to
+     * `q.push()`.
+     * Invoked with (task, callback).
+     * @param {number} concurrency - An `integer` for determining how many `worker`
+     * functions should be run in parallel.  If omitted, the concurrency defaults to
+     * `1`.  If the concurrency is `0`, an error is thrown.
+     * @returns {module:ControlFlow.QueueObject} A priorityQueue object to manage the tasks. There are two
+     * differences between `queue` and `priorityQueue` objects:
+     * * `push(task, priority, [callback])` - `priority` should be a number. If an
+     *   array of `tasks` is given, all tasks will be assigned the same priority.
+     * * The `unshift` method was removed.
+     */
+    function priorityQueue(worker, concurrency) {
+        // Start with a normal queue
+        var q = queue$1(worker, concurrency);
+
+        // Override push to accept second parameter representing priority
+        q.push = function(data, priority = 0, callback = () => {}) {
+            if (typeof callback !== 'function') {
+                throw new Error('task callback must be a function');
+            }
+            q.started = true;
+            if (!Array.isArray(data)) {
+                data = [data];
+            }
+            if (data.length === 0) {
+                // call drain immediately if there are no tasks
+                return setImmediate$1(() => q.drain());
             }
-        }
-        setImmediate$1(q.process);
-    };
 
-    // Remove unshift function
-    delete q.unshift;
-
-    return q;
-};
-
-/**
- * Runs the `tasks` array of functions in parallel, without waiting until the
- * previous function has completed. Once any of the `tasks` complete or pass an
- * error to its callback, the main `callback` is immediately called. It's
- * equivalent to `Promise.race()`.
- *
- * @name race
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Array} tasks - An array containing [async functions]{@link AsyncFunction}
- * to run. Each function can complete with an optional `result` value.
- * @param {Function} callback - A callback to run once any of the functions have
- * completed. This function gets an error or result from the first function that
- * completed. Invoked with (err, result).
- * @returns undefined
- * @example
- *
- * async.race([
- *     function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'one');
- *         }, 200);
- *     },
- *     function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'two');
- *         }, 100);
- *     }
- * ],
- * // main callback
- * function(err, result) {
- *     // the result will be equal to 'two' as it finishes earlier
- * });
- */
-function race(tasks, callback) {
-    callback = once(callback || noop);
-    if (!isArray(tasks)) return callback(new TypeError('First argument to race must be an array of functions'));
-    if (!tasks.length) return callback();
-    for (var i = 0, l = tasks.length; i < l; i++) {
-        wrapAsync(tasks[i])(callback);
-    }
-}
-
-/**
- * Same as [`reduce`]{@link module:Collections.reduce}, only operates on `array` in reverse order.
- *
- * @name reduceRight
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.reduce]{@link module:Collections.reduce}
- * @alias foldr
- * @category Collection
- * @param {Array} array - A collection to iterate over.
- * @param {*} memo - The initial state of the reduction.
- * @param {AsyncFunction} iteratee - A function applied to each item in the
- * array to produce the next step in the reduction.
- * The `iteratee` should complete with the next state of the reduction.
- * If the iteratee complete with an error, the reduction is stopped and the
- * main `callback` is immediately called with the error.
- * Invoked with (memo, item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Result is the reduced value. Invoked with
- * (err, result).
- */
-function reduceRight (array, memo, iteratee, callback) {
-    var reversed = slice(array).reverse();
-    reduce(reversed, memo, iteratee, callback);
-}
-
-/**
- * Wraps the async function in another function that always completes with a
- * result object, even when it errors.
- *
- * The result object has either the property `error` or `value`.
- *
- * @name reflect
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {AsyncFunction} fn - The async function you want to wrap
- * @returns {Function} - A function that always passes null to it's callback as
- * the error. The second argument to the callback will be an `object` with
- * either an `error` or a `value` property.
- * @example
- *
- * async.parallel([
- *     async.reflect(function(callback) {
- *         // do some stuff ...
- *         callback(null, 'one');
- *     }),
- *     async.reflect(function(callback) {
- *         // do some more stuff but error ...
- *         callback('bad stuff happened');
- *     }),
- *     async.reflect(function(callback) {
- *         // do some more stuff ...
- *         callback(null, 'two');
- *     })
- * ],
- * // optional callback
- * function(err, results) {
- *     // values
- *     // results[0].value = 'one'
- *     // results[1].error = 'bad stuff happened'
- *     // results[2].value = 'two'
- * });
- */
-function reflect(fn) {
-    var _fn = wrapAsync(fn);
-    return initialParams(function reflectOn(args, reflectCallback) {
-        args.push(function callback(error, cbArg) {
-            if (error) {
-                reflectCallback(null, { error: error });
-            } else {
-                var value;
-                if (arguments.length <= 2) {
-                    value = cbArg;
+            var nextNode = q._tasks.head;
+            while (nextNode && priority >= nextNode.priority) {
+                nextNode = nextNode.next;
+            }
+
+            for (var i = 0, l = data.length; i < l; i++) {
+                var item = {
+                    data: data[i],
+                    priority,
+                    callback
+                };
+
+                if (nextNode) {
+                    q._tasks.insertBefore(nextNode, item);
                 } else {
-                    value = slice(arguments, 1);
+                    q._tasks.push(item);
                 }
-                reflectCallback(null, { value: value });
             }
-        });
+            setImmediate$1(q.process);
+        };
 
-        return _fn.apply(this, args);
-    });
-}
-
-/**
- * A helper function that wraps an array or an object of functions with `reflect`.
- *
- * @name reflectAll
- * @static
- * @memberOf module:Utils
- * @method
- * @see [async.reflect]{@link module:Utils.reflect}
- * @category Util
- * @param {Array|Object|Iterable} tasks - The collection of
- * [async functions]{@link AsyncFunction} to wrap in `async.reflect`.
- * @returns {Array} Returns an array of async functions, each wrapped in
- * `async.reflect`
- * @example
- *
- * let tasks = [
- *     function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'one');
- *         }, 200);
- *     },
- *     function(callback) {
- *         // do some more stuff but error ...
- *         callback(new Error('bad stuff happened'));
- *     },
- *     function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'two');
- *         }, 100);
- *     }
- * ];
- *
- * async.parallel(async.reflectAll(tasks),
- * // optional callback
- * function(err, results) {
- *     // values
- *     // results[0].value = 'one'
- *     // results[1].error = Error('bad stuff happened')
- *     // results[2].value = 'two'
- * });
- *
- * // an example using an object instead of an array
- * let tasks = {
- *     one: function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'one');
- *         }, 200);
- *     },
- *     two: function(callback) {
- *         callback('two');
- *     },
- *     three: function(callback) {
- *         setTimeout(function() {
- *             callback(null, 'three');
- *         }, 100);
- *     }
- * };
- *
- * async.parallel(async.reflectAll(tasks),
- * // optional callback
- * function(err, results) {
- *     // values
- *     // results.one.value = 'one'
- *     // results.two.error = 'two'
- *     // results.three.value = 'three'
- * });
- */
-function reflectAll(tasks) {
-    var results;
-    if (isArray(tasks)) {
-        results = arrayMap(tasks, reflect);
-    } else {
-        results = {};
-        baseForOwn(tasks, function(task, key) {
-            results[key] = reflect.call(this, task);
-        });
+        // Remove unshift function
+        delete q.unshift;
+
+        return q;
+    }
+
+    /**
+     * Runs the `tasks` array of functions in parallel, without waiting until the
+     * previous function has completed. Once any of the `tasks` complete or pass an
+     * error to its callback, the main `callback` is immediately called. It's
+     * equivalent to `Promise.race()`.
+     *
+     * @name race
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {Array} tasks - An array containing [async functions]{@link AsyncFunction}
+     * to run. Each function can complete with an optional `result` value.
+     * @param {Function} callback - A callback to run once any of the functions have
+     * completed. This function gets an error or result from the first function that
+     * completed. Invoked with (err, result).
+     * @returns undefined
+     * @example
+     *
+     * async.race([
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'one');
+     *         }, 200);
+     *     },
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'two');
+     *         }, 100);
+     *     }
+     * ],
+     * // main callback
+     * function(err, result) {
+     *     // the result will be equal to 'two' as it finishes earlier
+     * });
+     */
+    function race(tasks, callback) {
+        callback = once(callback);
+        if (!Array.isArray(tasks)) return callback(new TypeError('First argument to race must be an array of functions'));
+        if (!tasks.length) return callback();
+        for (var i = 0, l = tasks.length; i < l; i++) {
+            wrapAsync(tasks[i])(callback);
+        }
+    }
+
+    var race$1 = awaitify(race, 2);
+
+    /**
+     * Same as [`reduce`]{@link module:Collections.reduce}, only operates on `array` in reverse order.
+     *
+     * @name reduceRight
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.reduce]{@link module:Collections.reduce}
+     * @alias foldr
+     * @category Collection
+     * @param {Array} array - A collection to iterate over.
+     * @param {*} memo - The initial state of the reduction.
+     * @param {AsyncFunction} iteratee - A function applied to each item in the
+     * array to produce the next step in the reduction.
+     * The `iteratee` should complete with the next state of the reduction.
+     * If the iteratee complete with an error, the reduction is stopped and the
+     * main `callback` is immediately called with the error.
+     * Invoked with (memo, item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result is the reduced value. Invoked with
+     * (err, result).
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function reduceRight (array, memo, iteratee, callback) {
+        var reversed = [...array].reverse();
+        return reduce$1(reversed, memo, iteratee, callback);
     }
-    return results;
-}
 
-function reject$1(eachfn, arr, iteratee, callback) {
-    _filter(eachfn, arr, function(value, cb) {
-        iteratee(value, function(err, v) {
-            cb(err, !v);
+    /**
+     * Wraps the async function in another function that always completes with a
+     * result object, even when it errors.
+     *
+     * The result object has either the property `error` or `value`.
+     *
+     * @name reflect
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {AsyncFunction} fn - The async function you want to wrap
+     * @returns {Function} - A function that always passes null to it's callback as
+     * the error. The second argument to the callback will be an `object` with
+     * either an `error` or a `value` property.
+     * @example
+     *
+     * async.parallel([
+     *     async.reflect(function(callback) {
+     *         // do some stuff ...
+     *         callback(null, 'one');
+     *     }),
+     *     async.reflect(function(callback) {
+     *         // do some more stuff but error ...
+     *         callback('bad stuff happened');
+     *     }),
+     *     async.reflect(function(callback) {
+     *         // do some more stuff ...
+     *         callback(null, 'two');
+     *     })
+     * ],
+     * // optional callback
+     * function(err, results) {
+     *     // values
+     *     // results[0].value = 'one'
+     *     // results[1].error = 'bad stuff happened'
+     *     // results[2].value = 'two'
+     * });
+     */
+    function reflect(fn) {
+        var _fn = wrapAsync(fn);
+        return initialParams(function reflectOn(args, reflectCallback) {
+            args.push((error, ...cbArgs) => {
+                if (error) {
+                    return reflectCallback(null, { error });
+                }
+                var value = cbArgs;
+                if (cbArgs.length <= 1) {
+                    [value] = cbArgs;
+                }
+                reflectCallback(null, { value });
+            });
+
+            return _fn.apply(this, args);
         });
-    }, callback);
-}
-
-/**
- * The opposite of [`filter`]{@link module:Collections.filter}. Removes values that pass an `async` truth test.
- *
- * @name reject
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.filter]{@link module:Collections.filter}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {Function} iteratee - An async truth test to apply to each item in
- * `coll`.
- * The should complete with a boolean value as its `result`.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Invoked with (err, results).
- * @example
- *
- * async.reject(['file1','file2','file3'], function(filePath, callback) {
- *     fs.access(filePath, function(err) {
- *         callback(null, !err)
- *     });
- * }, function(err, results) {
- *     // results now equals an array of missing files
- *     createFiles(results);
- * });
- */
-var reject = doParallel(reject$1);
-
-/**
- * The same as [`reject`]{@link module:Collections.reject} but runs a maximum of `limit` async operations at a
- * time.
- *
- * @name rejectLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.reject]{@link module:Collections.reject}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {Function} iteratee - An async truth test to apply to each item in
- * `coll`.
- * The should complete with a boolean value as its `result`.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Invoked with (err, results).
- */
-var rejectLimit = doParallelLimit(reject$1);
-
-/**
- * The same as [`reject`]{@link module:Collections.reject} but runs only a single async operation at a time.
- *
- * @name rejectSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.reject]{@link module:Collections.reject}
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {Function} iteratee - An async truth test to apply to each item in
- * `coll`.
- * The should complete with a boolean value as its `result`.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Invoked with (err, results).
- */
-var rejectSeries = doLimit(rejectLimit, 1);
-
-/**
- * Creates a function that returns `value`.
- *
- * @static
- * @memberOf _
- * @since 2.4.0
- * @category Util
- * @param {*} value The value to return from the new function.
- * @returns {Function} Returns the new constant function.
- * @example
- *
- * var objects = _.times(2, _.constant({ 'a': 1 }));
- *
- * console.log(objects);
- * // => [{ 'a': 1 }, { 'a': 1 }]
- *
- * console.log(objects[0] === objects[1]);
- * // => true
- */
-function constant$1(value) {
-  return function() {
-    return value;
-  };
-}
-
-/**
- * Attempts to get a successful response from `task` no more than `times` times
- * before returning an error. If the task is successful, the `callback` will be
- * passed the result of the successful task. If all attempts fail, the callback
- * will be passed the error and result (if any) of the final attempt.
- *
- * @name retry
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @see [async.retryable]{@link module:ControlFlow.retryable}
- * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - Can be either an
- * object with `times` and `interval` or a number.
- * * `times` - The number of attempts to make before giving up.  The default
- *   is `5`.
- * * `interval` - The time to wait between retries, in milliseconds.  The
- *   default is `0`. The interval may also be specified as a function of the
- *   retry count (see example).
- * * `errorFilter` - An optional synchronous function that is invoked on
- *   erroneous result. If it returns `true` the retry attempts will continue;
- *   if the function returns `false` the retry flow is aborted with the current
- *   attempt's error and result being returned to the final callback.
- *   Invoked with (err).
- * * If `opts` is a number, the number specifies the number of times to retry,
- *   with the default interval of `0`.
- * @param {AsyncFunction} task - An async function to retry.
- * Invoked with (callback).
- * @param {Function} [callback] - An optional callback which is called when the
- * task has succeeded, or after the final failed attempt. It receives the `err`
- * and `result` arguments of the last attempt at completing the `task`. Invoked
- * with (err, results).
- *
- * @example
- *
- * // The `retry` function can be used as a stand-alone control flow by passing
- * // a callback, as shown below:
- *
- * // try calling apiMethod 3 times
- * async.retry(3, apiMethod, function(err, result) {
- *     // do something with the result
- * });
- *
- * // try calling apiMethod 3 times, waiting 200 ms between each retry
- * async.retry({times: 3, interval: 200}, apiMethod, function(err, result) {
- *     // do something with the result
- * });
- *
- * // try calling apiMethod 10 times with exponential backoff
- * // (i.e. intervals of 100, 200, 400, 800, 1600, ... milliseconds)
- * async.retry({
- *   times: 10,
- *   interval: function(retryCount) {
- *     return 50 * Math.pow(2, retryCount);
- *   }
- * }, apiMethod, function(err, result) {
- *     // do something with the result
- * });
- *
- * // try calling apiMethod the default 5 times no delay between each retry
- * async.retry(apiMethod, function(err, result) {
- *     // do something with the result
- * });
- *
- * // try calling apiMethod only when error condition satisfies, all other
- * // errors will abort the retry control flow and return to final callback
- * async.retry({
- *   errorFilter: function(err) {
- *     return err.message === 'Temporary error'; // only retry on a specific error
- *   }
- * }, apiMethod, function(err, result) {
- *     // do something with the result
- * });
- *
- * // to retry individual methods that are not as reliable within other
- * // control flow functions, use the `retryable` wrapper:
- * async.auto({
- *     users: api.getUsers.bind(api),
- *     payments: async.retryable(3, api.getPayments.bind(api))
- * }, function(err, results) {
- *     // do something with the results
- * });
- *
- */
-function retry(opts, task, callback) {
-    var DEFAULT_TIMES = 5;
-    var DEFAULT_INTERVAL = 0;
-
-    var options = {
-        times: DEFAULT_TIMES,
-        intervalFunc: constant$1(DEFAULT_INTERVAL)
-    };
+    }
+
+    /**
+     * A helper function that wraps an array or an object of functions with `reflect`.
+     *
+     * @name reflectAll
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @see [async.reflect]{@link module:Utils.reflect}
+     * @category Util
+     * @param {Array|Object|Iterable} tasks - The collection of
+     * [async functions]{@link AsyncFunction} to wrap in `async.reflect`.
+     * @returns {Array} Returns an array of async functions, each wrapped in
+     * `async.reflect`
+     * @example
+     *
+     * let tasks = [
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'one');
+     *         }, 200);
+     *     },
+     *     function(callback) {
+     *         // do some more stuff but error ...
+     *         callback(new Error('bad stuff happened'));
+     *     },
+     *     function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'two');
+     *         }, 100);
+     *     }
+     * ];
+     *
+     * async.parallel(async.reflectAll(tasks),
+     * // optional callback
+     * function(err, results) {
+     *     // values
+     *     // results[0].value = 'one'
+     *     // results[1].error = Error('bad stuff happened')
+     *     // results[2].value = 'two'
+     * });
+     *
+     * // an example using an object instead of an array
+     * let tasks = {
+     *     one: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'one');
+     *         }, 200);
+     *     },
+     *     two: function(callback) {
+     *         callback('two');
+     *     },
+     *     three: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 'three');
+     *         }, 100);
+     *     }
+     * };
+     *
+     * async.parallel(async.reflectAll(tasks),
+     * // optional callback
+     * function(err, results) {
+     *     // values
+     *     // results.one.value = 'one'
+     *     // results.two.error = 'two'
+     *     // results.three.value = 'three'
+     * });
+     */
+    function reflectAll(tasks) {
+        var results;
+        if (Array.isArray(tasks)) {
+            results = tasks.map(reflect);
+        } else {
+            results = {};
+            Object.keys(tasks).forEach(key => {
+                results[key] = reflect.call(this, tasks[key]);
+            });
+        }
+        return results;
+    }
+
+    function reject(eachfn, arr, _iteratee, callback) {
+        const iteratee = wrapAsync(_iteratee);
+        return _filter(eachfn, arr, (value, cb) => {
+            iteratee(value, (err, v) => {
+                cb(err, !v);
+            });
+        }, callback);
+    }
+
+    /**
+     * The opposite of [`filter`]{@link module:Collections.filter}. Removes values that pass an `async` truth test.
+     *
+     * @name reject
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.filter]{@link module:Collections.filter}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - An async truth test to apply to each item in
+     * `coll`.
+     * The should complete with a boolean value as its `result`.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     *
+     * async.reject(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, results) {
+     *     // results now equals an array of missing files
+     *     createFiles(results);
+     * });
+     */
+    function reject$1 (coll, iteratee, callback) {
+        return reject(eachOf$1, coll, iteratee, callback)
+    }
+    var reject$2 = awaitify(reject$1, 3);
+
+    /**
+     * The same as [`reject`]{@link module:Collections.reject} but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name rejectLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.reject]{@link module:Collections.reject}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {Function} iteratee - An async truth test to apply to each item in
+     * `coll`.
+     * The should complete with a boolean value as its `result`.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function rejectLimit (coll, limit, iteratee, callback) {
+        return reject(eachOfLimit(limit), coll, iteratee, callback)
+    }
+    var rejectLimit$1 = awaitify(rejectLimit, 4);
+
+    /**
+     * The same as [`reject`]{@link module:Collections.reject} but runs only a single async operation at a time.
+     *
+     * @name rejectSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.reject]{@link module:Collections.reject}
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {Function} iteratee - An async truth test to apply to each item in
+     * `coll`.
+     * The should complete with a boolean value as its `result`.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback is passed
+     */
+    function rejectSeries (coll, iteratee, callback) {
+        return reject(eachOfSeries$1, coll, iteratee, callback)
+    }
+    var rejectSeries$1 = awaitify(rejectSeries, 3);
+
+    function constant$1(value) {
+        return function () {
+            return value;
+        }
+    }
+
+    /**
+     * Attempts to get a successful response from `task` no more than `times` times
+     * before returning an error. If the task is successful, the `callback` will be
+     * passed the result of the successful task. If all attempts fail, the callback
+     * will be passed the error and result (if any) of the final attempt.
+     *
+     * @name retry
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @see [async.retryable]{@link module:ControlFlow.retryable}
+     * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - Can be either an
+     * object with `times` and `interval` or a number.
+     * * `times` - The number of attempts to make before giving up.  The default
+     *   is `5`.
+     * * `interval` - The time to wait between retries, in milliseconds.  The
+     *   default is `0`. The interval may also be specified as a function of the
+     *   retry count (see example).
+     * * `errorFilter` - An optional synchronous function that is invoked on
+     *   erroneous result. If it returns `true` the retry attempts will continue;
+     *   if the function returns `false` the retry flow is aborted with the current
+     *   attempt's error and result being returned to the final callback.
+     *   Invoked with (err).
+     * * If `opts` is a number, the number specifies the number of times to retry,
+     *   with the default interval of `0`.
+     * @param {AsyncFunction} task - An async function to retry.
+     * Invoked with (callback).
+     * @param {Function} [callback] - An optional callback which is called when the
+     * task has succeeded, or after the final failed attempt. It receives the `err`
+     * and `result` arguments of the last attempt at completing the `task`. Invoked
+     * with (err, results).
+     * @returns {Promise} a promise if no callback provided
+     *
+     * @example
+     *
+     * // The `retry` function can be used as a stand-alone control flow by passing
+     * // a callback, as shown below:
+     *
+     * // try calling apiMethod 3 times
+     * async.retry(3, apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     * // try calling apiMethod 3 times, waiting 200 ms between each retry
+     * async.retry({times: 3, interval: 200}, apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     * // try calling apiMethod 10 times with exponential backoff
+     * // (i.e. intervals of 100, 200, 400, 800, 1600, ... milliseconds)
+     * async.retry({
+     *   times: 10,
+     *   interval: function(retryCount) {
+     *     return 50 * Math.pow(2, retryCount);
+     *   }
+     * }, apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     * // try calling apiMethod the default 5 times no delay between each retry
+     * async.retry(apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     * // try calling apiMethod only when error condition satisfies, all other
+     * // errors will abort the retry control flow and return to final callback
+     * async.retry({
+     *   errorFilter: function(err) {
+     *     return err.message === 'Temporary error'; // only retry on a specific error
+     *   }
+     * }, apiMethod, function(err, result) {
+     *     // do something with the result
+     * });
+     *
+     * // to retry individual methods that are not as reliable within other
+     * // control flow functions, use the `retryable` wrapper:
+     * async.auto({
+     *     users: api.getUsers.bind(api),
+     *     payments: async.retryable(3, api.getPayments.bind(api))
+     * }, function(err, results) {
+     *     // do something with the results
+     * });
+     *
+     */
+    const DEFAULT_TIMES = 5;
+    const DEFAULT_INTERVAL = 0;
+
+    function retry(opts, task, callback) {
+        var options = {
+            times: DEFAULT_TIMES,
+            intervalFunc: constant$1(DEFAULT_INTERVAL)
+        };
+
+        if (arguments.length < 3 && typeof opts === 'function') {
+            callback = task || promiseCallback();
+            task = opts;
+        } else {
+            parseTimes(options, opts);
+            callback = callback || promiseCallback();
+        }
+
+        if (typeof task !== 'function') {
+            throw new Error("Invalid arguments for async.retry");
+        }
+
+        var _task = wrapAsync(task);
+
+        var attempt = 1;
+        function retryAttempt() {
+            _task((err, ...args) => {
+                if (err === false) return
+                if (err && attempt++ < options.times &&
+                    (typeof options.errorFilter != 'function' ||
+                        options.errorFilter(err))) {
+                    setTimeout(retryAttempt, options.intervalFunc(attempt));
+                } else {
+                    callback(err, ...args);
+                }
+            });
+        }
+
+        retryAttempt();
+        return callback[PROMISE_SYMBOL]
+    }
 
     function parseTimes(acc, t) {
         if (typeof t === 'object') {
@@ -4592,1018 +3630,1004 @@ function retry(opts, task, callback) {
         }
     }
 
-    if (arguments.length < 3 && typeof opts === 'function') {
-        callback = task || noop;
-        task = opts;
-    } else {
-        parseTimes(options, opts);
-        callback = callback || noop;
+    /**
+     * A close relative of [`retry`]{@link module:ControlFlow.retry}.  This method
+     * wraps a task and makes it retryable, rather than immediately calling it
+     * with retries.
+     *
+     * @name retryable
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.retry]{@link module:ControlFlow.retry}
+     * @category Control Flow
+     * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - optional
+     * options, exactly the same as from `retry`, except for a `opts.arity` that
+     * is the arity of the `task` function, defaulting to `task.length`
+     * @param {AsyncFunction} task - the asynchronous function to wrap.
+     * This function will be passed any arguments passed to the returned wrapper.
+     * Invoked with (...args, callback).
+     * @returns {AsyncFunction} The wrapped function, which when invoked, will
+     * retry on an error, based on the parameters specified in `opts`.
+     * This function will accept the same parameters as `task`.
+     * @example
+     *
+     * async.auto({
+     *     dep1: async.retryable(3, getFromFlakyService),
+     *     process: ["dep1", async.retryable(3, function (results, cb) {
+     *         maybeProcessData(results.dep1, cb);
+     *     })]
+     * }, callback);
+     */
+    function retryable (opts, task) {
+        if (!task) {
+            task = opts;
+            opts = null;
+        }
+        let arity = (opts && opts.arity) || task.length;
+        if (isAsync(task)) {
+            arity += 1;
+        }
+        var _task = wrapAsync(task);
+        return initialParams((args, callback) => {
+            if (args.length < arity - 1 || callback == null) {
+                args.push(callback);
+                callback = promiseCallback();
+            }
+            function taskFn(cb) {
+                _task(...args, cb);
+            }
+
+            if (opts) retry(opts, taskFn, callback);
+            else retry(taskFn, callback);
+
+            return callback[PROMISE_SYMBOL]
+        });
     }
 
-    if (typeof task !== 'function') {
-        throw new Error("Invalid arguments for async.retry");
+    /**
+     * Run the functions in the `tasks` collection in series, each one running once
+     * the previous function has completed. If any functions in the series pass an
+     * error to its callback, no more functions are run, and `callback` is
+     * immediately called with the value of the error. Otherwise, `callback`
+     * receives an array of results when `tasks` have completed.
+     *
+     * It is also possible to use an object instead of an array. Each property will
+     * be run as a function, and the results will be passed to the final `callback`
+     * as an object instead of an array. This can be a more readable way of handling
+     *  results from {@link async.series}.
+     *
+     * **Note** that while many implementations preserve the order of object
+     * properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)
+     * explicitly states that
+     *
+     * > The mechanics and order of enumerating the properties is not specified.
+     *
+     * So if you rely on the order in which your series of functions are executed,
+     * and want this to work on all platforms, consider using an array.
+     *
+     * @name series
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {Array|Iterable|AsyncIterable|Object} tasks - A collection containing
+     * [async functions]{@link AsyncFunction} to run in series.
+     * Each function can complete with any number of optional `result` values.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed. This function gets a results array (or object)
+     * containing all the result arguments passed to the `task` callbacks. Invoked
+     * with (err, result).
+     * @return {Promise} a promise, if no callback is passed
+     * @example
+     * async.series([
+     *     function(callback) {
+     *         // do some stuff ...
+     *         callback(null, 'one');
+     *     },
+     *     function(callback) {
+     *         // do some more stuff ...
+     *         callback(null, 'two');
+     *     }
+     * ],
+     * // optional callback
+     * function(err, results) {
+     *     // results is now equal to ['one', 'two']
+     * });
+     *
+     * async.series({
+     *     one: function(callback) {
+     *         setTimeout(function() {
+     *             callback(null, 1);
+     *         }, 200);
+     *     },
+     *     two: function(callback){
+     *         setTimeout(function() {
+     *             callback(null, 2);
+     *         }, 100);
+     *     }
+     * }, function(err, results) {
+     *     // results is now equal to: {one: 1, two: 2}
+     * });
+     */
+    function series(tasks, callback) {
+        return _parallel(eachOfSeries$1, tasks, callback);
     }
 
-    var _task = wrapAsync(task);
+    /**
+     * Returns `true` if at least one element in the `coll` satisfies an async test.
+     * If any iteratee call returns `true`, the main `callback` is immediately
+     * called.
+     *
+     * @name some
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @alias any
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async truth test to apply to each item
+     * in the collections in parallel.
+     * The iteratee should complete with a boolean `result` value.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the iteratee functions have finished.
+     * Result will be either `true` or `false` depending on the values of the async
+     * tests. Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback provided
+     * @example
+     *
+     * async.some(['file1','file2','file3'], function(filePath, callback) {
+     *     fs.access(filePath, function(err) {
+     *         callback(null, !err)
+     *     });
+     * }, function(err, result) {
+     *     // if result is true then at least one of the files exists
+     * });
+     */
+    function some(coll, iteratee, callback) {
+        return _createTester(Boolean, res => res)(eachOf$1, coll, iteratee, callback)
+    }
+    var some$1 = awaitify(some, 3);
+
+    /**
+     * The same as [`some`]{@link module:Collections.some} but runs a maximum of `limit` async operations at a time.
+     *
+     * @name someLimit
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.some]{@link module:Collections.some}
+     * @alias anyLimit
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - An async truth test to apply to each item
+     * in the collections in parallel.
+     * The iteratee should complete with a boolean `result` value.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the iteratee functions have finished.
+     * Result will be either `true` or `false` depending on the values of the async
+     * tests. Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback provided
+     */
+    function someLimit(coll, limit, iteratee, callback) {
+        return _createTester(Boolean, res => res)(eachOfLimit(limit), coll, iteratee, callback)
+    }
+    var someLimit$1 = awaitify(someLimit, 4);
+
+    /**
+     * The same as [`some`]{@link module:Collections.some} but runs only a single async operation at a time.
+     *
+     * @name someSeries
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @see [async.some]{@link module:Collections.some}
+     * @alias anySeries
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async truth test to apply to each item
+     * in the collections in series.
+     * The iteratee should complete with a boolean `result` value.
+     * Invoked with (item, callback).
+     * @param {Function} [callback] - A callback which is called as soon as any
+     * iteratee returns `true`, or after all the iteratee functions have finished.
+     * Result will be either `true` or `false` depending on the values of the async
+     * tests. Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback provided
+     */
+    function someSeries(coll, iteratee, callback) {
+        return _createTester(Boolean, res => res)(eachOfSeries$1, coll, iteratee, callback)
+    }
+    var someSeries$1 = awaitify(someSeries, 3);
+
+    /**
+     * Sorts a list by the results of running each `coll` value through an async
+     * `iteratee`.
+     *
+     * @name sortBy
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {AsyncFunction} iteratee - An async function to apply to each item in
+     * `coll`.
+     * The iteratee should complete with a value to use as the sort criteria as
+     * its `result`.
+     * Invoked with (item, callback).
+     * @param {Function} callback - A callback which is called after all the
+     * `iteratee` functions have finished, or an error occurs. Results is the items
+     * from the original `coll` sorted by the values returned by the `iteratee`
+     * calls. Invoked with (err, results).
+     * @returns {Promise} a promise, if no callback passed
+     * @example
+     *
+     * async.sortBy(['file1','file2','file3'], function(file, callback) {
+     *     fs.stat(file, function(err, stats) {
+     *         callback(err, stats.mtime);
+     *     });
+     * }, function(err, results) {
+     *     // results is now the original array of files sorted by
+     *     // modified date
+     * });
+     *
+     * // By modifying the callback parameter the
+     * // sorting order can be influenced:
+     *
+     * // ascending order
+     * async.sortBy([1,9,3,5], function(x, callback) {
+     *     callback(null, x);
+     * }, function(err,result) {
+     *     // result callback
+     * });
+     *
+     * // descending order
+     * async.sortBy([1,9,3,5], function(x, callback) {
+     *     callback(null, x*-1);    //<- x*-1 instead of x, turns the order around
+     * }, function(err,result) {
+     *     // result callback
+     * });
+     */
+    function sortBy (coll, iteratee, callback) {
+        var _iteratee = wrapAsync(iteratee);
+        return map$1(coll, (x, iterCb) => {
+            _iteratee(x, (err, criteria) => {
+                if (err) return iterCb(err);
+                iterCb(null, {value: x, criteria});
+            });
+        }, (err, results) => {
+            if (err) return callback(err);
+            callback(null, results.sort(comparator).map(v => v.value));
+        });
 
-    var attempt = 1;
-    function retryAttempt() {
-        _task(function(err) {
-            if (err && attempt++ < options.times &&
-                (typeof options.errorFilter != 'function' ||
-                    options.errorFilter(err))) {
-                setTimeout(retryAttempt, options.intervalFunc(attempt));
-            } else {
-                callback.apply(null, arguments);
+        function comparator(left, right) {
+            var a = left.criteria, b = right.criteria;
+            return a < b ? -1 : a > b ? 1 : 0;
+        }
+    }
+    var sortBy$1 = awaitify(sortBy, 3);
+
+    /**
+     * Sets a time limit on an asynchronous function. If the function does not call
+     * its callback within the specified milliseconds, it will be called with a
+     * timeout error. The code property for the error object will be `'ETIMEDOUT'`.
+     *
+     * @name timeout
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @category Util
+     * @param {AsyncFunction} asyncFn - The async function to limit in time.
+     * @param {number} milliseconds - The specified time limit.
+     * @param {*} [info] - Any variable you want attached (`string`, `object`, etc)
+     * to timeout Error for more information..
+     * @returns {AsyncFunction} Returns a wrapped function that can be used with any
+     * of the control flow functions.
+     * Invoke this function with the same parameters as you would `asyncFunc`.
+     * @example
+     *
+     * function myFunction(foo, callback) {
+     *     doAsyncTask(foo, function(err, data) {
+     *         // handle errors
+     *         if (err) return callback(err);
+     *
+     *         // do some stuff ...
+     *
+     *         // return processed data
+     *         return callback(null, data);
+     *     });
+     * }
+     *
+     * var wrapped = async.timeout(myFunction, 1000);
+     *
+     * // call `wrapped` as you would `myFunction`
+     * wrapped({ bar: 'bar' }, function(err, data) {
+     *     // if `myFunction` takes < 1000 ms to execute, `err`
+     *     // and `data` will have their expected values
+     *
+     *     // else `err` will be an Error with the code 'ETIMEDOUT'
+     * });
+     */
+    function timeout(asyncFn, milliseconds, info) {
+        var fn = wrapAsync(asyncFn);
+
+        return initialParams((args, callback) => {
+            var timedOut = false;
+            var timer;
+
+            function timeoutCallback() {
+                var name = asyncFn.name || 'anonymous';
+                var error  = new Error('Callback function "' + name + '" timed out.');
+                error.code = 'ETIMEDOUT';
+                if (info) {
+                    error.info = info;
+                }
+                timedOut = true;
+                callback(error);
             }
+
+            args.push((...cbArgs) => {
+                if (!timedOut) {
+                    callback(...cbArgs);
+                    clearTimeout(timer);
+                }
+            });
+
+            // setup timer and call original function
+            timer = setTimeout(timeoutCallback, milliseconds);
+            fn(...args);
         });
     }
 
-    retryAttempt();
-}
-
-/**
- * A close relative of [`retry`]{@link module:ControlFlow.retry}.  This method
- * wraps a task and makes it retryable, rather than immediately calling it
- * with retries.
- *
- * @name retryable
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.retry]{@link module:ControlFlow.retry}
- * @category Control Flow
- * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - optional
- * options, exactly the same as from `retry`
- * @param {AsyncFunction} task - the asynchronous function to wrap.
- * This function will be passed any arguments passed to the returned wrapper.
- * Invoked with (...args, callback).
- * @returns {AsyncFunction} The wrapped function, which when invoked, will
- * retry on an error, based on the parameters specified in `opts`.
- * This function will accept the same parameters as `task`.
- * @example
- *
- * async.auto({
- *     dep1: async.retryable(3, getFromFlakyService),
- *     process: ["dep1", async.retryable(3, function (results, cb) {
- *         maybeProcessData(results.dep1, cb);
- *     })]
- * }, callback);
- */
-var retryable = function (opts, task) {
-    if (!task) {
-        task = opts;
-        opts = null;
+    function range(size) {
+        var result = Array(size);
+        while (size--) {
+            result[size] = size;
+        }
+        return result;
+    }
+
+    /**
+     * The same as [times]{@link module:ControlFlow.times} but runs a maximum of `limit` async operations at a
+     * time.
+     *
+     * @name timesLimit
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.times]{@link module:ControlFlow.times}
+     * @category Control Flow
+     * @param {number} count - The number of times to run the function.
+     * @param {number} limit - The maximum number of async operations at a time.
+     * @param {AsyncFunction} iteratee - The async function to call `n` times.
+     * Invoked with the iteration index and a callback: (n, next).
+     * @param {Function} callback - see [async.map]{@link module:Collections.map}.
+     * @returns {Promise} a promise, if no callback is provided
+     */
+    function timesLimit(count, limit, iteratee, callback) {
+        var _iteratee = wrapAsync(iteratee);
+        return mapLimit$1(range(count), limit, _iteratee, callback);
+    }
+
+    /**
+     * Calls the `iteratee` function `n` times, and accumulates results in the same
+     * manner you would use with [map]{@link module:Collections.map}.
+     *
+     * @name times
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.map]{@link module:Collections.map}
+     * @category Control Flow
+     * @param {number} n - The number of times to run the function.
+     * @param {AsyncFunction} iteratee - The async function to call `n` times.
+     * Invoked with the iteration index and a callback: (n, next).
+     * @param {Function} callback - see {@link module:Collections.map}.
+     * @returns {Promise} a promise, if no callback is provided
+     * @example
+     *
+     * // Pretend this is some complicated async factory
+     * var createUser = function(id, callback) {
+     *     callback(null, {
+     *         id: 'user' + id
+     *     });
+     * };
+     *
+     * // generate 5 users
+     * async.times(5, function(n, next) {
+     *     createUser(n, function(err, user) {
+     *         next(err, user);
+     *     });
+     * }, function(err, users) {
+     *     // we should now have 5 users
+     * });
+     */
+    function times (n, iteratee, callback) {
+        return timesLimit(n, Infinity, iteratee, callback)
     }
-    var _task = wrapAsync(task);
-    return initialParams(function (args, callback) {
-        function taskFn(cb) {
-            _task.apply(null, args.concat(cb));
+
+    /**
+     * The same as [times]{@link module:ControlFlow.times} but runs only a single async operation at a time.
+     *
+     * @name timesSeries
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.times]{@link module:ControlFlow.times}
+     * @category Control Flow
+     * @param {number} n - The number of times to run the function.
+     * @param {AsyncFunction} iteratee - The async function to call `n` times.
+     * Invoked with the iteration index and a callback: (n, next).
+     * @param {Function} callback - see {@link module:Collections.map}.
+     * @returns {Promise} a promise, if no callback is provided
+     */
+    function timesSeries (n, iteratee, callback) {
+        return timesLimit(n, 1, iteratee, callback)
+    }
+
+    /**
+     * A relative of `reduce`.  Takes an Object or Array, and iterates over each
+     * element in parallel, each step potentially mutating an `accumulator` value.
+     * The type of the accumulator defaults to the type of collection passed in.
+     *
+     * @name transform
+     * @static
+     * @memberOf module:Collections
+     * @method
+     * @category Collection
+     * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
+     * @param {*} [accumulator] - The initial state of the transform.  If omitted,
+     * it will default to an empty Object or Array, depending on the type of `coll`
+     * @param {AsyncFunction} iteratee - A function applied to each item in the
+     * collection that potentially modifies the accumulator.
+     * Invoked with (accumulator, item, key, callback).
+     * @param {Function} [callback] - A callback which is called after all the
+     * `iteratee` functions have finished. Result is the transformed accumulator.
+     * Invoked with (err, result).
+     * @returns {Promise} a promise, if no callback provided
+     * @example
+     *
+     * async.transform([1,2,3], function(acc, item, index, callback) {
+     *     // pointless async:
+     *     process.nextTick(function() {
+     *         acc[index] = item * 2
+     *         callback(null)
+     *     });
+     * }, function(err, result) {
+     *     // result is now equal to [2, 4, 6]
+     * });
+     *
+     * @example
+     *
+     * async.transform({a: 1, b: 2, c: 3}, function (obj, val, key, callback) {
+     *     setImmediate(function () {
+     *         obj[key] = val * 2;
+     *         callback();
+     *     })
+     * }, function (err, result) {
+     *     // result is equal to {a: 2, b: 4, c: 6}
+     * })
+     */
+    function transform (coll, accumulator, iteratee, callback) {
+        if (arguments.length <= 3 && typeof accumulator === 'function') {
+            callback = iteratee;
+            iteratee = accumulator;
+            accumulator = Array.isArray(coll) ? [] : {};
         }
+        callback = once(callback || promiseCallback());
+        var _iteratee = wrapAsync(iteratee);
 
-        if (opts) retry(opts, taskFn, callback);
-        else retry(taskFn, callback);
-
-    });
-};
-
-/**
- * Run the functions in the `tasks` collection in series, each one running once
- * the previous function has completed. If any functions in the series pass an
- * error to its callback, no more functions are run, and `callback` is
- * immediately called with the value of the error. Otherwise, `callback`
- * receives an array of results when `tasks` have completed.
- *
- * It is also possible to use an object instead of an array. Each property will
- * be run as a function, and the results will be passed to the final `callback`
- * as an object instead of an array. This can be a more readable way of handling
- *  results from {@link async.series}.
- *
- * **Note** that while many implementations preserve the order of object
- * properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)
- * explicitly states that
- *
- * > The mechanics and order of enumerating the properties is not specified.
- *
- * So if you rely on the order in which your series of functions are executed,
- * and want this to work on all platforms, consider using an array.
- *
- * @name series
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Array|Iterable|Object} tasks - A collection containing
- * [async functions]{@link AsyncFunction} to run in series.
- * Each function can complete with any number of optional `result` values.
- * @param {Function} [callback] - An optional callback to run once all the
- * functions have completed. This function gets a results array (or object)
- * containing all the result arguments passed to the `task` callbacks. Invoked
- * with (err, result).
- * @example
- * async.series([
- *     function(callback) {
- *         // do some stuff ...
- *         callback(null, 'one');
- *     },
- *     function(callback) {
- *         // do some more stuff ...
- *         callback(null, 'two');
- *     }
- * ],
- * // optional callback
- * function(err, results) {
- *     // results is now equal to ['one', 'two']
- * });
- *
- * async.series({
- *     one: function(callback) {
- *         setTimeout(function() {
- *             callback(null, 1);
- *         }, 200);
- *     },
- *     two: function(callback){
- *         setTimeout(function() {
- *             callback(null, 2);
- *         }, 100);
- *     }
- * }, function(err, results) {
- *     // results is now equal to: {one: 1, two: 2}
- * });
- */
-function series(tasks, callback) {
-    _parallel(eachOfSeries, tasks, callback);
-}
-
-/**
- * Returns `true` if at least one element in the `coll` satisfies an async test.
- * If any iteratee call returns `true`, the main `callback` is immediately
- * called.
- *
- * @name some
- * @static
- * @memberOf module:Collections
- * @method
- * @alias any
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async truth test to apply to each item
- * in the collections in parallel.
- * The iteratee should complete with a boolean `result` value.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called as soon as any
- * iteratee returns `true`, or after all the iteratee functions have finished.
- * Result will be either `true` or `false` depending on the values of the async
- * tests. Invoked with (err, result).
- * @example
- *
- * async.some(['file1','file2','file3'], function(filePath, callback) {
- *     fs.access(filePath, function(err) {
- *         callback(null, !err)
- *     });
- * }, function(err, result) {
- *     // if result is true then at least one of the files exists
- * });
- */
-var some = doParallel(_createTester(Boolean, identity));
-
-/**
- * The same as [`some`]{@link module:Collections.some} but runs a maximum of `limit` async operations at a time.
- *
- * @name someLimit
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.some]{@link module:Collections.some}
- * @alias anyLimit
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - An async truth test to apply to each item
- * in the collections in parallel.
- * The iteratee should complete with a boolean `result` value.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called as soon as any
- * iteratee returns `true`, or after all the iteratee functions have finished.
- * Result will be either `true` or `false` depending on the values of the async
- * tests. Invoked with (err, result).
- */
-var someLimit = doParallelLimit(_createTester(Boolean, identity));
-
-/**
- * The same as [`some`]{@link module:Collections.some} but runs only a single async operation at a time.
- *
- * @name someSeries
- * @static
- * @memberOf module:Collections
- * @method
- * @see [async.some]{@link module:Collections.some}
- * @alias anySeries
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async truth test to apply to each item
- * in the collections in series.
- * The iteratee should complete with a boolean `result` value.
- * Invoked with (item, callback).
- * @param {Function} [callback] - A callback which is called as soon as any
- * iteratee returns `true`, or after all the iteratee functions have finished.
- * Result will be either `true` or `false` depending on the values of the async
- * tests. Invoked with (err, result).
- */
-var someSeries = doLimit(someLimit, 1);
-
-/**
- * Sorts a list by the results of running each `coll` value through an async
- * `iteratee`.
- *
- * @name sortBy
- * @static
- * @memberOf module:Collections
- * @method
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {AsyncFunction} iteratee - An async function to apply to each item in
- * `coll`.
- * The iteratee should complete with a value to use as the sort criteria as
- * its `result`.
- * Invoked with (item, callback).
- * @param {Function} callback - A callback which is called after all the
- * `iteratee` functions have finished, or an error occurs. Results is the items
- * from the original `coll` sorted by the values returned by the `iteratee`
- * calls. Invoked with (err, results).
- * @example
- *
- * async.sortBy(['file1','file2','file3'], function(file, callback) {
- *     fs.stat(file, function(err, stats) {
- *         callback(err, stats.mtime);
- *     });
- * }, function(err, results) {
- *     // results is now the original array of files sorted by
- *     // modified date
- * });
- *
- * // By modifying the callback parameter the
- * // sorting order can be influenced:
- *
- * // ascending order
- * async.sortBy([1,9,3,5], function(x, callback) {
- *     callback(null, x);
- * }, function(err,result) {
- *     // result callback
- * });
- *
- * // descending order
- * async.sortBy([1,9,3,5], function(x, callback) {
- *     callback(null, x*-1);    //<- x*-1 instead of x, turns the order around
- * }, function(err,result) {
- *     // result callback
- * });
- */
-function sortBy (coll, iteratee, callback) {
-    var _iteratee = wrapAsync(iteratee);
-    map(coll, function (x, callback) {
-        _iteratee(x, function (err, criteria) {
-            if (err) return callback(err);
-            callback(null, {value: x, criteria: criteria});
-        });
-    }, function (err, results) {
-        if (err) return callback(err);
-        callback(null, arrayMap(results.sort(comparator), baseProperty('value')));
-    });
-
-    function comparator(left, right) {
-        var a = left.criteria, b = right.criteria;
-        return a < b ? -1 : a > b ? 1 : 0;
+        eachOf$1(coll, (v, k, cb) => {
+            _iteratee(accumulator, v, k, cb);
+        }, err => callback(err, accumulator));
+        return callback[PROMISE_SYMBOL]
     }
-}
-
-/**
- * Sets a time limit on an asynchronous function. If the function does not call
- * its callback within the specified milliseconds, it will be called with a
- * timeout error. The code property for the error object will be `'ETIMEDOUT'`.
- *
- * @name timeout
- * @static
- * @memberOf module:Utils
- * @method
- * @category Util
- * @param {AsyncFunction} asyncFn - The async function to limit in time.
- * @param {number} milliseconds - The specified time limit.
- * @param {*} [info] - Any variable you want attached (`string`, `object`, etc)
- * to timeout Error for more information..
- * @returns {AsyncFunction} Returns a wrapped function that can be used with any
- * of the control flow functions.
- * Invoke this function with the same parameters as you would `asyncFunc`.
- * @example
- *
- * function myFunction(foo, callback) {
- *     doAsyncTask(foo, function(err, data) {
- *         // handle errors
- *         if (err) return callback(err);
- *
- *         // do some stuff ...
- *
- *         // return processed data
- *         return callback(null, data);
- *     });
- * }
- *
- * var wrapped = async.timeout(myFunction, 1000);
- *
- * // call `wrapped` as you would `myFunction`
- * wrapped({ bar: 'bar' }, function(err, data) {
- *     // if `myFunction` takes < 1000 ms to execute, `err`
- *     // and `data` will have their expected values
- *
- *     // else `err` will be an Error with the code 'ETIMEDOUT'
- * });
- */
-function timeout(asyncFn, milliseconds, info) {
-    var fn = wrapAsync(asyncFn);
-
-    return initialParams(function (args, callback) {
-        var timedOut = false;
-        var timer;
-
-        function timeoutCallback() {
-            var name = asyncFn.name || 'anonymous';
-            var error  = new Error('Callback function "' + name + '" timed out.');
-            error.code = 'ETIMEDOUT';
-            if (info) {
-                error.info = info;
-            }
-            timedOut = true;
-            callback(error);
+
+    /**
+     * It runs each task in series but stops whenever any of the functions were
+     * successful. If one of the tasks were successful, the `callback` will be
+     * passed the result of the successful task. If all tasks fail, the callback
+     * will be passed the error and result (if any) of the final attempt.
+     *
+     * @name tryEach
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {Array|Iterable|AsyncIterable|Object} tasks - A collection containing functions to
+     * run, each function is passed a `callback(err, result)` it must call on
+     * completion with an error `err` (which can be `null`) and an optional `result`
+     * value.
+     * @param {Function} [callback] - An optional callback which is called when one
+     * of the tasks has succeeded, or all have failed. It receives the `err` and
+     * `result` arguments of the last attempt at completing the `task`. Invoked with
+     * (err, results).
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     * async.tryEach([
+     *     function getDataFromFirstWebsite(callback) {
+     *         // Try getting the data from the first website
+     *         callback(err, data);
+     *     },
+     *     function getDataFromSecondWebsite(callback) {
+     *         // First website failed,
+     *         // Try getting the data from the backup website
+     *         callback(err, data);
+     *     }
+     * ],
+     * // optional callback
+     * function(err, results) {
+     *     Now do something with the data.
+     * });
+     *
+     */
+    function tryEach(tasks, callback) {
+        var error = null;
+        var result;
+        return eachSeries$1(tasks, (task, taskCb) => {
+            wrapAsync(task)((err, ...args) => {
+                if (args.length < 2) {
+                    [result] = args;
+                } else {
+                    result = args;
+                }
+                error = err;
+                taskCb(err ? null : {});
+            });
+        }, () => callback(error, result));
+    }
+
+    var tryEach$1 = awaitify(tryEach);
+
+    /**
+     * Undoes a [memoize]{@link module:Utils.memoize}d function, reverting it to the original,
+     * unmemoized form. Handy for testing.
+     *
+     * @name unmemoize
+     * @static
+     * @memberOf module:Utils
+     * @method
+     * @see [async.memoize]{@link module:Utils.memoize}
+     * @category Util
+     * @param {AsyncFunction} fn - the memoized function
+     * @returns {AsyncFunction} a function that calls the original unmemoized function
+     */
+    function unmemoize(fn) {
+        return (...args) => {
+            return (fn.unmemoized || fn)(...args);
+        };
+    }
+
+    /**
+     * Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when
+     * stopped, or an error occurs.
+     *
+     * @name whilst
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {AsyncFunction} test - asynchronous truth test to perform before each
+     * execution of `iteratee`. Invoked with ().
+     * @param {AsyncFunction} iteratee - An async function which is called each time
+     * `test` passes. Invoked with (callback).
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has failed and repeated execution of `iteratee` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `iteratee`'s
+     * callback. Invoked with (err, [results]);
+     * @returns {Promise} a promise, if no callback is passed
+     * @example
+     *
+     * var count = 0;
+     * async.whilst(
+     *     function test(cb) { cb(null, count < 5;) },
+     *     function iter(callback) {
+     *         count++;
+     *         setTimeout(function() {
+     *             callback(null, count);
+     *         }, 1000);
+     *     },
+     *     function (err, n) {
+     *         // 5 seconds have passed, n = 5
+     *     }
+     * );
+     */
+    function whilst(test, iteratee, callback) {
+        callback = onlyOnce(callback);
+        var _fn = wrapAsync(iteratee);
+        var _test = wrapAsync(test);
+        var results;
+
+        function next(err, ...rest) {
+            if (err) return callback(err);
+            results = rest;
+            if (err === false) return;
+            _test(check);
         }
 
-        args.push(function () {
-            if (!timedOut) {
-                callback.apply(null, arguments);
-                clearTimeout(timer);
-            }
-        });
+        function check(err, truth) {
+            if (err) return callback(err);
+            if (err === false) return;
+            if (!truth) return callback(null, ...results);
+            _fn(next);
+        }
 
-        // setup timer and call original function
-        timer = setTimeout(timeoutCallback, milliseconds);
-        fn.apply(null, args);
-    });
-}
-
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeCeil = Math.ceil;
-var nativeMax = Math.max;
-
-/**
- * The base implementation of `_.range` and `_.rangeRight` which doesn't
- * coerce arguments.
- *
- * @private
- * @param {number} start The start of the range.
- * @param {number} end The end of the range.
- * @param {number} step The value to increment or decrement by.
- * @param {boolean} [fromRight] Specify iterating from right to left.
- * @returns {Array} Returns the range of numbers.
- */
-function baseRange(start, end, step, fromRight) {
-  var index = -1,
-      length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
-      result = Array(length);
-
-  while (length--) {
-    result[fromRight ? length : ++index] = start;
-    start += step;
-  }
-  return result;
-}
-
-/**
- * The same as [times]{@link module:ControlFlow.times} but runs a maximum of `limit` async operations at a
- * time.
- *
- * @name timesLimit
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.times]{@link module:ControlFlow.times}
- * @category Control Flow
- * @param {number} count - The number of times to run the function.
- * @param {number} limit - The maximum number of async operations at a time.
- * @param {AsyncFunction} iteratee - The async function to call `n` times.
- * Invoked with the iteration index and a callback: (n, next).
- * @param {Function} callback - see [async.map]{@link module:Collections.map}.
- */
-function timeLimit(count, limit, iteratee, callback) {
-    var _iteratee = wrapAsync(iteratee);
-    mapLimit(baseRange(0, count, 1), limit, _iteratee, callback);
-}
-
-/**
- * Calls the `iteratee` function `n` times, and accumulates results in the same
- * manner you would use with [map]{@link module:Collections.map}.
- *
- * @name times
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.map]{@link module:Collections.map}
- * @category Control Flow
- * @param {number} n - The number of times to run the function.
- * @param {AsyncFunction} iteratee - The async function to call `n` times.
- * Invoked with the iteration index and a callback: (n, next).
- * @param {Function} callback - see {@link module:Collections.map}.
- * @example
- *
- * // Pretend this is some complicated async factory
- * var createUser = function(id, callback) {
- *     callback(null, {
- *         id: 'user' + id
- *     });
- * };
- *
- * // generate 5 users
- * async.times(5, function(n, next) {
- *     createUser(n, function(err, user) {
- *         next(err, user);
- *     });
- * }, function(err, users) {
- *     // we should now have 5 users
- * });
- */
-var times = doLimit(timeLimit, Infinity);
-
-/**
- * The same as [times]{@link module:ControlFlow.times} but runs only a single async operation at a time.
- *
- * @name timesSeries
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.times]{@link module:ControlFlow.times}
- * @category Control Flow
- * @param {number} n - The number of times to run the function.
- * @param {AsyncFunction} iteratee - The async function to call `n` times.
- * Invoked with the iteration index and a callback: (n, next).
- * @param {Function} callback - see {@link module:Collections.map}.
- */
-var timesSeries = doLimit(timeLimit, 1);
-
-/**
- * A relative of `reduce`.  Takes an Object or Array, and iterates over each
- * element in series, each step potentially mutating an `accumulator` value.
- * The type of the accumulator defaults to the type of collection passed in.
- *
- * @name transform
- * @static
- * @memberOf module:Collections
- * @method
- * @category Collection
- * @param {Array|Iterable|Object} coll - A collection to iterate over.
- * @param {*} [accumulator] - The initial state of the transform.  If omitted,
- * it will default to an empty Object or Array, depending on the type of `coll`
- * @param {AsyncFunction} iteratee - A function applied to each item in the
- * collection that potentially modifies the accumulator.
- * Invoked with (accumulator, item, key, callback).
- * @param {Function} [callback] - A callback which is called after all the
- * `iteratee` functions have finished. Result is the transformed accumulator.
- * Invoked with (err, result).
- * @example
- *
- * async.transform([1,2,3], function(acc, item, index, callback) {
- *     // pointless async:
- *     process.nextTick(function() {
- *         acc.push(item * 2)
- *         callback(null)
- *     });
- * }, function(err, result) {
- *     // result is now equal to [2, 4, 6]
- * });
- *
- * @example
- *
- * async.transform({a: 1, b: 2, c: 3}, function (obj, val, key, callback) {
- *     setImmediate(function () {
- *         obj[key] = val * 2;
- *         callback();
- *     })
- * }, function (err, result) {
- *     // result is equal to {a: 2, b: 4, c: 6}
- * })
- */
-function transform (coll, accumulator, iteratee, callback) {
-    if (arguments.length <= 3) {
-        callback = iteratee;
-        iteratee = accumulator;
-        accumulator = isArray(coll) ? [] : {};
+        return _test(check);
     }
-    callback = once(callback || noop);
-    var _iteratee = wrapAsync(iteratee);
-
-    eachOf(coll, function(v, k, cb) {
-        _iteratee(accumulator, v, k, cb);
-    }, function(err) {
-        callback(err, accumulator);
-    });
-}
-
-/**
- * It runs each task in series but stops whenever any of the functions were
- * successful. If one of the tasks were successful, the `callback` will be
- * passed the result of the successful task. If all tasks fail, the callback
- * will be passed the error and result (if any) of the final attempt.
- *
- * @name tryEach
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Array|Iterable|Object} tasks - A collection containing functions to
- * run, each function is passed a `callback(err, result)` it must call on
- * completion with an error `err` (which can be `null`) and an optional `result`
- * value.
- * @param {Function} [callback] - An optional callback which is called when one
- * of the tasks has succeeded, or all have failed. It receives the `err` and
- * `result` arguments of the last attempt at completing the `task`. Invoked with
- * (err, results).
- * @example
- * async.tryEach([
- *     function getDataFromFirstWebsite(callback) {
- *         // Try getting the data from the first website
- *         callback(err, data);
- *     },
- *     function getDataFromSecondWebsite(callback) {
- *         // First website failed,
- *         // Try getting the data from the backup website
- *         callback(err, data);
- *     }
- * ],
- * // optional callback
- * function(err, results) {
- *     Now do something with the data.
- * });
- *
- */
-function tryEach(tasks, callback) {
-    var error = null;
-    var result;
-    callback = callback || noop;
-    eachSeries(tasks, function(task, callback) {
-        wrapAsync(task)(function (err, res/*, ...args*/) {
-            if (arguments.length > 2) {
-                result = slice(arguments, 1);
-            } else {
-                result = res;
-            }
-            error = err;
-            callback(!err);
-        });
-    }, function () {
-        callback(error, result);
-    });
-}
-
-/**
- * Undoes a [memoize]{@link module:Utils.memoize}d function, reverting it to the original,
- * unmemoized form. Handy for testing.
- *
- * @name unmemoize
- * @static
- * @memberOf module:Utils
- * @method
- * @see [async.memoize]{@link module:Utils.memoize}
- * @category Util
- * @param {AsyncFunction} fn - the memoized function
- * @returns {AsyncFunction} a function that calls the original unmemoized function
- */
-function unmemoize(fn) {
-    return function () {
-        return (fn.unmemoized || fn).apply(null, arguments);
-    };
-}
-
-/**
- * Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when
- * stopped, or an error occurs.
- *
- * @name whilst
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Function} test - synchronous truth test to perform before each
- * execution of `iteratee`. Invoked with ().
- * @param {AsyncFunction} iteratee - An async function which is called each time
- * `test` passes. Invoked with (callback).
- * @param {Function} [callback] - A callback which is called after the test
- * function has failed and repeated execution of `iteratee` has stopped. `callback`
- * will be passed an error and any arguments passed to the final `iteratee`'s
- * callback. Invoked with (err, [results]);
- * @returns undefined
- * @example
- *
- * var count = 0;
- * async.whilst(
- *     function() { return count < 5; },
- *     function(callback) {
- *         count++;
- *         setTimeout(function() {
- *             callback(null, count);
- *         }, 1000);
- *     },
- *     function (err, n) {
- *         // 5 seconds have passed, n = 5
- *     }
- * );
- */
-function whilst(test, iteratee, callback) {
-    callback = onlyOnce(callback || noop);
-    var _iteratee = wrapAsync(iteratee);
-    if (!test()) return callback(null);
-    var next = function(err/*, ...args*/) {
-        if (err) return callback(err);
-        if (test()) return _iteratee(next);
-        var args = slice(arguments, 1);
-        callback.apply(null, [null].concat(args));
-    };
-    _iteratee(next);
-}
-
-/**
- * Repeatedly call `iteratee` until `test` returns `true`. Calls `callback` when
- * stopped, or an error occurs. `callback` will be passed an error and any
- * arguments passed to the final `iteratee`'s callback.
- *
- * The inverse of [whilst]{@link module:ControlFlow.whilst}.
- *
- * @name until
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @see [async.whilst]{@link module:ControlFlow.whilst}
- * @category Control Flow
- * @param {Function} test - synchronous truth test to perform before each
- * execution of `iteratee`. Invoked with ().
- * @param {AsyncFunction} iteratee - An async function which is called each time
- * `test` fails. Invoked with (callback).
- * @param {Function} [callback] - A callback which is called after the test
- * function has passed and repeated execution of `iteratee` has stopped. `callback`
- * will be passed an error and any arguments passed to the final `iteratee`'s
- * callback. Invoked with (err, [results]);
- */
-function until(test, iteratee, callback) {
-    whilst(function() {
-        return !test.apply(this, arguments);
-    }, iteratee, callback);
-}
-
-/**
- * Runs the `tasks` array of functions in series, each passing their results to
- * the next in the array. However, if any of the `tasks` pass an error to their
- * own callback, the next function is not executed, and the main `callback` is
- * immediately called with the error.
- *
- * @name waterfall
- * @static
- * @memberOf module:ControlFlow
- * @method
- * @category Control Flow
- * @param {Array} tasks - An array of [async functions]{@link AsyncFunction}
- * to run.
- * Each function should complete with any number of `result` values.
- * The `result` values will be passed as arguments, in order, to the next task.
- * @param {Function} [callback] - An optional callback to run once all the
- * functions have completed. This will be passed the results of the last task's
- * callback. Invoked with (err, [results]).
- * @returns undefined
- * @example
- *
- * async.waterfall([
- *     function(callback) {
- *         callback(null, 'one', 'two');
- *     },
- *     function(arg1, arg2, callback) {
- *         // arg1 now equals 'one' and arg2 now equals 'two'
- *         callback(null, 'three');
- *     },
- *     function(arg1, callback) {
- *         // arg1 now equals 'three'
- *         callback(null, 'done');
- *     }
- * ], function (err, result) {
- *     // result now equals 'done'
- * });
- *
- * // Or, with named functions:
- * async.waterfall([
- *     myFirstFunction,
- *     mySecondFunction,
- *     myLastFunction,
- * ], function (err, result) {
- *     // result now equals 'done'
- * });
- * function myFirstFunction(callback) {
- *     callback(null, 'one', 'two');
- * }
- * function mySecondFunction(arg1, arg2, callback) {
- *     // arg1 now equals 'one' and arg2 now equals 'two'
- *     callback(null, 'three');
- * }
- * function myLastFunction(arg1, callback) {
- *     // arg1 now equals 'three'
- *     callback(null, 'done');
- * }
- */
-var waterfall = function(tasks, callback) {
-    callback = once(callback || noop);
-    if (!isArray(tasks)) return callback(new Error('First argument to waterfall must be an array of functions'));
-    if (!tasks.length) return callback();
-    var taskIndex = 0;
-
-    function nextTask(args) {
-        var task = wrapAsync(tasks[taskIndex++]);
-        args.push(onlyOnce(next));
-        task.apply(null, args);
+    var whilst$1 = awaitify(whilst, 3);
+
+    /**
+     * Repeatedly call `iteratee` until `test` returns `true`. Calls `callback` when
+     * stopped, or an error occurs. `callback` will be passed an error and any
+     * arguments passed to the final `iteratee`'s callback.
+     *
+     * The inverse of [whilst]{@link module:ControlFlow.whilst}.
+     *
+     * @name until
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @see [async.whilst]{@link module:ControlFlow.whilst}
+     * @category Control Flow
+     * @param {AsyncFunction} test - asynchronous truth test to perform before each
+     * execution of `iteratee`. Invoked with (callback).
+     * @param {AsyncFunction} iteratee - An async function which is called each time
+     * `test` fails. Invoked with (callback).
+     * @param {Function} [callback] - A callback which is called after the test
+     * function has passed and repeated execution of `iteratee` has stopped. `callback`
+     * will be passed an error and any arguments passed to the final `iteratee`'s
+     * callback. Invoked with (err, [results]);
+     * @returns {Promise} a promise, if a callback is not passed
+     *
+     * @example
+     * const results = []
+     * async.until(function iter(next) {
+     *     fetchPage(url, (err, body) => {
+     *         if (err) return next(err)
+     *         results = results.concat(body.objects)
+     *         next(err, body)
+     *     })
+     * }, function test(page, cb) {
+     *     cb(null, page.next == null)
+     * }, function done (err) {
+     *     // all pages have been fetched
+     * })
+     */
+    function until(test, iteratee, callback) {
+        const _test = wrapAsync(test);
+        return whilst$1((cb) => _test((err, truth) => cb (err, !truth)), iteratee, callback);
     }
 
-    function next(err/*, ...args*/) {
-        if (err || taskIndex === tasks.length) {
-            return callback.apply(null, arguments);
+    /**
+     * Runs the `tasks` array of functions in series, each passing their results to
+     * the next in the array. However, if any of the `tasks` pass an error to their
+     * own callback, the next function is not executed, and the main `callback` is
+     * immediately called with the error.
+     *
+     * @name waterfall
+     * @static
+     * @memberOf module:ControlFlow
+     * @method
+     * @category Control Flow
+     * @param {Array} tasks - An array of [async functions]{@link AsyncFunction}
+     * to run.
+     * Each function should complete with any number of `result` values.
+     * The `result` values will be passed as arguments, in order, to the next task.
+     * @param {Function} [callback] - An optional callback to run once all the
+     * functions have completed. This will be passed the results of the last task's
+     * callback. Invoked with (err, [results]).
+     * @returns undefined
+     * @example
+     *
+     * async.waterfall([
+     *     function(callback) {
+     *         callback(null, 'one', 'two');
+     *     },
+     *     function(arg1, arg2, callback) {
+     *         // arg1 now equals 'one' and arg2 now equals 'two'
+     *         callback(null, 'three');
+     *     },
+     *     function(arg1, callback) {
+     *         // arg1 now equals 'three'
+     *         callback(null, 'done');
+     *     }
+     * ], function (err, result) {
+     *     // result now equals 'done'
+     * });
+     *
+     * // Or, with named functions:
+     * async.waterfall([
+     *     myFirstFunction,
+     *     mySecondFunction,
+     *     myLastFunction,
+     * ], function (err, result) {
+     *     // result now equals 'done'
+     * });
+     * function myFirstFunction(callback) {
+     *     callback(null, 'one', 'two');
+     * }
+     * function mySecondFunction(arg1, arg2, callback) {
+     *     // arg1 now equals 'one' and arg2 now equals 'two'
+     *     callback(null, 'three');
+     * }
+     * function myLastFunction(arg1, callback) {
+     *     // arg1 now equals 'three'
+     *     callback(null, 'done');
+     * }
+     */
+    function waterfall (tasks, callback) {
+        callback = once(callback);
+        if (!Array.isArray(tasks)) return callback(new Error('First argument to waterfall must be an array of functions'));
+        if (!tasks.length) return callback();
+        var taskIndex = 0;
+
+        function nextTask(args) {
+            var task = wrapAsync(tasks[taskIndex++]);
+            task(...args, onlyOnce(next));
+        }
+
+        function next(err, ...args) {
+            if (err === false) return
+            if (err || taskIndex === tasks.length) {
+                return callback(err, ...args);
+            }
+            nextTask(args);
         }
-        nextTask(slice(arguments, 1));
+
+        nextTask([]);
     }
 
-    nextTask([]);
-};
-
-/**
- * An "async function" in the context of Async is an asynchronous function with
- * a variable number of parameters, with the final parameter being a callback.
- * (`function (arg1, arg2, ..., callback) {}`)
- * The final callback is of the form `callback(err, results...)`, which must be
- * called once the function is completed.  The callback should be called with a
- * Error as its first argument to signal that an error occurred.
- * Otherwise, if no error occurred, it should be called with `null` as the first
- * argument, and any additional `result` arguments that may apply, to signal
- * successful completion.
- * The callback must be called exactly once, ideally on a later tick of the
- * JavaScript event loop.
- *
- * This type of function is also referred to as a "Node-style async function",
- * or a "continuation passing-style function" (CPS). Most of the methods of this
- * library are themselves CPS/Node-style async functions, or functions that
- * return CPS/Node-style async functions.
- *
- * Wherever we accept a Node-style async function, we also directly accept an
- * [ES2017 `async` function]{@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function}.
- * In this case, the `async` function will not be passed a final callback
- * argument, and any thrown error will be used as the `err` argument of the
- * implicit callback, and the return value will be used as the `result` value.
- * (i.e. a `rejected` of the returned Promise becomes the `err` callback
- * argument, and a `resolved` value becomes the `result`.)
- *
- * Note, due to JavaScript limitations, we can only detect native `async`
- * functions and not transpilied implementations.
- * Your environment must have `async`/`await` support for this to work.
- * (e.g. Node > v7.6, or a recent version of a modern browser).
- * If you are using `async` functions through a transpiler (e.g. Babel), you
- * must still wrap the function with [asyncify]{@link module:Utils.asyncify},
- * because the `async function` will be compiled to an ordinary function that
- * returns a promise.
- *
- * @typedef {Function} AsyncFunction
- * @static
- */
-
-/**
- * Async is a utility module which provides straight-forward, powerful functions
- * for working with asynchronous JavaScript. Although originally designed for
- * use with [Node.js](http://nodejs.org) and installable via
- * `npm install --save async`, it can also be used directly in the browser.
- * @module async
- * @see AsyncFunction
- */
-
-
-/**
- * A collection of `async` functions for manipulating collections, such as
- * arrays and objects.
- * @module Collections
- */
-
-/**
- * A collection of `async` functions for controlling the flow through a script.
- * @module ControlFlow
- */
-
-/**
- * A collection of `async` utility functions.
- * @module Utils
- */
-
-var index = {
-    apply: apply,
-    applyEach: applyEach,
-    applyEachSeries: applyEachSeries,
-    asyncify: asyncify,
-    auto: auto,
-    autoInject: autoInject,
-    cargo: cargo,
-    compose: compose,
-    concat: concat,
-    concatLimit: concatLimit,
-    concatSeries: concatSeries,
-    constant: constant,
-    detect: detect,
-    detectLimit: detectLimit,
-    detectSeries: detectSeries,
-    dir: dir,
-    doDuring: doDuring,
-    doUntil: doUntil,
-    doWhilst: doWhilst,
-    during: during,
-    each: eachLimit,
-    eachLimit: eachLimit$1,
-    eachOf: eachOf,
-    eachOfLimit: eachOfLimit,
-    eachOfSeries: eachOfSeries,
-    eachSeries: eachSeries,
-    ensureAsync: ensureAsync,
-    every: every,
-    everyLimit: everyLimit,
-    everySeries: everySeries,
-    filter: filter,
-    filterLimit: filterLimit,
-    filterSeries: filterSeries,
-    forever: forever,
-    groupBy: groupBy,
-    groupByLimit: groupByLimit,
-    groupBySeries: groupBySeries,
-    log: log,
-    map: map,
-    mapLimit: mapLimit,
-    mapSeries: mapSeries,
-    mapValues: mapValues,
-    mapValuesLimit: mapValuesLimit,
-    mapValuesSeries: mapValuesSeries,
-    memoize: memoize,
-    nextTick: nextTick,
-    parallel: parallelLimit,
-    parallelLimit: parallelLimit$1,
-    priorityQueue: priorityQueue,
-    queue: queue$1,
-    race: race,
-    reduce: reduce,
-    reduceRight: reduceRight,
-    reflect: reflect,
-    reflectAll: reflectAll,
-    reject: reject,
-    rejectLimit: rejectLimit,
-    rejectSeries: rejectSeries,
-    retry: retry,
-    retryable: retryable,
-    seq: seq,
-    series: series,
-    setImmediate: setImmediate$1,
-    some: some,
-    someLimit: someLimit,
-    someSeries: someSeries,
-    sortBy: sortBy,
-    timeout: timeout,
-    times: times,
-    timesLimit: timeLimit,
-    timesSeries: timesSeries,
-    transform: transform,
-    tryEach: tryEach,
-    unmemoize: unmemoize,
-    until: until,
-    waterfall: waterfall,
-    whilst: whilst,
-
-    // aliases
-    all: every,
-    allLimit: everyLimit,
-    allSeries: everySeries,
-    any: some,
-    anyLimit: someLimit,
-    anySeries: someSeries,
-    find: detect,
-    findLimit: detectLimit,
-    findSeries: detectSeries,
-    forEach: eachLimit,
-    forEachSeries: eachSeries,
-    forEachLimit: eachLimit$1,
-    forEachOf: eachOf,
-    forEachOfSeries: eachOfSeries,
-    forEachOfLimit: eachOfLimit,
-    inject: reduce,
-    foldl: reduce,
-    foldr: reduceRight,
-    select: filter,
-    selectLimit: filterLimit,
-    selectSeries: filterSeries,
-    wrapSync: asyncify
-};
-
-exports['default'] = index;
-exports.apply = apply;
-exports.applyEach = applyEach;
-exports.applyEachSeries = applyEachSeries;
-exports.asyncify = asyncify;
-exports.auto = auto;
-exports.autoInject = autoInject;
-exports.cargo = cargo;
-exports.compose = compose;
-exports.concat = concat;
-exports.concatLimit = concatLimit;
-exports.concatSeries = concatSeries;
-exports.constant = constant;
-exports.detect = detect;
-exports.detectLimit = detectLimit;
-exports.detectSeries = detectSeries;
-exports.dir = dir;
-exports.doDuring = doDuring;
-exports.doUntil = doUntil;
-exports.doWhilst = doWhilst;
-exports.during = during;
-exports.each = eachLimit;
-exports.eachLimit = eachLimit$1;
-exports.eachOf = eachOf;
-exports.eachOfLimit = eachOfLimit;
-exports.eachOfSeries = eachOfSeries;
-exports.eachSeries = eachSeries;
-exports.ensureAsync = ensureAsync;
-exports.every = every;
-exports.everyLimit = everyLimit;
-exports.everySeries = everySeries;
-exports.filter = filter;
-exports.filterLimit = filterLimit;
-exports.filterSeries = filterSeries;
-exports.forever = forever;
-exports.groupBy = groupBy;
-exports.groupByLimit = groupByLimit;
-exports.groupBySeries = groupBySeries;
-exports.log = log;
-exports.map = map;
-exports.mapLimit = mapLimit;
-exports.mapSeries = mapSeries;
-exports.mapValues = mapValues;
-exports.mapValuesLimit = mapValuesLimit;
-exports.mapValuesSeries = mapValuesSeries;
-exports.memoize = memoize;
-exports.nextTick = nextTick;
-exports.parallel = parallelLimit;
-exports.parallelLimit = parallelLimit$1;
-exports.priorityQueue = priorityQueue;
-exports.queue = queue$1;
-exports.race = race;
-exports.reduce = reduce;
-exports.reduceRight = reduceRight;
-exports.reflect = reflect;
-exports.reflectAll = reflectAll;
-exports.reject = reject;
-exports.rejectLimit = rejectLimit;
-exports.rejectSeries = rejectSeries;
-exports.retry = retry;
-exports.retryable = retryable;
-exports.seq = seq;
-exports.series = series;
-exports.setImmediate = setImmediate$1;
-exports.some = some;
-exports.someLimit = someLimit;
-exports.someSeries = someSeries;
-exports.sortBy = sortBy;
-exports.timeout = timeout;
-exports.times = times;
-exports.timesLimit = timeLimit;
-exports.timesSeries = timesSeries;
-exports.transform = transform;
-exports.tryEach = tryEach;
-exports.unmemoize = unmemoize;
-exports.until = until;
-exports.waterfall = waterfall;
-exports.whilst = whilst;
-exports.all = every;
-exports.allLimit = everyLimit;
-exports.allSeries = everySeries;
-exports.any = some;
-exports.anyLimit = someLimit;
-exports.anySeries = someSeries;
-exports.find = detect;
-exports.findLimit = detectLimit;
-exports.findSeries = detectSeries;
-exports.forEach = eachLimit;
-exports.forEachSeries = eachSeries;
-exports.forEachLimit = eachLimit$1;
-exports.forEachOf = eachOf;
-exports.forEachOfSeries = eachOfSeries;
-exports.forEachOfLimit = eachOfLimit;
-exports.inject = reduce;
-exports.foldl = reduce;
-exports.foldr = reduceRight;
-exports.select = filter;
-exports.selectLimit = filterLimit;
-exports.selectSeries = filterSeries;
-exports.wrapSync = asyncify;
-
-Object.defineProperty(exports, '__esModule', { value: true });
+    var waterfall$1 = awaitify(waterfall);
+
+    /**
+     * An "async function" in the context of Async is an asynchronous function with
+     * a variable number of parameters, with the final parameter being a callback.
+     * (`function (arg1, arg2, ..., callback) {}`)
+     * The final callback is of the form `callback(err, results...)`, which must be
+     * called once the function is completed.  The callback should be called with a
+     * Error as its first argument to signal that an error occurred.
+     * Otherwise, if no error occurred, it should be called with `null` as the first
+     * argument, and any additional `result` arguments that may apply, to signal
+     * successful completion.
+     * The callback must be called exactly once, ideally on a later tick of the
+     * JavaScript event loop.
+     *
+     * This type of function is also referred to as a "Node-style async function",
+     * or a "continuation passing-style function" (CPS). Most of the methods of this
+     * library are themselves CPS/Node-style async functions, or functions that
+     * return CPS/Node-style async functions.
+     *
+     * Wherever we accept a Node-style async function, we also directly accept an
+     * [ES2017 `async` function]{@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function}.
+     * In this case, the `async` function will not be passed a final callback
+     * argument, and any thrown error will be used as the `err` argument of the
+     * implicit callback, and the return value will be used as the `result` value.
+     * (i.e. a `rejected` of the returned Promise becomes the `err` callback
+     * argument, and a `resolved` value becomes the `result`.)
+     *
+     * Note, due to JavaScript limitations, we can only detect native `async`
+     * functions and not transpilied implementations.
+     * Your environment must have `async`/`await` support for this to work.
+     * (e.g. Node > v7.6, or a recent version of a modern browser).
+     * If you are using `async` functions through a transpiler (e.g. Babel), you
+     * must still wrap the function with [asyncify]{@link module:Utils.asyncify},
+     * because the `async function` will be compiled to an ordinary function that
+     * returns a promise.
+     *
+     * @typedef {Function} AsyncFunction
+     * @static
+     */
+
+    var index = {
+        apply,
+        applyEach: applyEach$1,
+        applyEachSeries,
+        asyncify,
+        auto,
+        autoInject,
+        cargo,
+        cargoQueue: cargo$1,
+        compose,
+        concat: concat$1,
+        concatLimit: concatLimit$1,
+        concatSeries: concatSeries$1,
+        constant,
+        detect: detect$1,
+        detectLimit: detectLimit$1,
+        detectSeries: detectSeries$1,
+        dir,
+        doUntil,
+        doWhilst: doWhilst$1,
+        each,
+        eachLimit: eachLimit$2,
+        eachOf: eachOf$1,
+        eachOfLimit: eachOfLimit$2,
+        eachOfSeries: eachOfSeries$1,
+        eachSeries: eachSeries$1,
+        ensureAsync,
+        every: every$1,
+        everyLimit: everyLimit$1,
+        everySeries: everySeries$1,
+        filter: filter$1,
+        filterLimit: filterLimit$1,
+        filterSeries: filterSeries$1,
+        forever: forever$1,
+        groupBy,
+        groupByLimit: groupByLimit$1,
+        groupBySeries,
+        log,
+        map: map$1,
+        mapLimit: mapLimit$1,
+        mapSeries: mapSeries$1,
+        mapValues,
+        mapValuesLimit: mapValuesLimit$1,
+        mapValuesSeries,
+        memoize,
+        nextTick,
+        parallel,
+        parallelLimit,
+        priorityQueue,
+        queue: queue$1,
+        race: race$1,
+        reduce: reduce$1,
+        reduceRight,
+        reflect,
+        reflectAll,
+        reject: reject$2,
+        rejectLimit: rejectLimit$1,
+        rejectSeries: rejectSeries$1,
+        retry,
+        retryable,
+        seq,
+        series,
+        setImmediate: setImmediate$1,
+        some: some$1,
+        someLimit: someLimit$1,
+        someSeries: someSeries$1,
+        sortBy: sortBy$1,
+        timeout,
+        times,
+        timesLimit,
+        timesSeries,
+        transform,
+        tryEach: tryEach$1,
+        unmemoize,
+        until,
+        waterfall: waterfall$1,
+        whilst: whilst$1,
+
+        // aliases
+        all: every$1,
+        allLimit: everyLimit$1,
+        allSeries: everySeries$1,
+        any: some$1,
+        anyLimit: someLimit$1,
+        anySeries: someSeries$1,
+        find: detect$1,
+        findLimit: detectLimit$1,
+        findSeries: detectSeries$1,
+        forEach: each,
+        forEachSeries: eachSeries$1,
+        forEachLimit: eachLimit$2,
+        forEachOf: eachOf$1,
+        forEachOfSeries: eachOfSeries$1,
+        forEachOfLimit: eachOfLimit$2,
+        inject: reduce$1,
+        foldl: reduce$1,
+        foldr: reduceRight,
+        select: filter$1,
+        selectLimit: filterLimit$1,
+        selectSeries: filterSeries$1,
+        wrapSync: asyncify,
+        during: whilst$1,
+        doDuring: doWhilst$1
+    };
+
+    exports.default = index;
+    exports.apply = apply;
+    exports.applyEach = applyEach$1;
+    exports.applyEachSeries = applyEachSeries;
+    exports.asyncify = asyncify;
+    exports.auto = auto;
+    exports.autoInject = autoInject;
+    exports.cargo = cargo;
+    exports.cargoQueue = cargo$1;
+    exports.compose = compose;
+    exports.concat = concat$1;
+    exports.concatLimit = concatLimit$1;
+    exports.concatSeries = concatSeries$1;
+    exports.constant = constant;
+    exports.detect = detect$1;
+    exports.detectLimit = detectLimit$1;
+    exports.detectSeries = detectSeries$1;
+    exports.dir = dir;
+    exports.doUntil = doUntil;
+    exports.doWhilst = doWhilst$1;
+    exports.each = each;
+    exports.eachLimit = eachLimit$2;
+    exports.eachOf = eachOf$1;
+    exports.eachOfLimit = eachOfLimit$2;
+    exports.eachOfSeries = eachOfSeries$1;
+    exports.eachSeries = eachSeries$1;
+    exports.ensureAsync = ensureAsync;
+    exports.every = every$1;
+    exports.everyLimit = everyLimit$1;
+    exports.everySeries = everySeries$1;
+    exports.filter = filter$1;
+    exports.filterLimit = filterLimit$1;
+    exports.filterSeries = filterSeries$1;
+    exports.forever = forever$1;
+    exports.groupBy = groupBy;
+    exports.groupByLimit = groupByLimit$1;
+    exports.groupBySeries = groupBySeries;
+    exports.log = log;
+    exports.map = map$1;
+    exports.mapLimit = mapLimit$1;
+    exports.mapSeries = mapSeries$1;
+    exports.mapValues = mapValues;
+    exports.mapValuesLimit = mapValuesLimit$1;
+    exports.mapValuesSeries = mapValuesSeries;
+    exports.memoize = memoize;
+    exports.nextTick = nextTick;
+    exports.parallel = parallel;
+    exports.parallelLimit = parallelLimit;
+    exports.priorityQueue = priorityQueue;
+    exports.queue = queue$1;
+    exports.race = race$1;
+    exports.reduce = reduce$1;
+    exports.reduceRight = reduceRight;
+    exports.reflect = reflect;
+    exports.reflectAll = reflectAll;
+    exports.reject = reject$2;
+    exports.rejectLimit = rejectLimit$1;
+    exports.rejectSeries = rejectSeries$1;
+    exports.retry = retry;
+    exports.retryable = retryable;
+    exports.seq = seq;
+    exports.series = series;
+    exports.setImmediate = setImmediate$1;
+    exports.some = some$1;
+    exports.someLimit = someLimit$1;
+    exports.someSeries = someSeries$1;
+    exports.sortBy = sortBy$1;
+    exports.timeout = timeout;
+    exports.times = times;
+    exports.timesLimit = timesLimit;
+    exports.timesSeries = timesSeries;
+    exports.transform = transform;
+    exports.tryEach = tryEach$1;
+    exports.unmemoize = unmemoize;
+    exports.until = until;
+    exports.waterfall = waterfall$1;
+    exports.whilst = whilst$1;
+    exports.all = every$1;
+    exports.allLimit = everyLimit$1;
+    exports.allSeries = everySeries$1;
+    exports.any = some$1;
+    exports.anyLimit = someLimit$1;
+    exports.anySeries = someSeries$1;
+    exports.find = detect$1;
+    exports.findLimit = detectLimit$1;
+    exports.findSeries = detectSeries$1;
+    exports.forEach = each;
+    exports.forEachSeries = eachSeries$1;
+    exports.forEachLimit = eachLimit$2;
+    exports.forEachOf = eachOf$1;
+    exports.forEachOfSeries = eachOfSeries$1;
+    exports.forEachOfLimit = eachOfLimit$2;
+    exports.inject = reduce$1;
+    exports.foldl = reduce$1;
+    exports.foldr = reduceRight;
+    exports.select = filter$1;
+    exports.selectLimit = filterLimit$1;
+    exports.selectSeries = filterSeries$1;
+    exports.wrapSync = asyncify;
+    exports.during = whilst$1;
+    exports.doDuring = doWhilst$1;
+
+    Object.defineProperty(exports, '__esModule', { value: true });
 
 })));
diff --git a/dist/async.min.js b/dist/async.min.js
index 013f194..c43b14f 100644
--- a/dist/async.min.js
+++ b/dist/async.min.js
@@ -1,2 +1 @@
-!function(n,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(n.async=n.async||{})}(this,function(n){"use strict";function t(n,t){t|=0;for(var e=Math.max(n.length-t,0),r=Array(e),u=0;u<e;u++)r[u]=n[t+u];return r}function e(n){var t=typeof n;return null!=n&&("object"==t||"function"==t)}function r(n){setTimeout(n,0)}function u(n){return function(e){var r=t(arguments,1);n(function(){e.apply(null,r)})}}function i(n){return ct(function(t,r){var u;try{u=n.apply(this,t)}catch(n){return r(n)}e(u)&&"function"==typeof u.then?u.then(function(n){o(r,null,n)},function(n){o(r,n.message?n:new Error(n))}):r(null,u)})}function o(n,t,e){try{n(t,e)}catch(n){lt(c,n)}}function c(n){throw n}function f(n){return st&&"AsyncFunction"===n[Symbol.toStringTag]}function a(n){return f(n)?i(n):n}function l(n){return function(e){var r=t(arguments,1),u=ct(function(t,r){var u=this;return 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\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 3fe9c7b..41bed66 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -560,8 +560,8 @@
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@@ -570,7 +570,7 @@
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@@ -603,7 +603,7 @@
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@@ -620,8 +620,8 @@
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@@ -651,7 +651,7 @@
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@@ -660,10 +660,10 @@
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@@ -679,11 +679,11 @@
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@@ -700,10 +700,10 @@
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@@ -749,7 +749,7 @@
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+        "sprintf-js": "~1.0.2"
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@@ -800,7 +800,7 @@
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@@ -839,9 +839,9 @@
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@@ -884,7 +884,7 @@
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@@ -960,7 +960,7 @@
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@@ -971,9 +971,9 @@
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@@ -982,11 +982,11 @@
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@@ -1069,14 +1069,14 @@
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@@ -1152,8 +1152,8 @@
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@@ -1190,9 +1190,9 @@
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@@ -1240,8 +1240,8 @@
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@@ -1250,7 +1250,7 @@
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@@ -1311,7 +1311,7 @@
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@@ -1338,9 +1338,9 @@
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-            "preserve": "0.2.0",
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@@ -1355,7 +1355,7 @@
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@@ -1364,7 +1364,7 @@
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@@ -1373,7 +1373,7 @@
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@@ -1382,7 +1382,7 @@
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@@ -1397,11 +1397,11 @@
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@@ -1410,8 +1410,8 @@
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@@ -1426,7 +1426,7 @@
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           "dev": true,
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@@ -1435,8 +1435,8 @@
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@@ -1445,7 +1445,7 @@
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@@ -1478,7 +1478,7 @@
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@@ -1493,7 +1493,7 @@
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@@ -1514,7 +1514,7 @@
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@@ -1523,7 +1523,7 @@
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@@ -1571,13 +1571,13 @@
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@@ -1586,7 +1586,7 @@
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           "dev": true,
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@@ -1595,11 +1595,11 @@
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-            "pify": "2.3.0",
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-            "strip-bom": "2.0.0"
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@@ -1608,19 +1608,19 @@
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-            "regex-cache": "0.4.4"
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-            "semver": "5.5.0",
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+            "is-builtin-module": "^1.0.0",
+            "semver": "2 || 3 || 4 || 5",
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@@ -1641,7 +1641,7 @@
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           "dev": true,
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@@ -1656,8 +1656,8 @@
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@@ -1666,10 +1666,10 @@
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+            "glob-base": "^0.3.0",
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@@ -1678,7 +1678,7 @@
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           "dev": true,
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@@ -1687,9 +1687,9 @@
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-            "pinkie-promise": "2.0.1"
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@@ -1710,7 +1710,7 @@
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@@ -1725,9 +1725,9 @@
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@@ -1750,9 +1750,9 @@
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-            "path-type": "1.1.0"
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@@ -1761,8 +1761,8 @@
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-            "read-pkg": "1.1.0"
+            "find-up": "^1.0.0",
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@@ -1771,7 +1771,7 @@
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@@ -1804,8 +1804,8 @@
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-            "spdx-license-ids": "3.0.0"
+            "spdx-expression-parse": "^3.0.0",
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@@ -1814,8 +1814,8 @@
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+            "spdx-exceptions": "^2.1.0",
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@@ -1830,7 +1830,7 @@
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@@ -1839,11 +1839,11 @@
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-            "object-assign": "4.1.1",
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-            "require-main-filename": "1.0.1"
+            "arrify": "^1.0.1",
+            "micromatch": "^2.3.11",
+            "object-assign": "^4.1.0",
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@@ -2608,7 +2608,7 @@
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+        "lodash": "^4.17.4",
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@@ -2653,7 +2653,7 @@
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@@ -2670,12 +2670,12 @@
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@@ -2740,7 +2740,7 @@
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@@ -2887,12 +2887,12 @@
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@@ -2901,9 +2901,9 @@
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-        "browserify-des": "1.0.1",
-        "evp_bytestokey": "1.0.3"
+        "browserify-aes": "^1.0.4",
+        "browserify-des": "^1.0.0",
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@@ -2912,9 +2912,9 @@
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-        "des.js": "1.0.0",
-        "inherits": "2.0.3"
+        "cipher-base": "^1.0.1",
+        "des.js": "^1.0.0",
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@@ -2923,8 +2923,8 @@
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       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "randombytes": "2.0.6"
+        "bn.js": "^4.1.0",
+        "randombytes": "^2.0.1"
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@@ -2933,13 +2933,13 @@
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-        "elliptic": "6.4.0",
-        "inherits": "2.0.3",
-        "parse-asn1": "5.1.1"
+        "bn.js": "^4.1.1",
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@@ -2948,7 +2948,7 @@
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+        "pako": "~1.0.5"
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@@ -2957,8 +2957,8 @@
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-        "ieee754": "1.1.11"
+        "base64-js": "^1.0.2",
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@@ -3064,7 +3064,7 @@
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       "dev": true,
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+        "callsites": "^0.2.0"
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@@ -3097,7 +3097,7 @@
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       "dev": true,
       "requires": {
-        "underscore-contrib": "0.3.0"
+        "underscore-contrib": "~0.3.0"
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@@ -3106,12 +3106,12 @@
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-        "pathval": "1.1.0",
-        "type-detect": "4.0.8"
+        "assertion-error": "^1.0.1",
+        "check-error": "^1.0.1",
+        "deep-eql": "^3.0.0",
+        "get-func-name": "^2.0.0",
+        "pathval": "^1.0.0",
+        "type-detect": "^4.0.0"
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@@ -3120,11 +3120,11 @@
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       "dev": true,
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-        "has-ansi": "2.0.0",
-        "strip-ansi": "3.0.1",
-        "supports-color": "2.0.0"
+        "ansi-styles": "^2.2.1",
+        "escape-string-regexp": "^1.0.2",
+        "has-ansi": "^2.0.0",
+        "strip-ansi": "^3.0.0",
+        "supports-color": "^2.0.0"
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@@ -3145,22 +3145,22 @@
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-        "lodash.reduce": "4.6.0",
-        "lodash.reject": "4.6.0",
-        "lodash.some": "4.6.0"
+        "css-select": "~1.2.0",
+        "dom-serializer": "~0.1.0",
+        "entities": "~1.1.1",
+        "htmlparser2": "^3.9.1",
+        "lodash.assignin": "^4.0.9",
+        "lodash.bind": "^4.1.4",
+        "lodash.defaults": "^4.0.1",
+        "lodash.filter": "^4.4.0",
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+        "lodash.merge": "^4.4.0",
+        "lodash.pick": "^4.2.1",
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+        "lodash.reject": "^4.4.0",
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@@ -3181,10 +3181,10 @@
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           "dev": true,
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-            "boolbase": "1.0.0",
-            "css-what": "2.1.0",
+            "boolbase": "~1.0.0",
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             "domutils": "1.5.1",
-            "nth-check": "1.0.1"
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@@ -3199,8 +3199,8 @@
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           "dev": true,
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-            "entities": "1.1.1"
+            "domelementtype": "~1.1.1",
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@@ -3223,7 +3223,7 @@
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           "dev": true,
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-            "domelementtype": "1.3.0"
+            "domelementtype": "1"
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@@ -3232,8 +3232,8 @@
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           "dev": true,
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-            "domelementtype": "1.3.0"
+            "dom-serializer": "0",
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@@ -3248,12 +3248,12 @@
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-            "inherits": "2.0.3",
-            "readable-stream": "2.3.6"
+            "domelementtype": "^1.3.0",
+            "domhandler": "^2.3.0",
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@@ -3346,7 +3346,7 @@
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           "dev": true,
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+            "boolbase": "~1.0.0"
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@@ -3361,13 +3361,13 @@
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-            "safe-buffer": "5.1.1",
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+            "core-util-is": "~1.0.0",
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@@ -3376,7 +3376,7 @@
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+            "safe-buffer": "~5.1.0"
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@@ -3414,8 +3414,8 @@
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+        "inherits": "^2.0.1",
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@@ -3453,7 +3453,7 @@
       "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
       "dev": true,
       "requires": {
-        "restore-cursor": "2.0.0"
+        "restore-cursor": "^2.0.0"
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@@ -3490,7 +3490,7 @@
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       "dev": true,
       "requires": {
-        "color-name": "1.1.3"
+        "color-name": "^1.1.1"
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@@ -3511,7 +3511,7 @@
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       "dev": true,
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-        "lodash": "4.17.10"
+        "lodash": "^4.5.0"
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@@ -3520,10 +3520,10 @@
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-        "lodash.memoize": "3.0.4",
-        "source-map": "0.5.7"
+        "convert-source-map": "~1.1.0",
+        "inline-source-map": "~0.6.0",
+        "lodash.memoize": "~3.0.3",
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@@ -3540,7 +3540,7 @@
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       "dev": true,
       "requires": {
-        "delayed-stream": "1.0.0"
+        "delayed-stream": "~1.0.0"
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@@ -3580,10 +3580,10 @@
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-        "readable-stream": "2.3.6",
-        "typedarray": "0.0.6"
+        "buffer-from": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^2.2.2",
+        "typedarray": "^0.0.6"
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@@ -3594,7 +3594,7 @@
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+        "parseurl": "~1.3.2",
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@@ -3615,7 +3615,7 @@
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       "dev": true,
       "requires": {
-        "date-now": "0.1.4"
+        "date-now": "^0.1.4"
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-        "lcov-parse": "0.0.10",
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-        "minimist": "1.2.0",
-        "request": "2.86.0"
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+        "lcov-parse": "^0.0.10",
+        "log-driver": "^1.2.5",
+        "minimist": "^1.2.0",
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@@ -3679,8 +3679,8 @@
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-        "elliptic": "6.4.0"
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@@ -3689,11 +3689,11 @@
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-        "md5.js": "1.3.4",
-        "ripemd160": "2.0.2",
-        "sha.js": "2.4.11"
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+        "inherits": "^2.0.1",
+        "md5.js": "^1.3.4",
+        "ripemd160": "^2.0.1",
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@@ -3702,12 +3702,12 @@
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-        "safe-buffer": "5.1.1",
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-        "which": "1.3.0"
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-            "yallist": "2.1.2"
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@@ -3739,7 +3739,7 @@
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@@ -3759,17 +3759,17 @@
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-        "randombytes": "2.0.6",
-        "randomfill": "1.0.4"
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@@ -3790,7 +3790,7 @@
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@@ -3827,9 +3827,9 @@
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@@ -3929,9 +3929,9 @@
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-        "escodegen": "1.9.1",
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@@ -3949,13 +3949,13 @@
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-        "rimraf": "2.6.2"
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@@ -3976,10 +3976,10 @@
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-        "subarg": "1.0.0",
-        "through2": "2.0.3"
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@@ -3988,8 +3988,8 @@
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@@ -3998,7 +3998,7 @@
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       "dev": true,
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@@ -4007,7 +4007,7 @@
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@@ -4018,9 +4018,9 @@
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-        "defined": "1.0.0",
-        "minimist": "1.2.0"
+        "acorn-node": "^1.3.0",
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@@ -4041,9 +4041,9 @@
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-        "bn.js": "4.11.8",
-        "miller-rabin": "4.0.1",
-        "randombytes": "2.0.6"
+        "bn.js": "^4.1.0",
+        "miller-rabin": "^4.0.0",
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@@ -4052,7 +4052,7 @@
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       "dev": true,
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-        "esutils": "2.0.2"
+        "esutils": "^2.0.2"
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@@ -4061,10 +4061,10 @@
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-        "ent": "2.2.0",
-        "extend": "3.0.1",
-        "void-elements": "2.0.1"
+        "custom-event": "~1.0.0",
+        "ent": "~2.2.0",
+        "extend": "^3.0.0",
+        "void-elements": "^2.0.0"
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@@ -4086,7 +4086,7 @@
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       "dev": true,
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-        "readable-stream": "2.3.6"
+        "readable-stream": "^2.0.2"
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@@ -4095,10 +4095,10 @@
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-        "inherits": "2.0.3",
-        "readable-stream": "2.3.6",
-        "stream-shift": "1.0.0"
+        "end-of-stream": "^1.0.0",
+        "inherits": "^2.0.1",
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@@ -4108,7 +4108,7 @@
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+        "jsbn": "~0.1.0"
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@@ -4123,13 +4123,13 @@
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-        "hash.js": "1.1.3",
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-        "inherits": "2.0.3",
-        "minimalistic-assert": "1.0.1",
-        "minimalistic-crypto-utils": "1.0.1"
+        "bn.js": "^4.4.0",
+        "brorand": "^1.0.1",
+        "hash.js": "^1.0.0",
+        "hmac-drbg": "^1.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
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@@ -4144,7 +4144,7 @@
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       "dev": true,
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-        "once": "1.4.0"
+        "once": "^1.4.0"
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@@ -4153,13 +4153,13 @@
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       "dev": true,
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-        "accepts": "1.3.5",
+        "accepts": "~1.3.4",
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-        "debug": "3.1.0",
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-        "uws": "9.14.0",
-        "ws": "3.3.3"
+        "debug": "~3.1.0",
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@@ -4181,14 +4181,14 @@
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-        "debug": "3.1.0",
-        "engine.io-parser": "2.1.2",
+        "debug": "~3.1.0",
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-        "ws": "3.3.3",
-        "xmlhttprequest-ssl": "1.5.5",
+        "ws": "~3.3.1",
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@@ -4210,10 +4210,10 @@
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-        "arraybuffer.slice": "0.0.7",
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         "blob": "0.0.4",
-        "has-binary2": "1.0.3"
+        "has-binary2": "~1.0.2"
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@@ -4258,7 +4258,7 @@
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       "dev": true,
       "requires": {
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+        "es6-promise": "^4.0.3"
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@@ -4288,11 +4288,11 @@
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-        "estraverse": "4.2.0",
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-        "optionator": "0.8.2",
-        "source-map": "0.6.1"
+        "esprima": "^3.1.3",
+        "estraverse": "^4.2.0",
+        "esutils": "^2.0.2",
+        "optionator": "^0.8.1",
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@@ -4317,44 +4317,44 @@
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-        "semver": "5.5.0",
-        "strip-ansi": "4.0.0",
-        "strip-json-comments": "2.0.1",
+        "ajv": "^5.3.0",
+        "babel-code-frame": "^6.22.0",
+        "chalk": "^2.1.0",
+        "concat-stream": "^1.6.0",
+        "cross-spawn": "^5.1.0",
+        "debug": "^3.1.0",
+        "doctrine": "^2.1.0",
+        "eslint-scope": "^3.7.1",
+        "eslint-visitor-keys": "^1.0.0",
+        "espree": "^3.5.4",
+        "esquery": "^1.0.0",
+        "esutils": "^2.0.2",
+        "file-entry-cache": "^2.0.0",
+        "functional-red-black-tree": "^1.0.1",
+        "glob": "^7.1.2",
+        "globals": "^11.0.1",
+        "ignore": "^3.3.3",
+        "imurmurhash": "^0.1.4",
+        "inquirer": "^3.0.6",
+        "is-resolvable": "^1.0.0",
+        "js-yaml": "^3.9.1",
+        "json-stable-stringify-without-jsonify": "^1.0.1",
+        "levn": "^0.3.0",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.2",
+        "mkdirp": "^0.5.1",
+        "natural-compare": "^1.4.0",
+        "optionator": "^0.8.2",
+        "path-is-inside": "^1.0.2",
+        "pluralize": "^7.0.0",
+        "progress": "^2.0.0",
+        "regexpp": "^1.0.1",
+        "require-uncached": "^1.0.3",
+        "semver": "^5.3.0",
+        "strip-ansi": "^4.0.0",
+        "strip-json-comments": "~2.0.1",
         "table": "4.0.2",
-        "text-table": "0.2.0"
+        "text-table": "~0.2.0"
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@@ -4369,7 +4369,7 @@
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           "dev": true,
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-            "color-convert": "1.9.0"
+            "color-convert": "^1.9.0"
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@@ -4378,9 +4378,9 @@
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-            "ansi-styles": "3.2.1",
-            "escape-string-regexp": "1.0.5",
-            "supports-color": "5.4.0"
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
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-        "hoek": "4.2.1",
-        "sntp": "2.1.0"
+        "boom": "4.x.x",
+        "cryptiles": "3.x.x",
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@@ -6000,8 +6000,8 @@
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+        "lodash": "^4.0.0",
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+        "hash.js": "^1.0.3",
+        "minimalistic-assert": "^1.0.0",
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@@ -6027,8 +6027,8 @@
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-        "os-tmpdir": "1.0.2"
+        "os-homedir": "^1.0.0",
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-        "follow-redirects": "1.5.0",
-        "requires-port": "1.0.0"
+        "eventemitter3": "^3.0.0",
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-        "request": "2.75.0",
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@@ -7180,7 +7180,7 @@
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@@ -7190,9 +7190,9 @@
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@@ -7202,10 +7202,10 @@
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-            "hoek": "2.16.3",
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+            "cryptiles": "2.x.x",
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@@ -7234,9 +7234,9 @@
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@@ -7260,27 +7260,27 @@
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@@ -7290,7 +7290,7 @@
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@@ -7340,15 +7340,15 @@
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@@ -7396,8 +7396,8 @@
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-        "brorand": "1.1.0"
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@@ -7464,7 +7464,7 @@
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@@ -7491,7 +7491,7 @@
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@@ -7584,7 +7584,7 @@
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@@ -7593,7 +7593,7 @@
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@@ -7604,21 +7604,21 @@
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-        "through2": "2.0.3",
-        "xtend": "4.0.1"
+        "JSONStream": "^1.0.3",
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@@ -7633,7 +7633,7 @@
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       "dev": true,
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@@ -7692,10 +7692,10 @@
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-        "split2": "2.2.0",
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@@ -7734,8 +7734,8 @@
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-            "smart-buffer": "1.1.15"
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@@ -7811,10 +7811,10 @@
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-        "shell-quote": "1.6.1",
-        "xtend": "3.0.0"
+        "debug": "^2.1.3",
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@@ -7840,7 +7840,7 @@
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       "dev": true,
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@@ -7855,33 +7855,33 @@
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+        "arrify": "^1.0.1",
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+        "convert-source-map": "^1.5.1",
+        "debug-log": "^1.0.1",
+        "default-require-extensions": "^1.0.0",
+        "find-cache-dir": "^0.1.1",
+        "find-up": "^2.1.0",
+        "foreground-child": "^1.5.3",
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+        "mkdirp": "^0.5.0",
+        "resolve-from": "^2.0.0",
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+        "signal-exit": "^3.0.1",
+        "spawn-wrap": "^1.4.2",
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@@ -7889,9 +7889,9 @@
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-            "longest": "1.0.1",
-            "repeat-string": "1.6.1"
+            "kind-of": "^3.0.2",
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@@ -7914,7 +7914,7 @@
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@@ -7967,9 +7967,9 @@
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-            "esutils": "2.0.2",
-            "js-tokens": "3.0.2"
+            "chalk": "^1.1.3",
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@@ -7977,14 +7977,14 @@
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-            "source-map": "0.5.7",
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+            "lodash": "^4.17.4",
+            "source-map": "^0.5.7",
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@@ -7992,7 +7992,7 @@
           "bundled": true,
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@@ -8000,8 +8000,8 @@
           "bundled": true,
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-            "core-js": "2.5.6",
-            "regenerator-runtime": "0.11.1"
+            "core-js": "^2.4.0",
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@@ -8009,11 +8009,11 @@
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-            "babylon": "6.18.0",
-            "lodash": "4.17.10"
+            "babel-runtime": "^6.26.0",
+            "babel-traverse": "^6.26.0",
+            "babel-types": "^6.26.0",
+            "babylon": "^6.18.0",
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@@ -8021,15 +8021,15 @@
           "bundled": true,
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-            "debug": "2.6.9",
-            "globals": "9.18.0",
-            "invariant": "2.2.4",
-            "lodash": "4.17.10"
+            "babel-code-frame": "^6.26.0",
+            "babel-messages": "^6.23.0",
+            "babel-runtime": "^6.26.0",
+            "babel-types": "^6.26.0",
+            "babylon": "^6.18.0",
+            "debug": "^2.6.8",
+            "globals": "^9.18.0",
+            "invariant": "^2.2.2",
+            "lodash": "^4.17.4"
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@@ -8037,10 +8037,10 @@
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-            "esutils": "2.0.2",
-            "lodash": "4.17.10",
-            "to-fast-properties": "1.0.3"
+            "babel-runtime": "^6.26.0",
+            "esutils": "^2.0.2",
+            "lodash": "^4.17.4",
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@@ -8058,13 +8058,13 @@
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-            "pascalcase": "0.1.1"
+            "cache-base": "^1.0.1",
+            "class-utils": "^0.3.5",
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+            "define-property": "^1.0.0",
+            "isobject": "^3.0.1",
+            "mixin-deep": "^1.2.0",
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@@ -8072,7 +8072,7 @@
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               "dev": true,
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+                "is-descriptor": "^1.0.0"
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@@ -8080,7 +8080,7 @@
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               "dev": true,
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+                "kind-of": "^6.0.0"
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@@ -8088,7 +8088,7 @@
               "bundled": true,
               "dev": true,
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+                "kind-of": "^6.0.0"
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@@ -8096,9 +8096,9 @@
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-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
+                "kind-of": "^6.0.2"
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@@ -8118,7 +8118,7 @@
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-            "balanced-match": "1.0.0",
+            "balanced-match": "^1.0.0",
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@@ -8127,16 +8127,16 @@
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-            "snapdragon-node": "2.1.1",
-            "split-string": "3.1.0",
-            "to-regex": "3.0.2"
+            "arr-flatten": "^1.1.0",
+            "array-unique": "^0.3.2",
+            "extend-shallow": "^2.0.1",
+            "fill-range": "^4.0.0",
+            "isobject": "^3.0.1",
+            "repeat-element": "^1.1.2",
+            "snapdragon": "^0.8.1",
+            "snapdragon-node": "^2.0.1",
+            "split-string": "^3.0.2",
+            "to-regex": "^3.0.1"
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@@ -8144,7 +8144,7 @@
               "bundled": true,
               "dev": true,
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-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
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@@ -8159,15 +8159,15 @@
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-            "to-object-path": "0.3.0",
-            "union-value": "1.0.0",
-            "unset-value": "1.0.0"
+            "collection-visit": "^1.0.0",
+            "component-emitter": "^1.2.1",
+            "get-value": "^2.0.6",
+            "has-value": "^1.0.0",
+            "isobject": "^3.0.1",
+            "set-value": "^2.0.0",
+            "to-object-path": "^0.3.0",
+            "union-value": "^1.0.0",
+            "unset-value": "^1.0.0"
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@@ -8182,9 +8182,9 @@
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           "requires": {
-            "md5-hex": "1.3.0",
-            "mkdirp": "0.5.1",
-            "write-file-atomic": "1.3.4"
+            "md5-hex": "^1.2.0",
+            "mkdirp": "^0.5.1",
+            "write-file-atomic": "^1.1.4"
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@@ -8199,8 +8199,8 @@
           "dev": true,
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           "requires": {
-            "align-text": "0.1.4",
-            "lazy-cache": "1.0.4"
+            "align-text": "^0.1.3",
+            "lazy-cache": "^1.0.3"
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@@ -8208,11 +8208,11 @@
           "bundled": true,
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-            "has-ansi": "2.0.0",
-            "strip-ansi": "3.0.1",
-            "supports-color": "2.0.0"
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
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@@ -8220,10 +8220,10 @@
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-            "define-property": "0.2.5",
-            "isobject": "3.0.1",
-            "static-extend": "0.1.2"
+            "arr-union": "^3.1.0",
+            "define-property": "^0.2.5",
+            "isobject": "^3.0.0",
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@@ -8231,7 +8231,7 @@
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@@ -8247,8 +8247,8 @@
           "dev": true,
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-            "right-align": "0.1.3",
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@@ -8270,8 +8270,8 @@
           "bundled": true,
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           "requires": {
-            "map-visit": "1.0.0",
-            "object-visit": "1.0.1"
+            "map-visit": "^1.0.0",
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@@ -8309,8 +8309,8 @@
           "bundled": true,
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-            "which": "1.3.0"
+            "lru-cache": "^4.0.1",
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@@ -8341,7 +8341,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
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+            "strip-bom": "^2.0.0"
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@@ -8349,8 +8349,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
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-            "isobject": "3.0.1"
+            "is-descriptor": "^1.0.2",
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@@ -8358,7 +8358,7 @@
               "bundled": true,
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+                "kind-of": "^6.0.0"
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@@ -8366,7 +8366,7 @@
               "bundled": true,
               "dev": true,
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+                "kind-of": "^6.0.0"
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@@ -8374,9 +8374,9 @@
               "bundled": true,
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-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
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@@ -8396,7 +8396,7 @@
           "bundled": true,
           "dev": true,
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+            "repeating": "^2.0.0"
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@@ -8404,7 +8404,7 @@
           "bundled": true,
           "dev": true,
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+            "is-arrayish": "^0.2.1"
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@@ -8422,13 +8422,13 @@
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-            "p-finally": "1.0.0",
-            "signal-exit": "3.0.2",
-            "strip-eof": "1.0.0"
+            "cross-spawn": "^5.0.1",
+            "get-stream": "^3.0.0",
+            "is-stream": "^1.1.0",
+            "npm-run-path": "^2.0.0",
+            "p-finally": "^1.0.0",
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@@ -8436,9 +8436,9 @@
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-                "shebang-command": "1.2.0",
-                "which": "1.3.0"
+                "lru-cache": "^4.0.1",
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@@ -8448,13 +8448,13 @@
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-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "debug": "^2.3.3",
+            "define-property": "^0.2.5",
+            "extend-shallow": "^2.0.1",
+            "posix-character-classes": "^0.1.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
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@@ -8462,7 +8462,7 @@
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               "dev": true,
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+                "is-descriptor": "^0.1.0"
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@@ -8470,7 +8470,7 @@
               "bundled": true,
               "dev": true,
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+                "is-extendable": "^0.1.0"
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@@ -8480,8 +8480,8 @@
           "bundled": true,
           "dev": true,
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-            "is-extendable": "1.0.1"
+            "assign-symbols": "^1.0.0",
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@@ -8489,7 +8489,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
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+                "is-plain-object": "^2.0.4"
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@@ -8499,14 +8499,14 @@
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-            "regex-not": "1.0.2",
-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "array-unique": "^0.3.2",
+            "define-property": "^1.0.0",
+            "expand-brackets": "^2.1.4",
+            "extend-shallow": "^2.0.1",
+            "fragment-cache": "^0.2.1",
+            "regex-not": "^1.0.0",
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@@ -8514,7 +8514,7 @@
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               "dev": true,
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+                "is-descriptor": "^1.0.0"
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@@ -8522,7 +8522,7 @@
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               "dev": true,
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+                "is-extendable": "^0.1.0"
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@@ -8530,7 +8530,7 @@
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+                "kind-of": "^6.0.0"
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@@ -8538,7 +8538,7 @@
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+                "kind-of": "^6.0.0"
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@@ -8546,9 +8546,9 @@
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-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
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@@ -8563,10 +8563,10 @@
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-            "is-number": "3.0.0",
-            "repeat-string": "1.6.1",
-            "to-regex-range": "2.1.1"
+            "extend-shallow": "^2.0.1",
+            "is-number": "^3.0.0",
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@@ -8574,7 +8574,7 @@
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+                "is-extendable": "^0.1.0"
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@@ -8584,9 +8584,9 @@
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-            "mkdirp": "0.5.1",
-            "pkg-dir": "1.0.0"
+            "commondir": "^1.0.1",
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@@ -8594,7 +8594,7 @@
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           "dev": true,
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-            "locate-path": "2.0.0"
+            "locate-path": "^2.0.0"
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@@ -8607,8 +8607,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "cross-spawn": "4.0.2",
-            "signal-exit": "3.0.2"
+            "cross-spawn": "^4",
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@@ -8616,7 +8616,7 @@
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           "dev": true,
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+            "map-cache": "^0.2.2"
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@@ -8644,12 +8644,12 @@
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-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
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@@ -8667,10 +8667,10 @@
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-            "optimist": "0.6.1",
-            "source-map": "0.4.4",
-            "uglify-js": "2.8.29"
+            "async": "^1.4.0",
+            "optimist": "^0.6.1",
+            "source-map": "^0.4.4",
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@@ -8678,7 +8678,7 @@
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               "dev": true,
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+                "amdefine": ">=0.0.4"
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@@ -8688,7 +8688,7 @@
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           "dev": true,
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+            "ansi-regex": "^2.0.0"
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@@ -8701,9 +8701,9 @@
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           "dev": true,
           "requires": {
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-            "has-values": "1.0.0",
-            "isobject": "3.0.1"
+            "get-value": "^2.0.6",
+            "has-values": "^1.0.0",
+            "isobject": "^3.0.0"
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@@ -8718,8 +8718,8 @@
           "bundled": true,
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           "requires": {
-            "is-number": "3.0.0",
-            "kind-of": "4.0.0"
+            "is-number": "^3.0.0",
+            "kind-of": "^4.0.0"
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@@ -8727,7 +8727,7 @@
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               "dev": true,
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+                "kind-of": "^3.0.2"
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@@ -8735,7 +8735,7 @@
                   "bundled": true,
                   "dev": true,
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+                    "is-buffer": "^1.1.5"
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@@ -8745,7 +8745,7 @@
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@@ -8765,8 +8765,8 @@
           "bundled": true,
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-            "once": "1.4.0",
-            "wrappy": "1.0.2"
+            "once": "^1.3.0",
+            "wrappy": "1"
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@@ -8779,7 +8779,7 @@
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           "dev": true,
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-            "loose-envify": "1.3.1"
+            "loose-envify": "^1.0.0"
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@@ -8792,7 +8792,7 @@
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           "dev": true,
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+            "kind-of": "^3.0.2"
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@@ -8810,7 +8810,7 @@
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           "dev": true,
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+            "builtin-modules": "^1.0.0"
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@@ -8818,7 +8818,7 @@
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           "dev": true,
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+            "kind-of": "^3.0.2"
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@@ -8826,9 +8826,9 @@
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-            "is-data-descriptor": "0.1.4",
-            "kind-of": "5.1.0"
+            "is-accessor-descriptor": "^0.1.6",
+            "is-data-descriptor": "^0.1.4",
+            "kind-of": "^5.0.0"
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@@ -8848,7 +8848,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "number-is-nan": "1.0.1"
+            "number-is-nan": "^1.0.0"
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@@ -8861,7 +8861,7 @@
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           "dev": true,
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+            "kind-of": "^3.0.2"
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@@ -8869,7 +8869,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
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+            "is-number": "^4.0.0"
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@@ -8884,7 +8884,7 @@
           "bundled": true,
           "dev": true,
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+            "isobject": "^3.0.1"
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@@ -8934,7 +8934,7 @@
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           "dev": true,
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+            "append-transform": "^0.4.0"
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@@ -8942,13 +8942,13 @@
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-            "babylon": "6.18.0",
-            "istanbul-lib-coverage": "1.2.0",
-            "semver": "5.5.0"
+            "babel-generator": "^6.18.0",
+            "babel-template": "^6.16.0",
+            "babel-traverse": "^6.18.0",
+            "babel-types": "^6.18.0",
+            "babylon": "^6.18.0",
+            "istanbul-lib-coverage": "^1.2.0",
+            "semver": "^5.3.0"
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@@ -8956,10 +8956,10 @@
           "bundled": true,
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-            "mkdirp": "0.5.1",
-            "path-parse": "1.0.5",
-            "supports-color": "3.2.3"
+            "istanbul-lib-coverage": "^1.1.2",
+            "mkdirp": "^0.5.1",
+            "path-parse": "^1.0.5",
+            "supports-color": "^3.1.2"
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@@ -8967,7 +8967,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "has-flag": "1.0.0"
+                "has-flag": "^1.0.0"
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@@ -8977,11 +8977,11 @@
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-            "mkdirp": "0.5.1",
-            "rimraf": "2.6.2",
-            "source-map": "0.5.7"
+            "debug": "^3.1.0",
+            "istanbul-lib-coverage": "^1.1.2",
+            "mkdirp": "^0.5.1",
+            "rimraf": "^2.6.1",
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@@ -8999,7 +8999,7 @@
           "bundled": true,
           "dev": true,
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-            "handlebars": "4.0.11"
+            "handlebars": "^4.0.3"
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@@ -9017,7 +9017,7 @@
           "bundled": true,
           "dev": true,
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+            "is-buffer": "^1.1.5"
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@@ -9031,7 +9031,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "invert-kv": "1.0.0"
+            "invert-kv": "^1.0.0"
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@@ -9039,11 +9039,11 @@
           "bundled": true,
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-            "parse-json": "2.2.0",
-            "pify": "2.3.0",
-            "pinkie-promise": "2.0.1",
-            "strip-bom": "2.0.0"
+            "graceful-fs": "^4.1.2",
+            "parse-json": "^2.2.0",
+            "pify": "^2.0.0",
+            "pinkie-promise": "^2.0.0",
+            "strip-bom": "^2.0.0"
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@@ -9051,8 +9051,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "p-locate": "2.0.0",
-            "path-exists": "3.0.0"
+            "p-locate": "^2.0.0",
+            "path-exists": "^3.0.0"
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@@ -9077,7 +9077,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "js-tokens": "3.0.2"
+            "js-tokens": "^3.0.0"
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@@ -9085,8 +9085,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "pseudomap": "1.0.2",
-            "yallist": "2.1.2"
+            "pseudomap": "^1.0.2",
+            "yallist": "^2.1.2"
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         "map-cache": {
@@ -9099,7 +9099,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "object-visit": "1.0.1"
+            "object-visit": "^1.0.0"
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         "md5-hex": {
@@ -9107,7 +9107,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "md5-o-matic": "0.1.1"
+            "md5-o-matic": "^0.1.1"
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         "md5-o-matic": {
@@ -9120,7 +9120,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "mimic-fn": "1.2.0"
+            "mimic-fn": "^1.0.0"
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         "merge-source-map": {
@@ -9128,7 +9128,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "source-map": "0.6.1"
+            "source-map": "^0.6.1"
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@@ -9143,19 +9143,19 @@
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-            "nanomatch": "1.2.9",
-            "object.pick": "1.3.0",
-            "regex-not": "1.0.2",
-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "arr-diff": "^4.0.0",
+            "array-unique": "^0.3.2",
+            "braces": "^2.3.1",
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "extglob": "^2.0.4",
+            "fragment-cache": "^0.2.1",
+            "kind-of": "^6.0.2",
+            "nanomatch": "^1.2.9",
+            "object.pick": "^1.3.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.2"
           },
           "dependencies": {
             "kind-of": {
@@ -9175,7 +9175,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "brace-expansion": "1.1.11"
+            "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
@@ -9188,8 +9188,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "for-in": "1.0.2",
-            "is-extendable": "1.0.1"
+            "for-in": "^1.0.2",
+            "is-extendable": "^1.0.1"
           },
           "dependencies": {
             "is-extendable": {
@@ -9197,7 +9197,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-plain-object": "2.0.4"
+                "is-plain-object": "^2.0.4"
               }
             }
           }
@@ -9220,18 +9220,18 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "arr-diff": "4.0.0",
-            "array-unique": "0.3.2",
-            "define-property": "2.0.2",
-            "extend-shallow": "3.0.2",
-            "fragment-cache": "0.2.1",
-            "is-odd": "2.0.0",
-            "is-windows": "1.0.2",
-            "kind-of": "6.0.2",
-            "object.pick": "1.3.0",
-            "regex-not": "1.0.2",
-            "snapdragon": "0.8.2",
-            "to-regex": "3.0.2"
+            "arr-diff": "^4.0.0",
+            "array-unique": "^0.3.2",
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
+            "fragment-cache": "^0.2.1",
+            "is-odd": "^2.0.0",
+            "is-windows": "^1.0.2",
+            "kind-of": "^6.0.2",
+            "object.pick": "^1.3.0",
+            "regex-not": "^1.0.0",
+            "snapdragon": "^0.8.1",
+            "to-regex": "^3.0.1"
           },
           "dependencies": {
             "arr-diff": {
@@ -9256,10 +9256,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "hosted-git-info": "2.6.0",
-            "is-builtin-module": "1.0.0",
-            "semver": "5.5.0",
-            "validate-npm-package-license": "3.0.3"
+            "hosted-git-info": "^2.1.4",
+            "is-builtin-module": "^1.0.0",
+            "semver": "2 || 3 || 4 || 5",
+            "validate-npm-package-license": "^3.0.1"
           }
         },
         "npm-run-path": {
@@ -9267,7 +9267,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "path-key": "2.0.1"
+            "path-key": "^2.0.0"
           }
         },
         "number-is-nan": {
@@ -9285,9 +9285,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "copy-descriptor": "0.1.1",
-            "define-property": "0.2.5",
-            "kind-of": "3.2.2"
+            "copy-descriptor": "^0.1.0",
+            "define-property": "^0.2.5",
+            "kind-of": "^3.0.3"
           },
           "dependencies": {
             "define-property": {
@@ -9295,7 +9295,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             }
           }
@@ -9305,7 +9305,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "isobject": "3.0.1"
+            "isobject": "^3.0.0"
           },
           "dependencies": {
             "isobject": {
@@ -9320,7 +9320,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "isobject": "3.0.1"
+            "isobject": "^3.0.1"
           },
           "dependencies": {
             "isobject": {
@@ -9335,7 +9335,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "wrappy": "1.0.2"
+            "wrappy": "1"
           }
         },
         "optimist": {
@@ -9343,8 +9343,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "minimist": "0.0.8",
-            "wordwrap": "0.0.3"
+            "minimist": "~0.0.1",
+            "wordwrap": "~0.0.2"
           }
         },
         "os-homedir": {
@@ -9357,9 +9357,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "execa": "0.7.0",
-            "lcid": "1.0.0",
-            "mem": "1.1.0"
+            "execa": "^0.7.0",
+            "lcid": "^1.0.0",
+            "mem": "^1.1.0"
           }
         },
         "p-finally": {
@@ -9372,7 +9372,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "p-try": "1.0.0"
+            "p-try": "^1.0.0"
           }
         },
         "p-locate": {
@@ -9380,7 +9380,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "p-limit": "1.2.0"
+            "p-limit": "^1.1.0"
           }
         },
         "p-try": {
@@ -9393,7 +9393,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "error-ex": "1.3.1"
+            "error-ex": "^1.2.0"
           }
         },
         "pascalcase": {
@@ -9406,7 +9406,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "pinkie-promise": "2.0.1"
+            "pinkie-promise": "^2.0.0"
           }
         },
         "path-is-absolute": {
@@ -9429,9 +9429,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "graceful-fs": "4.1.11",
-            "pify": "2.3.0",
-            "pinkie-promise": "2.0.1"
+            "graceful-fs": "^4.1.2",
+            "pify": "^2.0.0",
+            "pinkie-promise": "^2.0.0"
           }
         },
         "pify": {
@@ -9449,7 +9449,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "pinkie": "2.0.4"
+            "pinkie": "^2.0.0"
           }
         },
         "pkg-dir": {
@@ -9457,7 +9457,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "find-up": "1.1.2"
+            "find-up": "^1.0.0"
           },
           "dependencies": {
             "find-up": {
@@ -9465,8 +9465,8 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "path-exists": "2.1.0",
-                "pinkie-promise": "2.0.1"
+                "path-exists": "^2.0.0",
+                "pinkie-promise": "^2.0.0"
               }
             }
           }
@@ -9486,9 +9486,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "load-json-file": "1.1.0",
-            "normalize-package-data": "2.4.0",
-            "path-type": "1.1.0"
+            "load-json-file": "^1.0.0",
+            "normalize-package-data": "^2.3.2",
+            "path-type": "^1.0.0"
           }
         },
         "read-pkg-up": {
@@ -9496,8 +9496,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "find-up": "1.1.2",
-            "read-pkg": "1.1.0"
+            "find-up": "^1.0.0",
+            "read-pkg": "^1.0.0"
           },
           "dependencies": {
             "find-up": {
@@ -9505,8 +9505,8 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "path-exists": "2.1.0",
-                "pinkie-promise": "2.0.1"
+                "path-exists": "^2.0.0",
+                "pinkie-promise": "^2.0.0"
               }
             }
           }
@@ -9521,8 +9521,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "extend-shallow": "3.0.2",
-            "safe-regex": "1.1.0"
+            "extend-shallow": "^3.0.2",
+            "safe-regex": "^1.1.0"
           }
         },
         "repeat-element": {
@@ -9540,7 +9540,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-finite": "1.0.2"
+            "is-finite": "^1.0.0"
           }
         },
         "require-directory": {
@@ -9574,7 +9574,7 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "align-text": "0.1.4"
+            "align-text": "^0.1.1"
           }
         },
         "rimraf": {
@@ -9582,7 +9582,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "glob": "7.1.2"
+            "glob": "^7.0.5"
           }
         },
         "safe-regex": {
@@ -9590,7 +9590,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "ret": "0.1.15"
+            "ret": "~0.1.10"
           }
         },
         "semver": {
@@ -9608,10 +9608,10 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "extend-shallow": "2.0.1",
-            "is-extendable": "0.1.1",
-            "is-plain-object": "2.0.4",
-            "split-string": "3.1.0"
+            "extend-shallow": "^2.0.1",
+            "is-extendable": "^0.1.1",
+            "is-plain-object": "^2.0.3",
+            "split-string": "^3.0.1"
           },
           "dependencies": {
             "extend-shallow": {
@@ -9619,7 +9619,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             }
           }
@@ -9629,7 +9629,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "shebang-regex": "1.0.0"
+            "shebang-regex": "^1.0.0"
           }
         },
         "shebang-regex": {
@@ -9652,14 +9652,14 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "base": "0.11.2",
-            "debug": "2.6.9",
-            "define-property": "0.2.5",
-            "extend-shallow": "2.0.1",
-            "map-cache": "0.2.2",
-            "source-map": "0.5.7",
-            "source-map-resolve": "0.5.1",
-            "use": "3.1.0"
+            "base": "^0.11.1",
+            "debug": "^2.2.0",
+            "define-property": "^0.2.5",
+            "extend-shallow": "^2.0.1",
+            "map-cache": "^0.2.2",
+            "source-map": "^0.5.6",
+            "source-map-resolve": "^0.5.0",
+            "use": "^3.1.0"
           },
           "dependencies": {
             "define-property": {
@@ -9667,7 +9667,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             },
             "extend-shallow": {
@@ -9675,7 +9675,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
               }
             }
           }
@@ -9685,9 +9685,9 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "define-property": "1.0.0",
-            "isobject": "3.0.1",
-            "snapdragon-util": "3.0.1"
+            "define-property": "^1.0.0",
+            "isobject": "^3.0.0",
+            "snapdragon-util": "^3.0.1"
           },
           "dependencies": {
             "define-property": {
@@ -9695,7 +9695,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "1.0.2"
+                "is-descriptor": "^1.0.0"
               }
             },
             "is-accessor-descriptor": {
@@ -9703,7 +9703,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-data-descriptor": {
@@ -9711,7 +9711,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "kind-of": "6.0.2"
+                "kind-of": "^6.0.0"
               }
             },
             "is-descriptor": {
@@ -9719,9 +9719,9 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-accessor-descriptor": "1.0.0",
-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
+                "kind-of": "^6.0.2"
               }
             },
             "isobject": {
@@ -9741,7 +9741,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "kind-of": "3.2.2"
+            "kind-of": "^3.2.0"
           }
         },
         "source-map": {
@@ -9754,11 +9754,11 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "atob": "2.1.1",
-            "decode-uri-component": "0.2.0",
-            "resolve-url": "0.2.1",
-            "source-map-url": "0.4.0",
-            "urix": "0.1.0"
+            "atob": "^2.0.0",
+            "decode-uri-component": "^0.2.0",
+            "resolve-url": "^0.2.1",
+            "source-map-url": "^0.4.0",
+            "urix": "^0.1.0"
           }
         },
         "source-map-url": {
@@ -9771,12 +9771,12 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "foreground-child": "1.5.6",
-            "mkdirp": "0.5.1",
-            "os-homedir": "1.0.2",
-            "rimraf": "2.6.2",
-            "signal-exit": "3.0.2",
-            "which": "1.3.0"
+            "foreground-child": "^1.5.6",
+            "mkdirp": "^0.5.0",
+            "os-homedir": "^1.0.1",
+            "rimraf": "^2.6.2",
+            "signal-exit": "^3.0.2",
+            "which": "^1.3.0"
           }
         },
         "spdx-correct": {
@@ -9784,8 +9784,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-expression-parse": "3.0.0",
-            "spdx-license-ids": "3.0.0"
+            "spdx-expression-parse": "^3.0.0",
+            "spdx-license-ids": "^3.0.0"
           }
         },
         "spdx-exceptions": {
@@ -9798,8 +9798,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-exceptions": "2.1.0",
-            "spdx-license-ids": "3.0.0"
+            "spdx-exceptions": "^2.1.0",
+            "spdx-license-ids": "^3.0.0"
           }
         },
         "spdx-license-ids": {
@@ -9812,7 +9812,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "extend-shallow": "3.0.2"
+            "extend-shallow": "^3.0.0"
           }
         },
         "static-extend": {
@@ -9820,8 +9820,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "define-property": "0.2.5",
-            "object-copy": "0.1.0"
+            "define-property": "^0.2.5",
+            "object-copy": "^0.1.0"
           },
           "dependencies": {
             "define-property": {
@@ -9829,7 +9829,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "is-descriptor": "0.1.6"
+                "is-descriptor": "^0.1.0"
               }
             }
           }
@@ -9839,8 +9839,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-fullwidth-code-point": "2.0.0",
-            "strip-ansi": "4.0.0"
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
           },
           "dependencies": {
             "ansi-regex": {
@@ -9853,7 +9853,7 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "ansi-regex": "3.0.0"
+                "ansi-regex": "^3.0.0"
               }
             }
           }
@@ -9863,7 +9863,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^2.0.0"
           }
         },
         "strip-bom": {
@@ -9871,7 +9871,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-utf8": "0.2.1"
+            "is-utf8": "^0.2.0"
           }
         },
         "strip-eof": {
@@ -9889,11 +9889,11 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "arrify": "1.0.1",
-            "micromatch": "3.1.10",
-            "object-assign": "4.1.1",
-            "read-pkg-up": "1.0.1",
-            "require-main-filename": "1.0.1"
+            "arrify": "^1.0.1",
+            "micromatch": "^3.1.8",
+            "object-assign": "^4.1.0",
+            "read-pkg-up": "^1.0.1",
+            "require-main-filename": "^1.0.1"
           },
           "dependencies": {
             "arr-diff": {
@@ -9911,16 +9911,16 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "arr-flatten": "1.1.0",
-                "array-unique": "0.3.2",
-                "extend-shallow": "2.0.1",
-                "fill-range": "4.0.0",
-                "isobject": "3.0.1",
-                "repeat-element": "1.1.2",
-                "snapdragon": "0.8.2",
-                "snapdragon-node": "2.1.1",
-                "split-string": "3.1.0",
-                "to-regex": "3.0.2"
+                "arr-flatten": "^1.1.0",
+                "array-unique": "^0.3.2",
+                "extend-shallow": "^2.0.1",
+                "fill-range": "^4.0.0",
+                "isobject": "^3.0.1",
+                "repeat-element": "^1.1.2",
+                "snapdragon": "^0.8.1",
+                "snapdragon-node": "^2.0.1",
+                "split-string": "^3.0.2",
+                "to-regex": "^3.0.1"
               },
               "dependencies": {
                 "extend-shallow": {
@@ -9928,7 +9928,7 @@
                   "bundled": true,
                   "dev": true,
                   "requires": {
-                    "is-extendable": "0.1.1"
+                    "is-extendable": "^0.1.0"
                   }
                 }
               }
@@ -9938,13 +9938,13 @@
               "bundled": true,
               "dev": true,
               "requires": {
-                "debug": "2.6.9",
-                "define-property": "0.2.5",
-                "extend-shallow": "2.0.1",
-                "posix-character-classes": "0.1.1",
-                "regex-not": "1.0.2",
-                "snapdragon": "0.8.2",
-                "to-regex": "3.0.2"
+                "debug": "^2.3.3",
+                "define-property": "^0.2.5",
+                "extend-shallow": "^2.0.1",
+                "posix-character-classes": "^0.1.0",
+                "regex-not": "^1.0.0",
+                "snapdragon": "^0.8.1",
+                "to-regex": "^3.0.1"
               },
               "dependencies": {
                 "define-property": {
@@ -9952,7 +9952,7 @@
                   "bundled": true,
                   "dev": true,
                   "requires": {
-                    "is-descriptor": "0.1.6"
+                    "is-descriptor": "^0.1.0"
                   }
                 },
                 "extend-shallow": {
@@ -9960,7 +9960,7 @@
                   "bundled": true,
                   "dev": true,
                   "requires": {
-                    "is-extendable": "0.1.1"
+                    "is-extendable": "^0.1.0"
                   }
                 },
                 "is-accessor-descriptor": {
@@ -9968,7 +9968,7 @@
                   "bundled": true,
                   "dev": true,
                   "requires": {
-                    "kind-of": "3.2.2"
+                    "kind-of": "^3.0.2"
                   },
                   "dependencies": {
                     "kind-of": {
@@ -9976,7 +9976,7 @@
                       "bundled": true,
                       "dev": true,
                       "requires": {
-                        "is-buffer": "1.1.6"
+                        "is-buffer": "^1.1.5"
                       }
                     }
                   }
@@ -9986,7 +9986,7 @@
                   "bundled": true,
                   "dev": true,
                   "requires": {
-                    "kind-of": "3.2.2"
+                    "kind-of": "^3.0.2"
                   },
                   "dependencies": {
                     "kind-of": {
@@ -9994,7 +9994,7 @@
                       "bundled": true,
                       "dev": true,
                       "requires": {
-                        "is-buffer": "1.1.6"
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@@ -10004,9 +10004,9 @@
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@@ -10021,14 +10021,14 @@
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-                "regex-not": "1.0.2",
-                "snapdragon": "0.8.2",
-                "to-regex": "3.0.2"
+                "array-unique": "^0.3.2",
+                "define-property": "^1.0.0",
+                "expand-brackets": "^2.1.4",
+                "extend-shallow": "^2.0.1",
+                "fragment-cache": "^0.2.1",
+                "regex-not": "^1.0.0",
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@@ -10036,7 +10036,7 @@
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@@ -10044,7 +10044,7 @@
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@@ -10054,10 +10054,10 @@
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-                "is-number": "3.0.0",
-                "repeat-string": "1.6.1",
-                "to-regex-range": "2.1.1"
+                "extend-shallow": "^2.0.1",
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@@ -10065,7 +10065,7 @@
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@@ -10075,7 +10075,7 @@
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@@ -10083,7 +10083,7 @@
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               "dev": true,
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+                "kind-of": "^6.0.0"
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@@ -10091,9 +10091,9 @@
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-                "is-data-descriptor": "1.0.0",
-                "kind-of": "6.0.2"
+                "is-accessor-descriptor": "^1.0.0",
+                "is-data-descriptor": "^1.0.0",
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@@ -10101,7 +10101,7 @@
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+                "kind-of": "^3.0.2"
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@@ -10109,7 +10109,7 @@
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@@ -10129,19 +10129,19 @@
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-                "regex-not": "1.0.2",
-                "snapdragon": "0.8.2",
-                "to-regex": "3.0.2"
+                "arr-diff": "^4.0.0",
+                "array-unique": "^0.3.2",
+                "braces": "^2.3.1",
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+                "extglob": "^2.0.4",
+                "fragment-cache": "^0.2.1",
+                "kind-of": "^6.0.2",
+                "nanomatch": "^1.2.9",
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+                "regex-not": "^1.0.0",
+                "snapdragon": "^0.8.1",
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@@ -10156,7 +10156,7 @@
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+            "kind-of": "^3.0.2"
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@@ -10164,10 +10164,10 @@
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-            "extend-shallow": "3.0.2",
-            "regex-not": "1.0.2",
-            "safe-regex": "1.1.0"
+            "define-property": "^2.0.2",
+            "extend-shallow": "^3.0.2",
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@@ -10175,8 +10175,8 @@
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-            "repeat-string": "1.6.1"
+            "is-number": "^3.0.0",
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@@ -10184,7 +10184,7 @@
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               "dev": true,
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+                "kind-of": "^3.0.2"
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@@ -10200,9 +10200,9 @@
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-            "uglify-to-browserify": "1.0.2",
-            "yargs": "3.10.0"
+            "source-map": "~0.5.1",
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@@ -10211,9 +10211,9 @@
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-                "cliui": "2.1.0",
-                "decamelize": "1.2.0",
+                "camelcase": "^1.0.2",
+                "cliui": "^2.1.0",
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@@ -10230,10 +10230,10 @@
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-            "get-value": "2.0.6",
-            "is-extendable": "0.1.1",
-            "set-value": "0.4.3"
+            "arr-union": "^3.1.0",
+            "get-value": "^2.0.6",
+            "is-extendable": "^0.1.1",
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@@ -10241,7 +10241,7 @@
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-                "is-extendable": "0.1.1"
+                "is-extendable": "^0.1.0"
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@@ -10249,10 +10249,10 @@
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-                "is-extendable": "0.1.1",
-                "is-plain-object": "2.0.4",
-                "to-object-path": "0.3.0"
+                "extend-shallow": "^2.0.1",
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@@ -10262,8 +10262,8 @@
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-            "isobject": "3.0.1"
+            "has-value": "^0.3.1",
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@@ -10271,9 +10271,9 @@
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-                "has-values": "0.1.4",
-                "isobject": "2.1.0"
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@@ -10308,7 +10308,7 @@
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+            "kind-of": "^6.0.2"
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@@ -10323,8 +10323,8 @@
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-            "spdx-expression-parse": "3.0.0"
+            "spdx-correct": "^3.0.0",
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@@ -10332,7 +10332,7 @@
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+            "isexe": "^2.0.0"
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@@ -10356,8 +10356,8 @@
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-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1"
+            "string-width": "^1.0.1",
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@@ -10365,7 +10365,7 @@
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-                "number-is-nan": "1.0.1"
+                "number-is-nan": "^1.0.0"
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@@ -10373,9 +10373,9 @@
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-                "code-point-at": "1.1.0",
-                "is-fullwidth-code-point": "1.0.0",
-                "strip-ansi": "3.0.1"
+                "code-point-at": "^1.0.0",
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@@ -10390,9 +10390,9 @@
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-            "imurmurhash": "0.1.4",
-            "slide": "1.1.6"
+            "graceful-fs": "^4.1.11",
+            "imurmurhash": "^0.1.4",
+            "slide": "^1.1.5"
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@@ -10410,18 +10410,18 @@
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-            "which-module": "2.0.0",
-            "y18n": "3.2.1",
-            "yargs-parser": "9.0.2"
+            "cliui": "^4.0.0",
+            "decamelize": "^1.1.1",
+            "find-up": "^2.1.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^2.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1",
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@@ -10439,9 +10439,9 @@
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-                "string-width": "2.1.1",
-                "strip-ansi": "4.0.0",
-                "wrap-ansi": "2.1.0"
+                "string-width": "^2.1.1",
+                "strip-ansi": "^4.0.0",
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@@ -10449,7 +10449,7 @@
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               "dev": true,
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-                "ansi-regex": "3.0.0"
+                "ansi-regex": "^3.0.0"
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@@ -10457,7 +10457,7 @@
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-                "camelcase": "4.1.0"
+                "camelcase": "^4.1.0"
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@@ -10467,7 +10467,7 @@
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+            "camelcase": "^4.1.0"
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@@ -10583,7 +10583,7 @@
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       "dev": true,
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-        "wrappy": "1.0.2"
+        "wrappy": "1"
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@@ -10592,7 +10592,7 @@
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       "dev": true,
       "requires": {
-        "mimic-fn": "1.2.0"
+        "mimic-fn": "^1.0.0"
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@@ -10601,8 +10601,8 @@
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       "dev": true,
       "requires": {
-        "minimist": "0.0.10",
-        "wordwrap": "0.0.3"
+        "minimist": "~0.0.1",
+        "wordwrap": "~0.0.2"
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@@ -10625,12 +10625,12 @@
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-        "levn": "0.3.0",
-        "prelude-ls": "1.1.2",
-        "type-check": "0.3.2",
-        "wordwrap": "1.0.0"
+        "deep-is": "~0.1.3",
+        "fast-levenshtein": "~2.0.4",
+        "levn": "~0.3.0",
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2",
+        "wordwrap": "~1.0.0"
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@@ -10651,9 +10651,9 @@
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       "dev": true,
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-        "lcid": "1.0.0",
-        "mem": "1.1.0"
+        "execa": "^0.7.0",
+        "lcid": "^1.0.0",
+        "mem": "^1.1.0"
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@@ -10680,7 +10680,7 @@
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       "dev": true,
       "requires": {
-        "p-try": "1.0.0"
+        "p-try": "^1.0.0"
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@@ -10689,7 +10689,7 @@
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       "dev": true,
       "requires": {
-        "p-limit": "1.2.0"
+        "p-limit": "^1.1.0"
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@@ -10705,14 +10705,14 @@
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-        "pac-resolver": "3.0.0",
-        "raw-body": "2.3.3",
-        "socks-proxy-agent": "3.0.1"
+        "agent-base": "^4.2.0",
+        "debug": "^3.1.0",
+        "get-uri": "^2.0.0",
+        "http-proxy-agent": "^2.1.0",
+        "https-proxy-agent": "^2.2.1",
+        "pac-resolver": "^3.0.0",
+        "raw-body": "^2.2.0",
+        "socks-proxy-agent": "^3.0.0"
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@@ -10745,11 +10745,11 @@
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-        "degenerator": "1.0.4",
-        "ip": "1.1.5",
-        "netmask": "1.0.6",
-        "thunkify": "2.1.2"
+        "co": "^4.6.0",
+        "degenerator": "^1.0.4",
+        "ip": "^1.1.5",
+        "netmask": "^1.0.6",
+        "thunkify": "^2.1.2"
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@@ -10764,7 +10764,7 @@
       "integrity": "sha1-/t1NK/GTp3dF/nHjcdc8MwfZx1E=",
       "dev": true,
       "requires": {
-        "path-platform": "0.11.15"
+        "path-platform": "~0.11.15"
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@@ -10773,11 +10773,11 @@
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       "dev": true,
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-        "browserify-aes": "1.2.0",
-        "create-hash": "1.2.0",
-        "evp_bytestokey": "1.0.3",
-        "pbkdf2": "3.0.16"
+        "asn1.js": "^4.0.0",
+        "browserify-aes": "^1.0.0",
+        "create-hash": "^1.1.0",
+        "evp_bytestokey": "^1.0.0",
+        "pbkdf2": "^3.0.3"
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@@ -10786,7 +10786,7 @@
       "integrity": "sha1-1SCKNzjkZ2bikbouoXNoSSGouJ0=",
       "dev": true,
       "requires": {
-        "better-assert": "1.0.2"
+        "better-assert": "~1.0.0"
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@@ -10795,7 +10795,7 @@
       "integrity": "sha1-gCBKUNTbt3m/3G6+J3jZDkvOMgo=",
       "dev": true,
       "requires": {
-        "better-assert": "1.0.2"
+        "better-assert": "~1.0.0"
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@@ -10828,7 +10828,7 @@
       "integrity": "sha1-D+tsZPD8UY2adU3V77YscCJ2H0s=",
       "dev": true,
       "requires": {
-        "pinkie-promise": "2.0.1"
+        "pinkie-promise": "^2.0.0"
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@@ -10843,7 +10843,7 @@
           "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
           "dev": true,
           "requires": {
-            "pinkie": "2.0.4"
+            "pinkie": "^2.0.0"
           }
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@@ -10885,7 +10885,7 @@
       "dev": true,
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+        "inflection": "~1.3.0"
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@@ -10909,11 +10909,11 @@
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       "dev": true,
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-        "create-hmac": "1.1.7",
-        "ripemd160": "2.0.2",
-        "safe-buffer": "5.1.1",
-        "sha.js": "2.4.11"
+        "create-hash": "^1.1.2",
+        "create-hmac": "^1.1.4",
+        "ripemd160": "^2.0.1",
+        "safe-buffer": "^5.0.1",
+        "sha.js": "^2.4.8"
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@@ -10940,7 +10940,7 @@
       "integrity": "sha1-ITXW36ejWMBprJsXh3YogihFD/o=",
       "dev": true,
       "requires": {
-        "pinkie": "2.0.4"
+        "pinkie": "^2.0.0"
       }
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@@ -11004,7 +11004,7 @@
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