deps: upgrade npm to 7.5.6

PR-URL: https://github.com/nodejs/node/pull/37496
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>

1 files changed, 1553 insertions, 0 deletions

diff --git a/deps/npm/node_modules/diff/lib/index.mjs b/deps/npm/node_modules/diff/lib/index.mjs
new file mode 100644
index 0000000000..ca0e5917c4
--- /dev/null
+++ b/deps/npm/node_modules/diff/lib/index.mjs
@@ -0,0 +1,1553 @@
+function Diff() {}
+Diff.prototype = {
+  diff: function diff(oldString, newString) {
+    var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
+    var callback = options.callback;
+
+    if (typeof options === 'function') {
+      callback = options;
+      options = {};
+    }
+
+    this.options = options;
+    var self = this;
+
+    function done(value) {
+      if (callback) {
+        setTimeout(function () {
+          callback(undefined, value);
+        }, 0);
+        return true;
+      } else {
+        return value;
+      }
+    } // Allow subclasses to massage the input prior to running
+
+
+    oldString = this.castInput(oldString);
+    newString = this.castInput(newString);
+    oldString = this.removeEmpty(this.tokenize(oldString));
+    newString = this.removeEmpty(this.tokenize(newString));
+    var newLen = newString.length,
+        oldLen = oldString.length;
+    var editLength = 1;
+    var maxEditLength = newLen + oldLen;
+    var bestPath = [{
+      newPos: -1,
+      components: []
+    }]; // Seed editLength = 0, i.e. the content starts with the same values
+
+    var oldPos = this.extractCommon(bestPath[0], newString, oldString, 0);
+
+    if (bestPath[0].newPos + 1 >= newLen && oldPos + 1 >= oldLen) {
+      // Identity per the equality and tokenizer
+      return done([{
+        value: this.join(newString),
+        count: newString.length
+      }]);
+    } // Main worker method. checks all permutations of a given edit length for acceptance.
+
+
+    function execEditLength() {
+      for (var diagonalPath = -1 * editLength; diagonalPath <= editLength; diagonalPath += 2) {
+        var basePath = void 0;
+
+        var addPath = bestPath[diagonalPath - 1],
+            removePath = bestPath[diagonalPath + 1],
+            _oldPos = (removePath ? removePath.newPos : 0) - diagonalPath;
+
+        if (addPath) {
+          // No one else is going to attempt to use this value, clear it
+          bestPath[diagonalPath - 1] = undefined;
+        }
+
+        var canAdd = addPath && addPath.newPos + 1 < newLen,
+            canRemove = removePath && 0 <= _oldPos && _oldPos < oldLen;
+
+        if (!canAdd && !canRemove) {
+          // If this path is a terminal then prune
+          bestPath[diagonalPath] = undefined;
+          continue;
+        } // Select the diagonal that we want to branch from. We select the prior
+        // path whose position in the new string is the farthest from the origin
+        // and does not pass the bounds of the diff graph
+
+
+        if (!canAdd || canRemove && addPath.newPos < removePath.newPos) {
+          basePath = clonePath(removePath);
+          self.pushComponent(basePath.components, undefined, true);
+        } else {
+          basePath = addPath; // No need to clone, we've pulled it from the list
+
+          basePath.newPos++;
+          self.pushComponent(basePath.components, true, undefined);
+        }
+
+        _oldPos = self.extractCommon(basePath, newString, oldString, diagonalPath); // If we have hit the end of both strings, then we are done
+
+        if (basePath.newPos + 1 >= newLen && _oldPos + 1 >= oldLen) {
+          return done(buildValues(self, basePath.components, newString, oldString, self.useLongestToken));
+        } else {
+          // Otherwise track this path as a potential candidate and continue.
+          bestPath[diagonalPath] = basePath;
+        }
+      }
+
+      editLength++;
+    } // Performs the length of edit iteration. Is a bit fugly as this has to support the
+    // sync and async mode which is never fun. Loops over execEditLength until a value
+    // is produced.
+
+
+    if (callback) {
+      (function exec() {
+        setTimeout(function () {
+          // This should not happen, but we want to be safe.
+
+          /* istanbul ignore next */
+          if (editLength > maxEditLength) {
+            return callback();
+          }
+
+          if (!execEditLength()) {
+            exec();
+          }
+        }, 0);
+      })();
+    } else {
+      while (editLength <= maxEditLength) {
+        var ret = execEditLength();
+
+        if (ret) {
+          return ret;
+        }
+      }
+    }
+  },
+  pushComponent: function pushComponent(components, added, removed) {
+    var last = components[components.length - 1];
+
+    if (last && last.added === added && last.removed === removed) {
+      // We need to clone here as the component clone operation is just
+      // as shallow array clone
+      components[components.length - 1] = {
+        count: last.count + 1,
+        added: added,
+        removed: removed
+      };
+    } else {
+      components.push({
+        count: 1,
+        added: added,
+        removed: removed
+      });
+    }
+  },
+  extractCommon: function extractCommon(basePath, newString, oldString, diagonalPath) {
+    var newLen = newString.length,
+        oldLen = oldString.length,
+        newPos = basePath.newPos,
+        oldPos = newPos - diagonalPath,
+        commonCount = 0;
+
+    while (newPos + 1 < newLen && oldPos + 1 < oldLen && this.equals(newString[newPos + 1], oldString[oldPos + 1])) {
+      newPos++;
+      oldPos++;
+      commonCount++;
+    }
+
+    if (commonCount) {
+      basePath.components.push({
+        count: commonCount
+      });
+    }
+
+    basePath.newPos = newPos;
+    return oldPos;
+  },
+  equals: function equals(left, right) {
+    if (this.options.comparator) {
+      return this.options.comparator(left, right);
+    } else {
+      return left === right || this.options.ignoreCase && left.toLowerCase() === right.toLowerCase();
+    }
+  },
+  removeEmpty: function removeEmpty(array) {
+    var ret = [];
+
+    for (var i = 0; i < array.length; i++) {
+      if (array[i]) {
+        ret.push(array[i]);
+      }
+    }
+
+    return ret;
+  },
+  castInput: function castInput(value) {
+    return value;
+  },
+  tokenize: function tokenize(value) {
+    return value.split('');
+  },
+  join: function join(chars) {
+    return chars.join('');
+  }
+};
+
+function buildValues(diff, components, newString, oldString, useLongestToken) {
+  var componentPos = 0,
+      componentLen = components.length,
+      newPos = 0,
+      oldPos = 0;
+
+  for (; componentPos < componentLen; componentPos++) {
+    var component = components[componentPos];
+
+    if (!component.removed) {
+      if (!component.added && useLongestToken) {
+        var value = newString.slice(newPos, newPos + component.count);
+        value = value.map(function (value, i) {
+          var oldValue = oldString[oldPos + i];
+          return oldValue.length > value.length ? oldValue : value;
+        });
+        component.value = diff.join(value);
+      } else {
+        component.value = diff.join(newString.slice(newPos, newPos + component.count));
+      }
+
+      newPos += component.count; // Common case
+
+      if (!component.added) {
+        oldPos += component.count;
+      }
+    } else {
+      component.value = diff.join(oldString.slice(oldPos, oldPos + component.count));
+      oldPos += component.count; // Reverse add and remove so removes are output first to match common convention
+      // The diffing algorithm is tied to add then remove output and this is the simplest
+      // route to get the desired output with minimal overhead.
+
+      if (componentPos && components[componentPos - 1].added) {
+        var tmp = components[componentPos - 1];
+        components[componentPos - 1] = components[componentPos];
+        components[componentPos] = tmp;
+      }
+    }
+  } // Special case handle for when one terminal is ignored (i.e. whitespace).
+  // For this case we merge the terminal into the prior string and drop the change.
+  // This is only available for string mode.
+
+
+  var lastComponent = components[componentLen - 1];
+
+  if (componentLen > 1 && typeof lastComponent.value === 'string' && (lastComponent.added || lastComponent.removed) && diff.equals('', lastComponent.value)) {
+    components[componentLen - 2].value += lastComponent.value;
+    components.pop();
+  }
+
+  return components;
+}
+
+function clonePath(path) {
+  return {
+    newPos: path.newPos,
+    components: path.components.slice(0)
+  };
+}
+
+var characterDiff = new Diff();
+function diffChars(oldStr, newStr, options) {
+  return characterDiff.diff(oldStr, newStr, options);
+}
+
+function generateOptions(options, defaults) {
+  if (typeof options === 'function') {
+    defaults.callback = options;
+  } else if (options) {
+    for (var name in options) {
+      /* istanbul ignore else */
+      if (options.hasOwnProperty(name)) {
+        defaults[name] = options[name];
+      }
+    }
+  }
+
+  return defaults;
+}
+
+//
+// Ranges and exceptions:
+// Latin-1 Supplement, 0080–00FF
+//  - U+00D7  × Multiplication sign
+//  - U+00F7  ÷ Division sign
+// Latin Extended-A, 0100–017F
+// Latin Extended-B, 0180–024F
+// IPA Extensions, 0250–02AF
+// Spacing Modifier Letters, 02B0–02FF
+//  - U+02C7  ˇ &#711;  Caron
+//  - U+02D8  ˘ &#728;  Breve
+//  - U+02D9  ˙ &#729;  Dot Above
+//  - U+02DA  ˚ &#730;  Ring Above
+//  - U+02DB  ˛ &#731;  Ogonek
+//  - U+02DC  ˜ &#732;  Small Tilde
+//  - U+02DD  ˝ &#733;  Double Acute Accent
+// Latin Extended Additional, 1E00–1EFF
+
+var extendedWordChars = /^[A-Za-z\xC0-\u02C6\u02C8-\u02D7\u02DE-\u02FF\u1E00-\u1EFF]+$/;
+var reWhitespace = /\S/;
+var wordDiff = new Diff();
+
+wordDiff.equals = function (left, right) {
+  if (this.options.ignoreCase) {
+    left = left.toLowerCase();
+    right = right.toLowerCase();
+  }
+
+  return left === right || this.options.ignoreWhitespace && !reWhitespace.test(left) && !reWhitespace.test(right);
+};
+
+wordDiff.tokenize = function (value) {
+  // All whitespace symbols except newline group into one token, each newline - in separate token
+  var tokens = value.split(/([^\S\r\n]+|[()[\]{}'"\r\n]|\b)/); // Join the boundary splits that we do not consider to be boundaries. This is primarily the extended Latin character set.
+
+  for (var i = 0; i < tokens.length - 1; i++) {
+    // If we have an empty string in the next field and we have only word chars before and after, merge
+    if (!tokens[i + 1] && tokens[i + 2] && extendedWordChars.test(tokens[i]) && extendedWordChars.test(tokens[i + 2])) {
+      tokens[i] += tokens[i + 2];
+      tokens.splice(i + 1, 2);
+      i--;
+    }
+  }
+
+  return tokens;
+};
+
+function diffWords(oldStr, newStr, options) {
+  options = generateOptions(options, {
+    ignoreWhitespace: true
+  });
+  return wordDiff.diff(oldStr, newStr, options);
+}
+function diffWordsWithSpace(oldStr, newStr, options) {
+  return wordDiff.diff(oldStr, newStr, options);
+}
+
+var lineDiff = new Diff();
+
+lineDiff.tokenize = function (value) {
+  var retLines = [],
+      linesAndNewlines = value.split(/(\n|\r\n)/); // Ignore the final empty token that occurs if the string ends with a new line
+
+  if (!linesAndNewlines[linesAndNewlines.length - 1]) {
+    linesAndNewlines.pop();
+  } // Merge the content and line separators into single tokens
+
+
+  for (var i = 0; i < linesAndNewlines.length; i++) {
+    var line = linesAndNewlines[i];
+
+    if (i % 2 && !this.options.newlineIsToken) {
+      retLines[retLines.length - 1] += line;
+    } else {
+      if (this.options.ignoreWhitespace) {
+        line = line.trim();
+      }
+
+      retLines.push(line);
+    }
+  }
+
+  return retLines;
+};
+
+function diffLines(oldStr, newStr, callback) {
+  return lineDiff.diff(oldStr, newStr, callback);
+}
+function diffTrimmedLines(oldStr, newStr, callback) {
+  var options = generateOptions(callback, {
+    ignoreWhitespace: true
+  });
+  return lineDiff.diff(oldStr, newStr, options);
+}
+
+var sentenceDiff = new Diff();
+
+sentenceDiff.tokenize = function (value) {
+  return value.split(/(\S.+?[.!?])(?=\s+|$)/);
+};
+
+function diffSentences(oldStr, newStr, callback) {
+  return sentenceDiff.diff(oldStr, newStr, callback);
+}
+
+var cssDiff = new Diff();
+
+cssDiff.tokenize = function (value) {
+  return value.split(/([{}:;,]|\s+)/);
+};
+
+function diffCss(oldStr, newStr, callback) {
+  return cssDiff.diff(oldStr, newStr, callback);
+}
+
+function _typeof(obj) {
+  "@babel/helpers - typeof";
+
+  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
+    _typeof = function (obj) {
+      return typeof obj;
+    };
+  } else {
+    _typeof = function (obj) {
+      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+    };
+  }
+
+  return _typeof(obj);
+}
+
+function _toConsumableArray(arr) {
+  return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread();
+}
+
+function _arrayWithoutHoles(arr) {
+  if (Array.isArray(arr)) return _arrayLikeToArray(arr);
+}
+
+function _iterableToArray(iter) {
+  if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter);
+}
+
+function _unsupportedIterableToArray(o, minLen) {
+  if (!o) return;
+  if (typeof o === "string") return _arrayLikeToArray(o, minLen);
+  var n = Object.prototype.toString.call(o).slice(8, -1);
+  if (n === "Object" && o.constructor) n = o.constructor.name;
+  if (n === "Map" || n === "Set") return Array.from(o);
+  if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
+}
+
+function _arrayLikeToArray(arr, len) {
+  if (len == null || len > arr.length) len = arr.length;
+
+  for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
+
+  return arr2;
+}
+
+function _nonIterableSpread() {
+  throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+}
+
+var objectPrototypeToString = Object.prototype.toString;
+var jsonDiff = new Diff(); // Discriminate between two lines of pretty-printed, serialized JSON where one of them has a
+// dangling comma and the other doesn't. Turns out including the dangling comma yields the nicest output:
+
+jsonDiff.useLongestToken = true;
+jsonDiff.tokenize = lineDiff.tokenize;
+
+jsonDiff.castInput = function (value) {
+  var _this$options = this.options,
+      undefinedReplacement = _this$options.undefinedReplacement,
+      _this$options$stringi = _this$options.stringifyReplacer,
+      stringifyReplacer = _this$options$stringi === void 0 ? function (k, v) {
+    return typeof v === 'undefined' ? undefinedReplacement : v;
+  } : _this$options$stringi;
+  return typeof value === 'string' ? value : JSON.stringify(canonicalize(value, null, null, stringifyReplacer), stringifyReplacer, '  ');
+};
+
+jsonDiff.equals = function (left, right) {
+  return Diff.prototype.equals.call(jsonDiff, left.replace(/,([\r\n])/g, '$1'), right.replace(/,([\r\n])/g, '$1'));
+};
+
+function diffJson(oldObj, newObj, options) {
+  return jsonDiff.diff(oldObj, newObj, options);
+} // This function handles the presence of circular references by bailing out when encountering an
+// object that is already on the "stack" of items being processed. Accepts an optional replacer
+
+function canonicalize(obj, stack, replacementStack, replacer, key) {
+  stack = stack || [];
+  replacementStack = replacementStack || [];
+
+  if (replacer) {
+    obj = replacer(key, obj);
+  }
+
+  var i;
+
+  for (i = 0; i < stack.length; i += 1) {
+    if (stack[i] === obj) {
+      return replacementStack[i];
+    }
+  }
+
+  var canonicalizedObj;
+
+  if ('[object Array]' === objectPrototypeToString.call(obj)) {
+    stack.push(obj);
+    canonicalizedObj = new Array(obj.length);
+    replacementStack.push(canonicalizedObj);
+
+    for (i = 0; i < obj.length; i += 1) {
+      canonicalizedObj[i] = canonicalize(obj[i], stack, replacementStack, replacer, key);
+    }
+
+    stack.pop();
+    replacementStack.pop();
+    return canonicalizedObj;
+  }
+
+  if (obj && obj.toJSON) {
+    obj = obj.toJSON();
+  }
+
+  if (_typeof(obj) === 'object' && obj !== null) {
+    stack.push(obj);
+    canonicalizedObj = {};
+    replacementStack.push(canonicalizedObj);
+
+    var sortedKeys = [],
+        _key;
+
+    for (_key in obj) {
+      /* istanbul ignore else */
+      if (obj.hasOwnProperty(_key)) {
+        sortedKeys.push(_key);
+      }
+    }
+
+    sortedKeys.sort();
+
+    for (i = 0; i < sortedKeys.length; i += 1) {
+      _key = sortedKeys[i];
+      canonicalizedObj[_key] = canonicalize(obj[_key], stack, replacementStack, replacer, _key);
+    }
+
+    stack.pop();
+    replacementStack.pop();
+  } else {
+    canonicalizedObj = obj;
+  }
+
+  return canonicalizedObj;
+}
+
+var arrayDiff = new Diff();
+
+arrayDiff.tokenize = function (value) {
+  return value.slice();
+};
+
+arrayDiff.join = arrayDiff.removeEmpty = function (value) {
+  return value;
+};
+
+function diffArrays(oldArr, newArr, callback) {
+  return arrayDiff.diff(oldArr, newArr, callback);
+}
+
+function parsePatch(uniDiff) {
+  var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+  var diffstr = uniDiff.split(/\r\n|[\n\v\f\r\x85]/),
+      delimiters = uniDiff.match(/\r\n|[\n\v\f\r\x85]/g) || [],
+      list = [],
+      i = 0;
+
+  function parseIndex() {
+    var index = {};
+    list.push(index); // Parse diff metadata
+
+    while (i < diffstr.length) {
+      var line = diffstr[i]; // File header found, end parsing diff metadata
+
+      if (/^(\-\-\-|\+\+\+|@@)\s/.test(line)) {
+        break;
+      } // Diff index
+
+
+      var header = /^(?:Index:|diff(?: -r \w+)+)\s+(.+?)\s*$/.exec(line);
+
+      if (header) {
+        index.index = header[1];
+      }
+
+      i++;
+    } // Parse file headers if they are defined. Unified diff requires them, but
+    // there's no technical issues to have an isolated hunk without file header
+
+
+    parseFileHeader(index);
+    parseFileHeader(index); // Parse hunks
+
+    index.hunks = [];
+
+    while (i < diffstr.length) {
+      var _line = diffstr[i];
+
+      if (/^(Index:|diff|\-\-\-|\+\+\+)\s/.test(_line)) {
+        break;
+      } else if (/^@@/.test(_line)) {
+        index.hunks.push(parseHunk());
+      } else if (_line && options.strict) {
+        // Ignore unexpected content unless in strict mode
+        throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(_line));
+      } else {
+        i++;
+      }
+    }
+  } // Parses the --- and +++ headers, if none are found, no lines
+  // are consumed.
+
+
+  function parseFileHeader(index) {
+    var fileHeader = /^(---|\+\+\+)\s+(.*)$/.exec(diffstr[i]);
+
+    if (fileHeader) {
+      var keyPrefix = fileHeader[1] === '---' ? 'old' : 'new';
+      var data = fileHeader[2].split('\t', 2);
+      var fileName = data[0].replace(/\\\\/g, '\\');
+
+      if (/^".*"$/.test(fileName)) {
+        fileName = fileName.substr(1, fileName.length - 2);
+      }
+
+      index[keyPrefix + 'FileName'] = fileName;
+      index[keyPrefix + 'Header'] = (data[1] || '').trim();
+      i++;
+    }
+  } // Parses a hunk
+  // This assumes that we are at the start of a hunk.
+
+
+  function parseHunk() {
+    var chunkHeaderIndex = i,
+        chunkHeaderLine = diffstr[i++],
+        chunkHeader = chunkHeaderLine.split(/@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/);
+    var hunk = {
+      oldStart: +chunkHeader[1],
+      oldLines: typeof chunkHeader[2] === 'undefined' ? 1 : +chunkHeader[2],
+      newStart: +chunkHeader[3],
+      newLines: typeof chunkHeader[4] === 'undefined' ? 1 : +chunkHeader[4],
+      lines: [],
+      linedelimiters: []
+    }; // Unified Diff Format quirk: If the chunk size is 0,
+    // the first number is one lower than one would expect.
+    // https://www.artima.com/weblogs/viewpost.jsp?thread=164293
+
+    if (hunk.oldLines === 0) {
+      hunk.oldStart += 1;
+    }
+
+    if (hunk.newLines === 0) {
+      hunk.newStart += 1;
+    }
+
+    var addCount = 0,
+        removeCount = 0;
+
+    for (; i < diffstr.length; i++) {
+      // Lines starting with '---' could be mistaken for the "remove line" operation
+      // But they could be the header for the next file. Therefore prune such cases out.
+      if (diffstr[i].indexOf('--- ') === 0 && i + 2 < diffstr.length && diffstr[i + 1].indexOf('+++ ') === 0 && diffstr[i + 2].indexOf('@@') === 0) {
+        break;
+      }
+
+      var operation = diffstr[i].length == 0 && i != diffstr.length - 1 ? ' ' : diffstr[i][0];
+
+      if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\') {
+        hunk.lines.push(diffstr[i]);
+        hunk.linedelimiters.push(delimiters[i] || '\n');
+
+        if (operation === '+') {
+          addCount++;
+        } else if (operation === '-') {
+          removeCount++;
+        } else if (operation === ' ') {
+          addCount++;
+          removeCount++;
+        }
+      } else {
+        break;
+      }
+    } // Handle the empty block count case
+
+
+    if (!addCount && hunk.newLines === 1) {
+      hunk.newLines = 0;
+    }
+
+    if (!removeCount && hunk.oldLines === 1) {
+      hunk.oldLines = 0;
+    } // Perform optional sanity checking
+
+
+    if (options.strict) {
+      if (addCount !== hunk.newLines) {
+        throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
+      }
+
+      if (removeCount !== hunk.oldLines) {
+        throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
+      }
+    }
+
+    return hunk;
+  }
+
+  while (i < diffstr.length) {
+    parseIndex();
+  }
+
+  return list;
+}
+
+// Iterator that traverses in the range of [min, max], stepping
+// by distance from a given start position. I.e. for [0, 4], with
+// start of 2, this will iterate 2, 3, 1, 4, 0.
+function distanceIterator (start, minLine, maxLine) {
+  var wantForward = true,
+      backwardExhausted = false,
+      forwardExhausted = false,
+      localOffset = 1;
+  return function iterator() {
+    if (wantForward && !forwardExhausted) {
+      if (backwardExhausted) {
+        localOffset++;
+      } else {
+        wantForward = false;
+      } // Check if trying to fit beyond text length, and if not, check it fits
+      // after offset location (or desired location on first iteration)
+
+
+      if (start + localOffset <= maxLine) {
+        return localOffset;
+      }
+
+      forwardExhausted = true;
+    }
+
+    if (!backwardExhausted) {
+      if (!forwardExhausted) {
+        wantForward = true;
+      } // Check if trying to fit before text beginning, and if not, check it fits
+      // before offset location
+
+
+      if (minLine <= start - localOffset) {
+        return -localOffset++;
+      }
+
+      backwardExhausted = true;
+      return iterator();
+    } // We tried to fit hunk before text beginning and beyond text length, then
+    // hunk can't fit on the text. Return undefined
+
+  };
+}
+
+function applyPatch(source, uniDiff) {
+  var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
+
+  if (typeof uniDiff === 'string') {
+    uniDiff = parsePatch(uniDiff);
+  }
+
+  if (Array.isArray(uniDiff)) {
+    if (uniDiff.length > 1) {
+      throw new Error('applyPatch only works with a single input.');
+    }
+
+    uniDiff = uniDiff[0];
+  } // Apply the diff to the input
+
+
+  var lines = source.split(/\r\n|[\n\v\f\r\x85]/),
+      delimiters = source.match(/\r\n|[\n\v\f\r\x85]/g) || [],
+      hunks = uniDiff.hunks,
+      compareLine = options.compareLine || function (lineNumber, line, operation, patchContent) {
+    return line === patchContent;
+  },
+      errorCount = 0,
+      fuzzFactor = options.fuzzFactor || 0,
+      minLine = 0,
+      offset = 0,
+      removeEOFNL,
+      addEOFNL;
+  /**
+   * Checks if the hunk exactly fits on the provided location
+   */
+
+
+  function hunkFits(hunk, toPos) {
+    for (var j = 0; j < hunk.lines.length; j++) {
+      var line = hunk.lines[j],
+          operation = line.length > 0 ? line[0] : ' ',
+          content = line.length > 0 ? line.substr(1) : line;
+
+      if (operation === ' ' || operation === '-') {
+        // Context sanity check
+        if (!compareLine(toPos + 1, lines[toPos], operation, content)) {
+          errorCount++;
+
+          if (errorCount > fuzzFactor) {
+            return false;
+          }
+        }
+
+        toPos++;
+      }
+    }
+
+    return true;
+  } // Search best fit offsets for each hunk based on the previous ones
+
+
+  for (var i = 0; i < hunks.length; i++) {
+    var hunk = hunks[i],
+        maxLine = lines.length - hunk.oldLines,
+        localOffset = 0,
+        toPos = offset + hunk.oldStart - 1;
+    var iterator = distanceIterator(toPos, minLine, maxLine);
+
+    for (; localOffset !== undefined; localOffset = iterator()) {
+      if (hunkFits(hunk, toPos + localOffset)) {
+        hunk.offset = offset += localOffset;
+        break;
+      }
+    }
+
+    if (localOffset === undefined) {
+      return false;
+    } // Set lower text limit to end of the current hunk, so next ones don't try
+    // to fit over already patched text
+
+
+    minLine = hunk.offset + hunk.oldStart + hunk.oldLines;
+  } // Apply patch hunks
+
+
+  var diffOffset = 0;
+
+  for (var _i = 0; _i < hunks.length; _i++) {
+    var _hunk = hunks[_i],
+        _toPos = _hunk.oldStart + _hunk.offset + diffOffset - 1;
+
+    diffOffset += _hunk.newLines - _hunk.oldLines;
+
+    for (var j = 0; j < _hunk.lines.length; j++) {
+      var line = _hunk.lines[j],
+          operation = line.length > 0 ? line[0] : ' ',
+          content = line.length > 0 ? line.substr(1) : line,
+          delimiter = _hunk.linedelimiters[j];
+
+      if (operation === ' ') {
+        _toPos++;
+      } else if (operation === '-') {
+        lines.splice(_toPos, 1);
+        delimiters.splice(_toPos, 1);
+        /* istanbul ignore else */
+      } else if (operation === '+') {
+        lines.splice(_toPos, 0, content);
+        delimiters.splice(_toPos, 0, delimiter);
+        _toPos++;
+      } else if (operation === '\\') {
+        var previousOperation = _hunk.lines[j - 1] ? _hunk.lines[j - 1][0] : null;
+
+        if (previousOperation === '+') {
+          removeEOFNL = true;
+        } else if (previousOperation === '-') {
+          addEOFNL = true;
+        }
+      }
+    }
+  } // Handle EOFNL insertion/removal
+
+
+  if (removeEOFNL) {
+    while (!lines[lines.length - 1]) {
+      lines.pop();
+      delimiters.pop();
+    }
+  } else if (addEOFNL) {
+    lines.push('');
+    delimiters.push('\n');
+  }
+
+  for (var _k = 0; _k < lines.length - 1; _k++) {
+    lines[_k] = lines[_k] + delimiters[_k];
+  }
+
+  return lines.join('');
+} // Wrapper that supports multiple file patches via callbacks.
+
+function applyPatches(uniDiff, options) {
+  if (typeof uniDiff === 'string') {
+    uniDiff = parsePatch(uniDiff);
+  }
+
+  var currentIndex = 0;
+
+  function processIndex() {
+    var index = uniDiff[currentIndex++];
+
+    if (!index) {
+      return options.complete();
+    }
+
+    options.loadFile(index, function (err, data) {
+      if (err) {
+        return options.complete(err);
+      }
+
+      var updatedContent = applyPatch(data, index, options);
+      options.patched(index, updatedContent, function (err) {
+        if (err) {
+          return options.complete(err);
+        }
+
+        processIndex();
+      });
+    });
+  }
+
+  processIndex();
+}
+
+function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
+  if (!options) {
+    options = {};
+  }
+
+  if (typeof options.context === 'undefined') {
+    options.context = 4;
+  }
+
+  var diff = diffLines(oldStr, newStr, options);
+  diff.push({
+    value: '',
+    lines: []
+  }); // Append an empty value to make cleanup easier
+
+  function contextLines(lines) {
+    return lines.map(function (entry) {
+      return ' ' + entry;
+    });
+  }
+
+  var hunks = [];
+  var oldRangeStart = 0,
+      newRangeStart = 0,
+      curRange = [],
+      oldLine = 1,
+      newLine = 1;
+
+  var _loop = function _loop(i) {
+    var current = diff[i],
+        lines = current.lines || current.value.replace(/\n$/, '').split('\n');
+    current.lines = lines;
+
+    if (current.added || current.removed) {
+      var _curRange;
+
+      // If we have previous context, start with that
+      if (!oldRangeStart) {
+        var prev = diff[i - 1];
+        oldRangeStart = oldLine;
+        newRangeStart = newLine;
+
+        if (prev) {
+          curRange = options.context > 0 ? contextLines(prev.lines.slice(-options.context)) : [];
+          oldRangeStart -= curRange.length;
+          newRangeStart -= curRange.length;
+        }
+      } // Output our changes
+
+
+      (_curRange = curRange).push.apply(_curRange, _toConsumableArray(lines.map(function (entry) {
+        return (current.added ? '+' : '-') + entry;
+      }))); // Track the updated file position
+
+
+      if (current.added) {
+        newLine += lines.length;
+      } else {
+        oldLine += lines.length;
+      }
+    } else {
+      // Identical context lines. Track line changes
+      if (oldRangeStart) {
+        // Close out any changes that have been output (or join overlapping)
+        if (lines.length <= options.context * 2 && i < diff.length - 2) {
+          var _curRange2;
+
+          // Overlapping
+          (_curRange2 = curRange).push.apply(_curRange2, _toConsumableArray(contextLines(lines)));
+        } else {
+          var _curRange3;
+
+          // end the range and output
+          var contextSize = Math.min(lines.length, options.context);
+
+          (_curRange3 = curRange).push.apply(_curRange3, _toConsumableArray(contextLines(lines.slice(0, contextSize))));
+
+          var hunk = {
+            oldStart: oldRangeStart,
+            oldLines: oldLine - oldRangeStart + contextSize,
+            newStart: newRangeStart,
+            newLines: newLine - newRangeStart + contextSize,
+            lines: curRange
+          };
+
+          if (i >= diff.length - 2 && lines.length <= options.context) {
+            // EOF is inside this hunk
+            var oldEOFNewline = /\n$/.test(oldStr);
+            var newEOFNewline = /\n$/.test(newStr);
+            var noNlBeforeAdds = lines.length == 0 && curRange.length > hunk.oldLines;
+
+            if (!oldEOFNewline && noNlBeforeAdds && oldStr.length > 0) {
+              // special case: old has no eol and no trailing context; no-nl can end up before adds
+              // however, if the old file is empty, do not output the no-nl line
+              curRange.splice(hunk.oldLines, 0, '\\ No newline at end of file');
+            }
+
+            if (!oldEOFNewline && !noNlBeforeAdds || !newEOFNewline) {
+              curRange.push('\\ No newline at end of file');
+            }
+          }
+
+          hunks.push(hunk);
+          oldRangeStart = 0;
+          newRangeStart = 0;
+          curRange = [];
+        }
+      }
+
+      oldLine += lines.length;
+      newLine += lines.length;
+    }
+  };
+
+  for (var i = 0; i < diff.length; i++) {
+    _loop(i);
+  }
+
+  return {
+    oldFileName: oldFileName,
+    newFileName: newFileName,
+    oldHeader: oldHeader,
+    newHeader: newHeader,
+    hunks: hunks
+  };
+}
+function formatPatch(diff) {
+  var ret = [];
+
+  if (diff.oldFileName == diff.newFileName) {
+    ret.push('Index: ' + diff.oldFileName);
+  }
+
+  ret.push('===================================================================');
+  ret.push('--- ' + diff.oldFileName + (typeof diff.oldHeader === 'undefined' ? '' : '\t' + diff.oldHeader));
+  ret.push('+++ ' + diff.newFileName + (typeof diff.newHeader === 'undefined' ? '' : '\t' + diff.newHeader));
+
+  for (var i = 0; i < diff.hunks.length; i++) {
+    var hunk = diff.hunks[i]; // Unified Diff Format quirk: If the chunk size is 0,
+    // the first number is one lower than one would expect.
+    // https://www.artima.com/weblogs/viewpost.jsp?thread=164293
+
+    if (hunk.oldLines === 0) {
+      hunk.oldStart -= 1;
+    }
+
+    if (hunk.newLines === 0) {
+      hunk.newStart -= 1;
+    }
+
+    ret.push('@@ -' + hunk.oldStart + ',' + hunk.oldLines + ' +' + hunk.newStart + ',' + hunk.newLines + ' @@');
+    ret.push.apply(ret, hunk.lines);
+  }
+
+  return ret.join('\n') + '\n';
+}
+function createTwoFilesPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
+  return formatPatch(structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options));
+}
+function createPatch(fileName, oldStr, newStr, oldHeader, newHeader, options) {
+  return createTwoFilesPatch(fileName, fileName, oldStr, newStr, oldHeader, newHeader, options);
+}
+
+function arrayEqual(a, b) {
+  if (a.length !== b.length) {
+    return false;
+  }
+
+  return arrayStartsWith(a, b);
+}
+function arrayStartsWith(array, start) {
+  if (start.length > array.length) {
+    return false;
+  }
+
+  for (var i = 0; i < start.length; i++) {
+    if (start[i] !== array[i]) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function calcLineCount(hunk) {
+  var _calcOldNewLineCount = calcOldNewLineCount(hunk.lines),
+      oldLines = _calcOldNewLineCount.oldLines,
+      newLines = _calcOldNewLineCount.newLines;
+
+  if (oldLines !== undefined) {
+    hunk.oldLines = oldLines;
+  } else {
+    delete hunk.oldLines;
+  }
+
+  if (newLines !== undefined) {
+    hunk.newLines = newLines;
+  } else {
+    delete hunk.newLines;
+  }
+}
+function merge(mine, theirs, base) {
+  mine = loadPatch(mine, base);
+  theirs = loadPatch(theirs, base);
+  var ret = {}; // For index we just let it pass through as it doesn't have any necessary meaning.
+  // Leaving sanity checks on this to the API consumer that may know more about the
+  // meaning in their own context.
+
+  if (mine.index || theirs.index) {
+    ret.index = mine.index || theirs.index;
+  }
+
+  if (mine.newFileName || theirs.newFileName) {
+    if (!fileNameChanged(mine)) {
+      // No header or no change in ours, use theirs (and ours if theirs does not exist)
+      ret.oldFileName = theirs.oldFileName || mine.oldFileName;
+      ret.newFileName = theirs.newFileName || mine.newFileName;
+      ret.oldHeader = theirs.oldHeader || mine.oldHeader;
+      ret.newHeader = theirs.newHeader || mine.newHeader;
+    } else if (!fileNameChanged(theirs)) {
+      // No header or no change in theirs, use ours
+      ret.oldFileName = mine.oldFileName;
+      ret.newFileName = mine.newFileName;
+      ret.oldHeader = mine.oldHeader;
+      ret.newHeader = mine.newHeader;
+    } else {
+      // Both changed... figure it out
+      ret.oldFileName = selectField(ret, mine.oldFileName, theirs.oldFileName);
+      ret.newFileName = selectField(ret, mine.newFileName, theirs.newFileName);
+      ret.oldHeader = selectField(ret, mine.oldHeader, theirs.oldHeader);
+      ret.newHeader = selectField(ret, mine.newHeader, theirs.newHeader);
+    }
+  }
+
+  ret.hunks = [];
+  var mineIndex = 0,
+      theirsIndex = 0,
+      mineOffset = 0,
+      theirsOffset = 0;
+
+  while (mineIndex < mine.hunks.length || theirsIndex < theirs.hunks.length) {
+    var mineCurrent = mine.hunks[mineIndex] || {
+      oldStart: Infinity
+    },
+        theirsCurrent = theirs.hunks[theirsIndex] || {
+      oldStart: Infinity
+    };
+
+    if (hunkBefore(mineCurrent, theirsCurrent)) {
+      // This patch does not overlap with any of the others, yay.
+      ret.hunks.push(cloneHunk(mineCurrent, mineOffset));
+      mineIndex++;
+      theirsOffset += mineCurrent.newLines - mineCurrent.oldLines;
+    } else if (hunkBefore(theirsCurrent, mineCurrent)) {
+      // This patch does not overlap with any of the others, yay.
+      ret.hunks.push(cloneHunk(theirsCurrent, theirsOffset));
+      theirsIndex++;
+      mineOffset += theirsCurrent.newLines - theirsCurrent.oldLines;
+    } else {
+      // Overlap, merge as best we can
+      var mergedHunk = {
+        oldStart: Math.min(mineCurrent.oldStart, theirsCurrent.oldStart),
+        oldLines: 0,
+        newStart: Math.min(mineCurrent.newStart + mineOffset, theirsCurrent.oldStart + theirsOffset),
+        newLines: 0,
+        lines: []
+      };
+      mergeLines(mergedHunk, mineCurrent.oldStart, mineCurrent.lines, theirsCurrent.oldStart, theirsCurrent.lines);
+      theirsIndex++;
+      mineIndex++;
+      ret.hunks.push(mergedHunk);
+    }
+  }
+
+  return ret;
+}
+
+function loadPatch(param, base) {
+  if (typeof param === 'string') {
+    if (/^@@/m.test(param) || /^Index:/m.test(param)) {
+      return parsePatch(param)[0];
+    }
+
+    if (!base) {
+      throw new Error('Must provide a base reference or pass in a patch');
+    }
+
+    return structuredPatch(undefined, undefined, base, param);
+  }
+
+  return param;
+}
+
+function fileNameChanged(patch) {
+  return patch.newFileName && patch.newFileName !== patch.oldFileName;
+}
+
+function selectField(index, mine, theirs) {
+  if (mine === theirs) {
+    return mine;
+  } else {
+    index.conflict = true;
+    return {
+      mine: mine,
+      theirs: theirs
+    };
+  }
+}
+
+function hunkBefore(test, check) {
+  return test.oldStart < check.oldStart && test.oldStart + test.oldLines < check.oldStart;
+}
+
+function cloneHunk(hunk, offset) {
+  return {
+    oldStart: hunk.oldStart,
+    oldLines: hunk.oldLines,
+    newStart: hunk.newStart + offset,
+    newLines: hunk.newLines,
+    lines: hunk.lines
+  };
+}
+
+function mergeLines(hunk, mineOffset, mineLines, theirOffset, theirLines) {
+  // This will generally result in a conflicted hunk, but there are cases where the context
+  // is the only overlap where we can successfully merge the content here.
+  var mine = {
+    offset: mineOffset,
+    lines: mineLines,
+    index: 0
+  },
+      their = {
+    offset: theirOffset,
+    lines: theirLines,
+    index: 0
+  }; // Handle any leading content
+
+  insertLeading(hunk, mine, their);
+  insertLeading(hunk, their, mine); // Now in the overlap content. Scan through and select the best changes from each.
+
+  while (mine.index < mine.lines.length && their.index < their.lines.length) {
+    var mineCurrent = mine.lines[mine.index],
+        theirCurrent = their.lines[their.index];
+
+    if ((mineCurrent[0] === '-' || mineCurrent[0] === '+') && (theirCurrent[0] === '-' || theirCurrent[0] === '+')) {
+      // Both modified ...
+      mutualChange(hunk, mine, their);
+    } else if (mineCurrent[0] === '+' && theirCurrent[0] === ' ') {
+      var _hunk$lines;
+
+      // Mine inserted
+      (_hunk$lines = hunk.lines).push.apply(_hunk$lines, _toConsumableArray(collectChange(mine)));
+    } else if (theirCurrent[0] === '+' && mineCurrent[0] === ' ') {
+      var _hunk$lines2;
+
+      // Theirs inserted
+      (_hunk$lines2 = hunk.lines).push.apply(_hunk$lines2, _toConsumableArray(collectChange(their)));
+    } else if (mineCurrent[0] === '-' && theirCurrent[0] === ' ') {
+      // Mine removed or edited
+      removal(hunk, mine, their);
+    } else if (theirCurrent[0] === '-' && mineCurrent[0] === ' ') {
+      // Their removed or edited
+      removal(hunk, their, mine, true);
+    } else if (mineCurrent === theirCurrent) {
+      // Context identity
+      hunk.lines.push(mineCurrent);
+      mine.index++;
+      their.index++;
+    } else {
+      // Context mismatch
+      conflict(hunk, collectChange(mine), collectChange(their));
+    }
+  } // Now push anything that may be remaining
+
+
+  insertTrailing(hunk, mine);
+  insertTrailing(hunk, their);
+  calcLineCount(hunk);
+}
+
+function mutualChange(hunk, mine, their) {
+  var myChanges = collectChange(mine),
+      theirChanges = collectChange(their);
+
+  if (allRemoves(myChanges) && allRemoves(theirChanges)) {
+    // Special case for remove changes that are supersets of one another
+    if (arrayStartsWith(myChanges, theirChanges) && skipRemoveSuperset(their, myChanges, myChanges.length - theirChanges.length)) {
+      var _hunk$lines3;
+
+      (_hunk$lines3 = hunk.lines).push.apply(_hunk$lines3, _toConsumableArray(myChanges));
+
+      return;
+    } else if (arrayStartsWith(theirChanges, myChanges) && skipRemoveSuperset(mine, theirChanges, theirChanges.length - myChanges.length)) {
+      var _hunk$lines4;
+
+      (_hunk$lines4 = hunk.lines).push.apply(_hunk$lines4, _toConsumableArray(theirChanges));
+
+      return;
+    }
+  } else if (arrayEqual(myChanges, theirChanges)) {
+    var _hunk$lines5;
+
+    (_hunk$lines5 = hunk.lines).push.apply(_hunk$lines5, _toConsumableArray(myChanges));
+
+    return;
+  }
+
+  conflict(hunk, myChanges, theirChanges);
+}
+
+function removal(hunk, mine, their, swap) {
+  var myChanges = collectChange(mine),
+      theirChanges = collectContext(their, myChanges);
+
+  if (theirChanges.merged) {
+    var _hunk$lines6;
+
+    (_hunk$lines6 = hunk.lines).push.apply(_hunk$lines6, _toConsumableArray(theirChanges.merged));
+  } else {
+    conflict(hunk, swap ? theirChanges : myChanges, swap ? myChanges : theirChanges);
+  }
+}
+
+function conflict(hunk, mine, their) {
+  hunk.conflict = true;
+  hunk.lines.push({
+    conflict: true,
+    mine: mine,
+    theirs: their
+  });
+}
+
+function insertLeading(hunk, insert, their) {
+  while (insert.offset < their.offset && insert.index < insert.lines.length) {
+    var line = insert.lines[insert.index++];
+    hunk.lines.push(line);
+    insert.offset++;
+  }
+}
+
+function insertTrailing(hunk, insert) {
+  while (insert.index < insert.lines.length) {
+    var line = insert.lines[insert.index++];
+    hunk.lines.push(line);
+  }
+}
+
+function collectChange(state) {
+  var ret = [],
+      operation = state.lines[state.index][0];
+
+  while (state.index < state.lines.length) {
+    var line = state.lines[state.index]; // Group additions that are immediately after subtractions and treat them as one "atomic" modify change.
+
+    if (operation === '-' && line[0] === '+') {
+      operation = '+';
+    }
+
+    if (operation === line[0]) {
+      ret.push(line);
+      state.index++;
+    } else {
+      break;
+    }
+  }
+
+  return ret;
+}
+
+function collectContext(state, matchChanges) {
+  var changes = [],
+      merged = [],
+      matchIndex = 0,
+      contextChanges = false,
+      conflicted = false;
+
+  while (matchIndex < matchChanges.length && state.index < state.lines.length) {
+    var change = state.lines[state.index],
+        match = matchChanges[matchIndex]; // Once we've hit our add, then we are done
+
+    if (match[0] === '+') {
+      break;
+    }
+
+    contextChanges = contextChanges || change[0] !== ' ';
+    merged.push(match);
+    matchIndex++; // Consume any additions in the other block as a conflict to attempt
+    // to pull in the remaining context after this
+
+    if (change[0] === '+') {
+      conflicted = true;
+
+      while (change[0] === '+') {
+        changes.push(change);
+        change = state.lines[++state.index];
+      }
+    }
+
+    if (match.substr(1) === change.substr(1)) {
+      changes.push(change);
+      state.index++;
+    } else {
+      conflicted = true;
+    }
+  }
+
+  if ((matchChanges[matchIndex] || '')[0] === '+' && contextChanges) {
+    conflicted = true;
+  }
+
+  if (conflicted) {
+    return changes;
+  }
+
+  while (matchIndex < matchChanges.length) {
+    merged.push(matchChanges[matchIndex++]);
+  }
+
+  return {
+    merged: merged,
+    changes: changes
+  };
+}
+
+function allRemoves(changes) {
+  return changes.reduce(function (prev, change) {
+    return prev && change[0] === '-';
+  }, true);
+}
+
+function skipRemoveSuperset(state, removeChanges, delta) {
+  for (var i = 0; i < delta; i++) {
+    var changeContent = removeChanges[removeChanges.length - delta + i].substr(1);
+
+    if (state.lines[state.index + i] !== ' ' + changeContent) {
+      return false;
+    }
+  }
+
+  state.index += delta;
+  return true;
+}
+
+function calcOldNewLineCount(lines) {
+  var oldLines = 0;
+  var newLines = 0;
+  lines.forEach(function (line) {
+    if (typeof line !== 'string') {
+      var myCount = calcOldNewLineCount(line.mine);
+      var theirCount = calcOldNewLineCount(line.theirs);
+
+      if (oldLines !== undefined) {
+        if (myCount.oldLines === theirCount.oldLines) {
+          oldLines += myCount.oldLines;
+        } else {
+          oldLines = undefined;
+        }
+      }
+
+      if (newLines !== undefined) {
+        if (myCount.newLines === theirCount.newLines) {
+          newLines += myCount.newLines;
+        } else {
+          newLines = undefined;
+        }
+      }
+    } else {
+      if (newLines !== undefined && (line[0] === '+' || line[0] === ' ')) {
+        newLines++;
+      }
+
+      if (oldLines !== undefined && (line[0] === '-' || line[0] === ' ')) {
+        oldLines++;
+      }
+    }
+  });
+  return {
+    oldLines: oldLines,
+    newLines: newLines
+  };
+}
+
+// See: http://code.google.com/p/google-diff-match-patch/wiki/API
+function convertChangesToDMP(changes) {
+  var ret = [],
+      change,
+      operation;
+
+  for (var i = 0; i < changes.length; i++) {
+    change = changes[i];
+
+    if (change.added) {
+      operation = 1;
+    } else if (change.removed) {
+      operation = -1;
+    } else {
+      operation = 0;
+    }
+
+    ret.push([operation, change.value]);
+  }
+
+  return ret;
+}
+
+function convertChangesToXML(changes) {
+  var ret = [];
+
+  for (var i = 0; i < changes.length; i++) {
+    var change = changes[i];
+
+    if (change.added) {
+      ret.push('<ins>');
+    } else if (change.removed) {
+      ret.push('<del>');
+    }
+
+    ret.push(escapeHTML(change.value));
+
+    if (change.added) {
+      ret.push('</ins>');
+    } else if (change.removed) {
+      ret.push('</del>');
+    }
+  }
+
+  return ret.join('');
+}
+
+function escapeHTML(s) {
+  var n = s;
+  n = n.replace(/&/g, '&amp;');
+  n = n.replace(/</g, '&lt;');
+  n = n.replace(/>/g, '&gt;');
+  n = n.replace(/"/g, '&quot;');
+  return n;
+}
+
+export { Diff, applyPatch, applyPatches, canonicalize, convertChangesToDMP, convertChangesToXML, createPatch, createTwoFilesPatch, diffArrays, diffChars, diffCss, diffJson, diffLines, diffSentences, diffTrimmedLines, diffWords, diffWordsWithSpace, merge, parsePatch, structuredPatch };