feat: Canceling flows (#1542)

* cancelable foreach

* cancelable waterfall

* cancellable auto

* fix lint

* fix tests

* cancelable whilst/until/during/forever

* fix waterfall test.  It WILL get there

* docs

* auto should not start other tasks once canceled

* simplify waterfall, add test for arrays

* simplify eachOf

* cancelable retry

* cancelable eachOf for arrays

* revert test tweak

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/eachOf.js b/lib/eachOf.js
index bb9edfa..5dbeb81 100644
--- a/lib/eachOf.js
+++ b/lib/eachOf.js
@@ -12,12 +12,17 @@ function eachOfArrayLike(coll, iteratee, callback) {
     callback = once(callback || noop);
     var index = 0,
         completed = 0,
-        length = coll.length;
+        length = coll.length,
+        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) {