Merge pull request #3985 from ide/array-check

Replace "instanceof Array" in transformer with "[object Array]" comparison
jashkenas · Jun 5, 2015 · 1f197fc · 1f197fc
2 parents e339f5f + 2087923
commit 1f197fc
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diff --git a/lib/coffee-script/helpers.js b/lib/coffee-script/helpers.js
diff --git a/src/helpers.coffee b/src/helpers.coffee
@@ -49,7 +49,7 @@ extend = exports.extend = (object, properties) ->
 exports.flatten = flatten = (array) ->
   flattened = []
   for element in array
-    if element instanceof Array
+    if '[object Array]' is Object::toString.call element
       flattened = flattened.concat flatten element
     else
       flattened.push element