Fix async compatibility with Internet Explorer 10

This fixes async to work on Internet Explorer 10. Internet Explorer 10
requires that the `setImmediate` function is not called as a method. As
such, it cannot simply be aliased as `async.setImmediate` and
`async.nextTick` as `Invalid calling object` error will be encountered
since `setImmediate` will be called with `this` set to `async`.

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/async.js b/lib/async.js
index 46f4f50..cb6320d 100755
--- a/lib/async.js
+++ b/lib/async.js
@@ -75,8 +75,11 @@
     //// nextTick implementation with browser-compatible fallback ////
     if (typeof process === 'undefined' || !(process.nextTick)) {
         if (typeof setImmediate === 'function') {
-            async.setImmediate = setImmediate;
-            async.nextTick = setImmediate;
+            async.nextTick = function (fn) {
+                // not a direct alias for IE10 compatibility
+                setImmediate(fn);
+            };
+            async.setImmediate = async.nextTick;
         }
         else {
             async.nextTick = function (fn) {