fix(core): use then directly when promise is not patchable (#1079)

angular · Jun 18, 2018 · d7e0a31 · d7e0a31
1 parent 14cfc68
commit d7e0a31
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/lib/zone.ts b/lib/zone.ts
@@ -1267,7 +1267,13 @@ const Zone: ZoneType = (function(global: any) {
         }
       }
       if (nativeMicroTaskQueuePromise) {
-        nativeMicroTaskQueuePromise[symbolThen](drainMicroTaskQueue);
+        let nativeThen = nativeMicroTaskQueuePromise[symbolThen];
+        if (!nativeThen) {
+          // native Promise is not patchable, we need to use `then` directly
+          // issue 1078
+          nativeThen = nativeMicroTaskQueuePromise['then'];
+        }
+        nativeThen.call(nativeMicroTaskQueuePromise, drainMicroTaskQueue);
       } else {
         global[symbolSetTimeout](drainMicroTaskQueue, 0);
       }