fix: throw if trying to load zone more then once.

angular · Aug 15, 2016 · 6df5f93 · 6df5f93
1 parent 7b9a00c
commit 6df5f93
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/lib/zone.ts b/lib/zone.ts
@@ -492,6 +492,9 @@ type AmbientZone = Zone;
 type AmbientZoneDelegate = ZoneDelegate;
 
 const Zone: ZoneType = (function(global: any) {
+  if (global.Zone) {
+    throw new Error('Zone already loaded.');
+  }
   class Zone implements AmbientZone {
     static __symbol__: (name: string) => string = __symbol__;