a

modules/@angular/compiler/src/compile_metadata.ts

@@ -81,7 +81,6 @@ function _sanitizeIdentifier(name: string): string {
 }
 
 let _anonymousTypeIndex = 0;
-const anonymousTypes = new WeakMap<any, string>();
 
 export function identifierName(compileIdentifier: CompileIdentifierMetadata): string {
   if (!compileIdentifier || !compileIdentifier.reference) {
@@ -91,15 +90,17 @@ export function identifierName(compileIdentifier: CompileIdentifierMetadata): st
   if (ref instanceof StaticSymbol) {
     return ref.name;
   }
-  if (anonymousTypes.has(ref)) {
-    return anonymousTypes.get(ref);
+  if (typeof ref === 'symbol') {
+    return stringify(ref);
   }
-
-  let identifier: string = stringify(ref);
+  if (ref['__anonymousType']) {
+    return ref['__anonymousType'];
+  }
+  let identifier = stringify(ref);
   if (identifier.indexOf('(') >= 0) {
-    // case: anonymous functions or Symbol!
+    // case: anonymous functions!
     identifier = `anonymous_${_anonymousTypeIndex++}`;
-    anonymousTypes.set(ref, identifier);
+    ref['__anonymousType'] = identifier;
   } else {
     identifier = _sanitizeIdentifier(identifier);
   }