From 43c0e9a6bb83bef9f8169158023edc59f2689259 Mon Sep 17 00:00:00 2001
From: Chuck Jazdzewski <chuckj@google.com>
Date: Wed, 30 Nov 2016 11:07:02 -0800
Subject: [PATCH] fix(compiler): fix performance regression caused by 5b0f9e2

Fixes #13146
---
 modules/@angular/compiler/src/metadata_resolver.ts | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/modules/@angular/compiler/src/metadata_resolver.ts b/modules/@angular/compiler/src/metadata_resolver.ts
index 7bda86c672..faba178acb 100644
--- a/modules/@angular/compiler/src/metadata_resolver.ts
+++ b/modules/@angular/compiler/src/metadata_resolver.ts
@@ -126,7 +126,7 @@ export class CompileMetadataResolver {
     return null;
   }
 
-  private _loadDirectiveMetadata(directiveType: any, isSync: boolean): Promise<any> {
+  private _loadDirectiveMetadata(directiveType: any, isSync: boolean): () => Promise<any> {
     if (this._directiveCache.has(directiveType)) {
       return;
     }
@@ -176,7 +176,7 @@ export class CompileMetadataResolver {
         if (isSync) {
           throw new ComponentStillLoadingError(directiveType);
         }
-        return templateMeta.asyncResult.then(createDirectiveMetadata);
+        return () => templateMeta.asyncResult.then(createDirectiveMetadata);
       }
     } else {
       // directive
@@ -423,8 +423,10 @@ export class CompileMetadataResolver {
           transitiveModule.directives.push(declaredIdentifier);
           declaredDirectives.push(declaredIdentifier);
           this._addTypeToModule(declaredType, moduleType);
-          transitiveModule.directiveLoaders.push(
-              () => this._loadDirectiveMetadata(declaredType, isSync));
+          const loader = this._loadDirectiveMetadata(declaredType, isSync);
+          if (loader) {
+            transitiveModule.directiveLoaders.push(loader);
+          }
         } else if (this._pipeResolver.isPipe(declaredType)) {
           transitiveModule.pipesSet.add(declaredType);
           transitiveModule.pipes.push(declaredIdentifier);