From 88d37a13d1f6cb4eda12ed59850d3e8f9114605b Mon Sep 17 00:00:00 2001
From: "Manu Mtz.-Almeida" <manu.mtza@gmail.com>
Date: Tue, 23 Jul 2019 18:44:41 +0200
Subject: [PATCH] perf(): speed up www dev build

---
 src/compiler/config/test/validate-output-www.spec.ts | 4 ++--
 src/compiler/config/validate-outputs-www.ts          | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/compiler/config/test/validate-output-www.spec.ts b/src/compiler/config/test/validate-output-www.spec.ts
index af309ed9ce4..f36b54c38ef 100644
--- a/src/compiler/config/test/validate-output-www.spec.ts
+++ b/src/compiler/config/test/validate-output-www.spec.ts
@@ -51,8 +51,8 @@ describe('validateOutputTargetWww', () => {
       'esmDir': path.join(rootDir, 'www', 'docs', 'build'),
       'isBrowserBuild': true,
       'polyfills': true,
-      'systemDir': path.join(rootDir, 'www', 'docs', 'build'),
-      'systemLoaderFile': path.join(rootDir, '/www/docs/build/undefined.js'),
+      'systemDir': undefined,
+      'systemLoaderFile': undefined,
       'type': 'dist-lazy'
     }, {
       'copyAssets': 'dist',
diff --git a/src/compiler/config/validate-outputs-www.ts b/src/compiler/config/validate-outputs-www.ts
index b02a50de609..fe729c12ab9 100644
--- a/src/compiler/config/validate-outputs-www.ts
+++ b/src/compiler/config/validate-outputs-www.ts
@@ -73,9 +73,9 @@ function validateOutputTarget(config: d.Config, diagnostics: d.Diagnostic[], out
   config.outputTargets.push({
     type: DIST_LAZY,
     esmDir: buildDir,
-    systemDir: buildDir,
+    systemDir: config.buildEs5 ? buildDir : undefined,
+    systemLoaderFile: config.buildEs5 ? config.sys.path.join(buildDir, `${config.fsNamespace}.js`) : undefined,
     polyfills: outputTarget.polyfills,
-    systemLoaderFile: config.sys.path.join(buildDir, `${config.fsNamespace}.js`),
     isBrowserBuild: true,
   });