From 71ae96d0ed0a8365c98dc17b7d4d4669e965f35f Mon Sep 17 00:00:00 2001
From: Charles Lyding <19598772+clydin@users.noreply.github.com>
Date: Mon, 19 Mar 2018 11:35:15 -0400
Subject: [PATCH] feat(@angular-devkit/build-optimizer): support webpack side
 effects flag

---
 .../build_optimizer/src/build-optimizer/webpack-loader.ts      | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/angular_devkit/build_optimizer/src/build-optimizer/webpack-loader.ts b/packages/angular_devkit/build_optimizer/src/build-optimizer/webpack-loader.ts
index 215e488de6..e05666f8b5 100644
--- a/packages/angular_devkit/build_optimizer/src/build-optimizer/webpack-loader.ts
+++ b/packages/angular_devkit/build_optimizer/src/build-optimizer/webpack-loader.ts
@@ -32,6 +32,9 @@ export default function buildOptimizerLoader
     inputFilePath,
     outputFilePath,
     emitSourceMap: options.sourceMap,
+    isSideEffectFree: this._module
+                      && this._module.factoryMeta
+                      && this._module.factoryMeta.sideEffectFree,
   });
 
   if (boOutput.emitSkipped || boOutput.content === null) {