From df6d331a59894194d417e0d41bf57bd787d1d70d Mon Sep 17 00:00:00 2001
From: Filipe Silva <filipematossilva@gmail.com>
Date: Wed, 26 Jul 2017 15:51:55 +0100
Subject: [PATCH] fix(@angular/cli): use 3 uglify passes with build-optimizer

PURE comments work best with 3 passes.
See https://github.com/webpack/webpack/issues/2899#issuecomment-317425926 for context and an example.

Thanks to @kzc for highlighting this.
---
 packages/@angular/cli/models/webpack-configs/production.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/@angular/cli/models/webpack-configs/production.ts b/packages/@angular/cli/models/webpack-configs/production.ts
index 4e574f7428d2..cf75534ab913 100644
--- a/packages/@angular/cli/models/webpack-configs/production.ts
+++ b/packages/@angular/cli/models/webpack-configs/production.ts
@@ -98,6 +98,9 @@ export const getProdConfig = function (wco: WebpackConfigOptions) {
     // This plugin must be before webpack.optimize.UglifyJsPlugin.
     extraPlugins.push(new PurifyPlugin());
     uglifyCompressOptions.pure_getters = true;
+    // PURE comments work best with 3 passes.
+    // See https://github.com/webpack/webpack/issues/2899#issuecomment-317425926.
+    uglifyCompressOptions.passes = 3;
   }
 
   return {