From 5504e92c15afdd51abdb530ba9f23f78b860a856 Mon Sep 17 00:00:00 2001
From: Wykks <Wykks@users.noreply.github.com>
Date: Wed, 4 Oct 2017 16:41:23 +0200
Subject: [PATCH] fix(@angular/cli): Disable comparisons feature in uglify
 compression in production

---
 .../@angular/cli/models/webpack-configs/production.ts     | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/@angular/cli/models/webpack-configs/production.ts b/packages/@angular/cli/models/webpack-configs/production.ts
index c7e5917b331c..0afa97bfb3ac 100644
--- a/packages/@angular/cli/models/webpack-configs/production.ts
+++ b/packages/@angular/cli/models/webpack-configs/production.ts
@@ -103,7 +103,13 @@ export function getProdConfig(wco: WebpackConfigOptions) {
     }));
   }
 
-  const uglifyCompressOptions: any = {};
+  const uglifyCompressOptions: any = {
+      // Disabled because of an issue with Uglify breaking seemingly valid code:
+      // https://github.com/angular/angular-cli/issues/5804
+      // Further investigation:
+      // https://github.com/mishoo/UglifyJS2/issues/2011
+      comparisons: false
+  };
 
   if (buildOptions.buildOptimizer) {
     // This plugin must be before webpack.optimize.UglifyJsPlugin.