From f4d31b8cc9f3abfaa7918cae670cabb497d654e9 Mon Sep 17 00:00:00 2001
From: David Ascher <david.ascher@gmail.com>
Date: Sat, 27 May 2017 04:36:42 -0700
Subject: [PATCH] Disable comparisons feature in uglify compression in
 production (#2379)

* Disable a micro-option in uglify that appears to be buggy

See https://github.com/facebookincubator/create-react-app/issues/2376

* wrong plugin

* Add a comment
---
 packages/react-scripts/config/webpack.config.prod.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/packages/react-scripts/config/webpack.config.prod.js b/packages/react-scripts/config/webpack.config.prod.js
index fec81bcabb7..5943c14502c 100644
--- a/packages/react-scripts/config/webpack.config.prod.js
+++ b/packages/react-scripts/config/webpack.config.prod.js
@@ -282,6 +282,11 @@ module.exports = {
     new webpack.optimize.UglifyJsPlugin({
       compress: {
         warnings: false,
+        // Disabled because of an issue with Uglify breaking seemingly valid code:
+        // https://github.com/facebookincubator/create-react-app/issues/2376
+        // Pending further investigation:
+        // https://github.com/mishoo/UglifyJS2/issues/2011
+        comparisons: false,
       },
       output: {
         comments: false,