Fix Webpack 4 DefinePlugin config

Author: jbruni

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Draft
 - Fix wishlist dropdown background color bleeding out of container [#1283](https://github.com/bigcommerce/cornerstone/pull/1283)
 - Fix indefinite load spinner for products without an image in order history. [#1284](https://github.com/bigcommerce/cornerstone/pull/1284)
+- Fix Webpack DefinePlugin configuration. [#1286](https://github.com/bigcommerce/cornerstone/pull/1286)
 
 ## 2.2.0 (2018-06-22)
 - Fix quantity edit on Simple Product AMP pages. [#1257](https://github.com/bigcommerce/cornerstone/pull/1257)

webpack.dev.js

@@ -7,7 +7,7 @@ module.exports = merge(commonConfig, {
     devtool: 'source-map',
     plugins: [
         new webpack.DefinePlugin({
-            'process.env.NODE_ENV': 'development',
+            'process.env.NODE_ENV': JSON.stringify('development'),
         }),
     ],
 });

webpack.prod.js

@@ -6,7 +6,7 @@ module.exports = merge(commonConfig, {
     mode: 'production',
     plugins: [
         new webpack.DefinePlugin({
-            'process.env.NODE_ENV': 'production',
+            'process.env.NODE_ENV': JSON.stringify('production'),
         }),
     ],
 });