✨ Add mixins to alias

build/webpack.prod.conf.js

@@ -1,6 +1,9 @@
 const webpack = require('webpack')
 const base = require('./webpack.base.conf')
 const config = require('../config')
+var env = process.env.NODE_ENV === 'testing'
+  ? require('../config/test.env')
+  : config.build.env
 
 base.entry = {
   lib: './src/index.js'
@@ -19,9 +22,7 @@ var webpackConfig = Object.assign({}, base)
 webpackConfig.devtool = '#source-map'
 webpackConfig.plugins = (webpackConfig.plugins || []).concat([
   new webpack.DefinePlugin({
-    'process.env': {
-      NODE_ENV: '"production"'
-    }
+    'process.env.NODE_ENV': env
   }),
   new webpack.optimize.UglifyJsPlugin({
     compress: { warnings: false }