fixing source-maps (#694)

Author: pooyaj

tester/webpack.config.js

@@ -4,6 +4,7 @@ const HtmlWebpackPlugin = require('html-webpack-plugin');
 module.exports = {
   mode: 'none',
   entry: './src/index.js',
+  devtool: 'source-map',
   output: {
     path: __dirname + '/dist',
     filename: 'bundle.js'

webpack.config.tester.js

@@ -23,8 +23,8 @@ var plugins = [];
 
 module.exports = {
   entry: entries,
-  mode: process.env.NODE_ENV || 'development',
-  devtool: 'source-map',
+  mode: 'development',
+  devtool: 'eval-source-map',
   output: {
     filename: '[name]/latest/[name].dynamic.js.gz',
     chunkFilename: 'vendor/[name].[contenthash].js.gz',