Removing souce maps from production mode.

webpack.config.js

@@ -4,11 +4,13 @@ const path = require('path');
 
 const DIST = path.resolve("./dist");
 const MODE = process.env.NODE_ENV || 'development';
+const SOURCE_MAP = 'sourec-map';
+const DEVTOOL = (process.env.NODE_ENV === 'development') ? SOURCE_MAP : false;
 
 console.log('Webpack mode:', MODE); // eslint-disable-line no-console
 
 const config = {
-  devtool: 'source-map',
+  devtool: DEVTOOL,
   entry: ['./src/index.js'],
   externals: {
     jquery: {