text: 
  var webpackMerge = require('webpack-merge');
  var EnvironmentVariablesPlugin = require('environment-variables-webpack-plugin');
  var commonConfig = require('./webpack.config.js');
  
  module.exports = webpackMerge(commonConfig, {
  
      plugins: [
          new EnvironmentVariablesPlugin(
              {
                  optionsFile: 'config/dev.json',
                  chunks:['main'],
                  skipUndefinedVars: false
              }
          )
      ]
  
  });
  