webpack.main.prod.config.js

const path = require('path');
const merge = require('webpack-merge');
const webpack = require('webpack');

const webpackDevConfig = require('./webpack.main.dev.config');

module.exports = merge.smart(webpackDevConfig, {
  devtool: 'none',

  mode: 'production',

  output: {
    path: path.join(__dirname, 'dist/main'),
    filename: 'main.prod.js'
  },

  plugins: [
    new webpack.EnvironmentPlugin({
      NODE_ENV: 'production'
    })
  ]
});