Как настроить Webpack для работы в разных средах (разработка, тестирование, производство)?

module.exports = {
  entry: './src/index.js',
  output: {
    filename: '[name].[contenthash].js',
    path: __dirname + '/dist',
  },
  module: {
    rules: [
      { test: /\.css$/, use: ['style-loader', 'css-loader'] },
    ],
  },
};

const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');

module.exports = merge(common, {
  mode: 'development',
  devtool: 'inline-source-map',
  devServer: {
    hot: true,
  },
});

const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');

module.exports = merge(common, {
  mode: 'production',
  optimization: {
    minimize: true,
    minimizer: ['...', new CssMinimizerPlugin()],
  },
});