webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const envConfig = require('./config/env.config');
const appVersion = require('./package.json').version;

const stages = {
  dev: 'dev',
  staging: 'stg',
  production: 'prod',
};

// Webpack 4 Modes
const modes = {
  dev: 'development',
  production: 'production',
};

const sourceMaps = {
  dev: 'source-map',
  stg: 'none',
  prod: 'none',
};
const { env } = process;
const { stage = stages.dev, NODE_ENV: mode = modes.dev, out } = env;
const config = envConfig[stage];
const rootDir = path.resolve(__dirname);
const src = `${rootDir}/src`;
const buildDir = out || `${rootDir}/build`;
const publicPath = './build/static/public';
const plugins = [
  new HtmlWebpackPlugin({
    filename: 'index.html',
    title: 'Web',
    template: `${src}/index.html`,
    trackingId: config.segmentTrackingId,
    appVersion,
  }),
  new MiniCssExtractPlugin({
    filename: '[name].css',
    chunkFilename: '[name].[id].css',
  }),
];
module.exports = {
  mode,
  bail: true,
  context: rootDir,
  devtool: sourceMaps[stage],
  entry: {
    app: `${src}/index.js`,
  },
  optimization: {
    minimize: true,
    minimizer: [
      new UglifyJsPlugin({
        sourceMap: true,
        uglifyOptions: {
          exclude: module => /node_modules/.test(module.resource),
          compress: {
            warnings: true,
          },
          mangle: false,
          output: {
            beautify: true,
            comments: false,
          },
          warnings: true,
        },
      }),
    ],
    nodeEnv: mode,
    splitChunks: {
      name: 'vendor',
      minChunks: 3,
    },
    mergeDuplicateChunks: true,
  },
  target: 'web',
  output: {
    path: `${buildDir}`,
    filename: `${publicPath}/js/[name].[hash].js`,
    chunkFilename: `${publicPath}/js/[name].[chunkhash].js`,
    crossOriginLoading: false,
    publicPath: config.publicPath || '/',
  },
  resolve: {
    modules: [src, `${rootDir}/node_modules/`],
    extensions: ['.js', '.jsx', '.scss', '.css'],
  },
  externals: {
    AppConfig: JSON.stringify(config),
  },
  module: {
    strictExportPresence: true,
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              sourceMap: stage !== stages.production,
            },
          }, {
            loader: 'sass-loader',
            options: {
              includePaths: [
                `${src}/styles`,
              ],
            },
          },
        ],
      },
      {
        test: /\.(ttf|eot|woff)(\?[a-z0-9=&.]+)?$/i,
        use: [
          {
            loader: 'file-loader',
            query: {
              hash: 'sha512',
              digest: 'hex',
              name: '[name].[hash].[ext]',
            },
          },
        ],
      },
      {
        test: /\.(jpe?g|png|gif|svg)(\?[a-z0-9=&.]+)?$/i,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 8192,
            },
          },
        ],
      },
    ],
  },
  plugins,
};