webpack.common.js

/* eslint-disable import/no-extraneous-dependencies */
const path = require('path');
const webpack = require('webpack');

/*
 * SplitChunksPlugin is enabled by default and replaced
 * deprecated CommonsChunkPlugin. It automatically identifies modules which
 * should be splitted of chunk by heuristics using module duplication count and
 * module category (i. e. node_modules). And splits the chunks…
 *
 * It is safe to remove "splitChunks" from the generated configuration
 * and was added as an educational example.
 *
 * https://webpack.js.org/plugins/split-chunks-plugin/
 *
 */

const HtmlWebpackPlugin = require('html-webpack-plugin');

/*
 * We've enabled HtmlWebpackPlugin for you! This generates a html
 * page for you when you compile webpack, which will make you start
 * developing and prototyping faster.
 *
 * https://github.com/jantimon/html-webpack-plugin
 *
 */

const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = {
  entry: './src/index.js',

  output: {
    // filename: '[name].[chunkhash].js',
    path: path.resolve(__dirname, 'dist'),
    library: 'tracker',
    libraryTarget: 'umd',
    filename: 'tracker.js',
    auxiliaryComment: 'Event Tracker',
  },

  plugins: [
    new webpack.ProgressPlugin(),
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: 'demo/index.html',
    })],

  module: {
    rules: [
      {
        test: /.(js|jsx)$/,
        include: [path.resolve(__dirname, 'src')],
        loader: 'babel-loader',

        options: {
          plugins: ['syntax-dynamic-import'],

          presets: [
            [
              '@babel/preset-env',
              {
                modules: false,
              },
            ],
          ],
        },
      },
    ],
  },

  optimization: {
    splitChunks: {
      cacheGroups: {
        vendors: {
          priority: -10,
          test: /[\\/]node_modules[\\/]/,
        },
      },

      chunks: 'async',
      minChunks: 1,
      minSize: 30000,
      name: true,
    },
  },
};