webpack.config.js

const path = require('path')
const cp = require('child_process');
const { VueLoaderPlugin } = require('vue-loader')
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const CleanWebpackPlugin = require('clean-webpack-plugin')
const WorkboxPlugin = require('workbox-webpack-plugin')

// Get git info via command line
let gitVersion = cp.execSync('git rev-list --count HEAD').toString().replace(/(\r\n|\n|\r)/gm, "");
let gitCommitHash = cp.execSync('git rev-parse --short HEAD').toString().replace(/(\r\n|\n|\r)/gm, "");

module.exports = (env, argv) => ({
  mode: argv && argv.mode || 'development',
  devtool: (argv && argv.mode || 'development') === 'production' ? 'source-map' : 'eval',

  entry: './src/app.js',

  output: {
    path: path.resolve(__dirname, 'dist'),
    publicPath: '/',
    filename: '[name].js'
  },

  node: {
    fs: 'empty',
    path: 'empty'
  },

  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader'
      },
      {
        test: /\.js$/,
        loader: 'babel-loader'
      },
      {
        test: /\.css$/,
        use: [
          'vue-style-loader',
          'css-loader'
        ],
        exclude: /\.module\.css$/
      },
      {
        test: /\.scss$/,
        use: [
          'vue-style-loader',
          'css-loader',
          'sass-loader'
        ]
      }
    ]
  },

  resolve: {
    extensions: [
      '.js',
      '.vue',
      '.json'
    ],
    alias: {
      'vue$': 'vue/dist/vue.esm.js',
      '@': path.resolve(__dirname, 'src')
    }
  },

  plugins: [
    new CleanWebpackPlugin(['dist']),
    new VueLoaderPlugin(),
    new HtmlWebpackPlugin({
      template: path.resolve(__dirname, 'static', 'index.html'),
      inject: true
    }),
    new CopyWebpackPlugin([{
      from: path.resolve(__dirname, 'static'),
      to: path.resolve(__dirname, 'dist'),
      toType: 'dir'
    }]),
    new WorkboxPlugin.InjectManifest({
      swSrc: './src/sw.js',
      swDest: 'sw.js'
    }),
    new webpack.DefinePlugin({
      __VERSION__: JSON.stringify(gitVersion),
      __VERSION_HASH__: JSON.stringify(gitCommitHash)
    }),
    new CopyWebpackPlugin([{
      from: path.resolve(__dirname, 'version.json'),
      to: path.resolve(__dirname, 'dist', 'version.json'),
      noErrorOnMissing: true,
      transform (content, path) {
        return JSON.stringify({
            version: gitVersion,
            hash: gitCommitHash
          }, null, 4);
      }
    }])
  ],

  optimization: {
    splitChunks: {
      chunks: 'all',
      minSize: 30000,
      maxSize: 0,
      cacheGroups: {
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          priority: -10
        },
        default: {
          minChunks: 2,
          priority: -20,
          reuseExistingChunk: true
        }
      }
    },
    runtimeChunk: {
      name: entrypoint => `runtime~${entrypoint.name}`
    },
    mangleWasmImports: true,
    removeAvailableModules: true,
    removeEmptyChunks: true,
    mergeDuplicateChunks: true
  },

  devServer: {
    compress: true,
    host: 'localhost',
    https: false,
    open: true,
    overlay: true,
    port: 9000,
    historyApiFallback: true
  }

});