webpack.config.js

'use strict';

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

const config = {
  entry: ['react-hot-loader/patch', './src/index.tsx'],
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].[contenthash].js'
  },
  devServer: {
    contentBase: './dist'
  },
  module: {
    rules: [
      {
        test: /\.html$/,
        loader: 'html-loader'
      },
      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1
            }
          },
          'postcss-loader'
        ]
      },
      {
        test: /\.ts(x)?$/,
        loader: 'ts-loader',
        exclude: /node_modules/
      },
      {
        test: /\.png$/,
        use: [
          {
            loader: 'url-loader',
            options: {
              mimetype: 'image/png'
            }
          }
        ]
      },
      {
        test: /\.svg$/,
        use: 'file-loader'
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: 'src/template.html'
    })
  ],
  resolve: {
    extensions: ['.tsx', '.ts', '.js'],
    alias: {
      'react-dom': '@hot-loader/react-dom'
    }
  },
  optimization: {
    runtimeChunk: 'single',
    splitChunks: {
      cacheGroups: {
        vendor: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
          chunks: 'all'
        }
      }
    }
  }
};

module.exports = (env, argv) => {
  if (argv.hot) {
    // Cannot use 'contenthash' when hot reloading is enabled.
    config.output.filename = '[name].[hash].js';
  }

  return config;
};