webpack.config.js

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

module.exports = {
  entry: './src/index.tsx',
  mode: process.env.NODE_ENV === 'production' ? 'production' : 'development',

  // Enable sourcemaps for debugging webpack's output.
  devtool: 'source-map',

  resolve: {
    // Add '.ts' and '.tsx' as resolvable extensions.
    extensions: ['.ts', '.tsx', '.js'],
    plugins: [new TsConfigPathsPlugin()],
  },

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

  module: {
    rules: [
      {
        test: /\.ts(x?)$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'ts-loader',
          },
        ],
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      // All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
      {
        enforce: 'pre',
        test: /\.js$/,
        loader: 'source-map-loader',
      },
    ],
  },

  devServer: {
    contentBase: path.join(__dirname, 'dist'),
    compress: true,
    historyApiFallback: true,
    hot: true,
    port: 3001,
    host: 'localhost',
    open: true,
    onListening: server => {
      const port = server.listeningApp.address().port;
      console.log(
        '********************************************************************',
      );
      console.log('* Listening on port:', port);
      console.log(
        '* Please wait, so your browser open "http://localhost:3001/products"',
      );
      console.log(
        '********************************************************************',
      );
    },
    openPage: 'products',
  },

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

  // When importing a module whose path matches one of the following, just
  // assume a corresponding global variable exists and use that instead.
  // This is important because it allows us to avoid bundling all of our
  // dependencies, which allows browsers to cache those libraries between builds.
  externals: {
    // NOTE: 원래 이걸 설정하라고 하지만, 오히려 설정하면 에러가 난다.
    // react: 'React',
    // 'react-dom': 'ReactDOM',
  },
};