webpack.config.js

const path = require('path');
const webpack = require('webpack');

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

const DEVELOPMENT = 'development';
const PRODUCTION = 'production';

const mode = process.env.NODE_ENV || DEVELOPMENT;

const appBuild = path.resolve(__dirname, 'build');
const appSrc = path.resolve(__dirname, 'src');
const appIndex = path.resolve(__dirname, 'src', 'index.tsx');
const appHtml = path.resolve(__dirname, 'public', 'index.html');

module.exports = {
  mode,
  entry: appIndex,
  output: {
    path: appBuild,
    filename: mode === PRODUCTION
      ? 'static/js/[name].[contenthash:8].js'
      : mode === DEVELOPMENT && 'static/js/bundle.js',
    publicPath: '/',
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        exclude: /node_modules/,
        use: 'babel-loader',
        include: appSrc,
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.jsx', '.ts', '.tsx'],
  },
  devServer: {
    static: {
      directory: path.join(__dirname, 'public'),
    },
    client: {
      overlay: true,
    },
    historyApiFallback: {
      index: '/index.html',
    },
    hot: true,
    compress: true,
  },
  plugins: [
    new Dotenv(),
    new webpack.BannerPlugin({
      banner: `
        Build Date: ${new Date().toLocaleString()}
        Author: Seungmin Sa
        Author-Email: dbd02169@naver.com
      `,
    }),
    new HtmlWebpackPlugin({
      template: appHtml,
      templateParameters: {
        env: mode === DEVELOPMENT ? '(개발용)' : '',
      },
      minify: mode === PRODUCTION ? {
        collapseWhitespace: true,
        removeComments: true,
      } : false,
    }),
  ],
};