Webpack Module Bundling

Last updated: 2025-09-25 12:47:03

Webpack Configuration

Webpack is a powerful module bundler for modern JavaScript applications. Learn to configure and optimize your build process.

Basic Configuration

// webpack.config.js
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: '[name].[contenthash].js',
    path: path.resolve(__dirname, 'dist'),
    clean: true,
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react']
          }
        }
      },
      {
        test: /\.css$/i,
        use: [MiniCssExtractPlugin.loader, 'css-loader'],
      },
      {
        test: /\.(png|svg|jpg|jpeg|gif)$/i,
        type: 'asset/resource',
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
    }),
    new MiniCssExtractPlugin({
      filename: '[name].[contenthash].css',
    }),
  ],
};

Development vs Production

// webpack.dev.js
const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');

module.exports = merge(common, {
  mode: 'development',
  devtool: 'inline-source-map',
  devServer: {
    contentBase: './dist',
    hot: true,
    port: 3000,
  },
});

// webpack.prod.js
const { merge } = require('webpack-merge');
const common = require('./webpack.common.js');
const TerserPlugin = require('terser-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');

module.exports = merge(common, {
  mode: 'production',
  optimization: {
    minimizer: [
      new TerserPlugin(),
      new OptimizeCSSAssetsPlugin()
    ],
    splitChunks: {
      chunks: 'all',
    },
  },
});

Package.json Scripts

{
  "scripts": {
    "start": "webpack serve --config webpack.dev.js",
    "build": "webpack --config webpack.prod.js",
    "analyze": "webpack-bundle-analyzer dist/main.js"
  }
}