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Webpack

Bundler de modulos JavaScript - code splitting, loaders, plugins para pipelines de build complejos

TL;DR

Qué: Un empaquetador de módulos estáticos para aplicaciones JavaScript modernas.

Por qué: Empaquetar assets, transformar código, optimizar builds, extenso ecosistema de plugins.

Quick Start

Instalar:

npm init -y
npm install webpack webpack-cli --save-dev

Crear archivos:

src/index.js:

import { greeting } from './greeting.js';
console.log(greeting('World'));

src/greeting.js:

export function greeting(name) {
  return `Hello, ${name}!`;
}

Build:

npx webpack

La salida estará en dist/main.js

Cheatsheet

ComandoDescripción
npx webpackBuild (producción)
npx webpack --mode developmentBuild (desarrollo)
npx webpack serveServidor de dev
npx webpack --watchModo watch

Configuración básica (webpack.config.js):

const path = require('path');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },
  mode: 'development',
};

Gotchas

Loaders for non-JS files

module.exports = {
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.(png|jpg|gif)$/,
        type: 'asset/resource',
      },
    ],
  },
};

Dev server

npm install webpack-dev-server --save-dev
module.exports = {
  devServer: {
    static: './dist',
    hot: true,
    port: 3000,
  },
};

HTML plugin

npm install html-webpack-plugin --save-dev
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
    }),
  ],
};

Next Steps