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webpack

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

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What is webpack?

Webpack is a powerful module bundler for JavaScript applications. It processes applications by internally building a dependency graph which maps every module your project needs and generates one or more bundles. It is highly extensible via loaders and plugins, and it's designed to manage, transform, and bundle frontend assets like JavaScript, CSS, and images.

What are webpack's main functionalities?

Module Bundling

Webpack bundles all the JavaScript files and other assets like CSS and images into a single output file. The code sample shows a basic webpack configuration defining an entry point and the output bundle.

module.exports = {
  entry: './path/to/my/entry/file.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'my-first-webpack.bundle.js'
  }
};

Loaders

Loaders allow webpack to process different types of files and convert them into modules that can be included in your bundle. The code sample demonstrates how to use loaders to handle .txt and .css files.

module.exports = {
  module: {
    rules: [
      { test: /\.txt$/, use: 'raw-loader' },
      { test: /\.css$/, use: ['style-loader', 'css-loader'] }
    ]
  }
};

Plugins

Plugins can be leveraged to perform a wider range of tasks like bundle optimization, asset management, and environment variable injection. The code sample shows how to use the HtmlWebpackPlugin to generate an index.html file with the bundled assets injected.

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

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

Development Server

Webpack provides a development server that can be used to serve your application during development. It supports live reloading. The code sample configures the webpack development server to serve files from the 'dist' directory.

module.exports = {
  devServer: {
    contentBase: './dist',
    open: true
  }
};

Code Splitting

Code splitting allows you to split your code into various bundles which can then be loaded on demand or in parallel. The code sample shows how to split the application and vendor code into separate bundles.

module.exports = {
  entry: {
    app: './src/app.js',
    vendor: './src/vendor.js'
  },
  output: {
    filename: '[name].bundle.js',
    path: __dirname + '/dist'
  }
};

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Package last updated on 05 Dec 2024

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