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parcel-bundler logoparcel

The zero configuration build tool for the web. 📦🚀

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A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Through "loaders", modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.

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Next-generation ES module bundler

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Build system optimized for JavaScript and TypeScript, written in Rust

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Quick Overview

Parcel is a zero-configuration web application bundler that offers blazing fast performance and an exceptional developer experience. It supports various file types out of the box and automatically transforms and bundles your code, making it ready for production with minimal effort.

Pros

  • Zero configuration required for most projects
  • Incredibly fast build times due to multicore processing
  • Automatic code splitting and hot module replacement
  • Built-in support for numerous file types and transformations

Cons

  • Less flexible than some other bundlers for complex configurations
  • May produce larger bundle sizes compared to manually optimized builds
  • Limited plugin ecosystem compared to more established bundlers
  • Some advanced features may require additional configuration

Code Examples

  1. Basic HTML entry point:
<!-- index.html -->
<html>
  <body>
    <script src="./index.js"></script>
  </body>
</html>
  1. JavaScript module with import:
// index.js
import { greeting } from './greeting';

console.log(greeting('World'));
  1. CSS import in JavaScript:
// app.js
import './styles.css';

document.body.innerHTML = '<h1>Hello, Parcel!</h1>';

Getting Started

  1. Install Parcel globally:

    npm install -g parcel-bundler
    
  2. Create a project directory and navigate to it:

    mkdir my-parcel-project && cd my-parcel-project
    
  3. Create an index.html file with a script tag pointing to your entry JavaScript file:

    <html>
      <body>
        <script src="./index.js"></script>
      </body>
    </html>
    
  4. Create an index.js file with some basic code:

    console.log('Hello, Parcel!');
    
  5. Run Parcel:

    parcel index.html
    

Parcel will start a development server and provide a URL to view your application. It will automatically bundle and update your code as you make changes.

Competitor Comparisons

64,559

A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Through "loaders", modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.

Pros of webpack

  • Highly configurable and flexible, allowing for complex build setups
  • Large ecosystem of plugins and loaders
  • Better performance for large-scale applications

Cons of webpack

  • Steeper learning curve and more complex configuration
  • Slower build times for smaller projects
  • Requires more boilerplate code to get started

Code Comparison

webpack configuration:

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },
  module: {
    rules: [
      { test: /\.js$/, use: 'babel-loader' },
    ],
  },
};

Parcel requires no configuration by default:

// No configuration needed

webpack and Parcel are both popular bundlers for JavaScript applications. webpack offers more control and customization, making it suitable for complex projects with specific requirements. It has a vast ecosystem of plugins and loaders, allowing developers to tailor the build process to their needs.

On the other hand, Parcel focuses on simplicity and ease of use. It requires zero configuration to get started, making it ideal for smaller projects or rapid prototyping. Parcel automatically handles many common tasks without explicit configuration, such as transpiling, minification, and code splitting.

While webpack excels in performance for large-scale applications, Parcel generally offers faster build times for smaller projects. The choice between the two often depends on the project's complexity, team expertise, and specific requirements.

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Next-generation ES module bundler

Pros of Rollup

  • Better tree-shaking capabilities, resulting in smaller bundle sizes
  • More flexible plugin system, allowing for greater customization
  • Excellent for creating libraries and frameworks

Cons of Rollup

  • Steeper learning curve, especially for beginners
  • Less out-of-the-box functionality compared to Parcel
  • May require more configuration for complex projects

Code Comparison

Rollup configuration:

// rollup.config.js
export default {
  input: 'src/main.js',
  output: {
    file: 'bundle.js',
    format: 'cjs'
  }
};

Parcel usage (no configuration required):

parcel build src/index.html

Rollup excels in creating optimized bundles for libraries and frameworks, offering powerful tree-shaking and a flexible plugin system. However, it requires more configuration and has a steeper learning curve. Parcel, on the other hand, provides a simpler, zero-config approach that's great for quick prototyping and smaller projects. While Parcel offers more out-of-the-box functionality, Rollup's customization options make it a preferred choice for more complex build requirements.

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Next generation frontend tooling. It's fast!

Pros of Vite

  • Faster development server startup and hot module replacement (HMR)
  • Native ES modules support, reducing bundle size and improving performance
  • Better TypeScript integration with built-in support

Cons of Vite

  • Smaller ecosystem and community compared to Parcel
  • Less out-of-the-box support for various file types and assets
  • Steeper learning curve for developers new to ES modules

Code Comparison

Vite configuration:

// vite.config.js
export default {
  plugins: [],
  build: {
    outDir: 'dist',
  }
}

Parcel configuration:

// No configuration file needed for basic usage
// Command: parcel src/index.html

Vite offers more granular control over the build process, while Parcel aims for zero-configuration setups. Vite's approach may be preferred for larger projects or those requiring specific optimizations, whereas Parcel's simplicity can be advantageous for smaller projects or rapid prototyping.

Both tools have their strengths, and the choice between them often depends on project requirements, team expertise, and development workflow preferences.

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Build system optimized for JavaScript and TypeScript, written in Rust

Pros of Turborepo

  • Optimized for monorepo management and task orchestration
  • Intelligent caching system for faster builds and deployments
  • Seamless integration with other Vercel tools and services

Cons of Turborepo

  • Steeper learning curve for smaller projects or single-package repositories
  • Less focus on asset bundling and optimization compared to Parcel

Code Comparison

Turborepo (turborepo.json):

{
  "pipeline": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", ".next/**"]
    },
    "test": {
      "dependsOn": ["build"],
      "outputs": []
    }
  }
}

Parcel (package.json):

{
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build index.html"
  },
  "devDependencies": {
    "parcel": "^2.0.0"
  }
}

Summary

Turborepo excels in managing complex monorepo setups with its powerful task orchestration and caching capabilities. It integrates well with Vercel's ecosystem but may be overkill for simpler projects. Parcel, on the other hand, focuses on simplifying asset bundling and provides an easy-to-use solution for smaller projects or single-package repositories. The choice between the two depends on the project's complexity and specific requirements.

19,481

ESM-powered frontend build tool. Instant, lightweight, unbundled development. ✌️

Pros of Snowpack

  • Faster development builds due to no-bundle approach
  • Built-in support for modern web technologies like ES modules
  • Simpler configuration and less boilerplate code required

Cons of Snowpack

  • Potentially larger production builds without optimization
  • Less mature ecosystem compared to Parcel
  • May require additional plugins for certain features

Code Comparison

Snowpack configuration:

// snowpack.config.js
module.exports = {
  mount: {
    public: '/',
    src: '/dist',
  },
};

Parcel configuration:

// package.json
{
  "source": "src/index.html",
  "scripts": {
    "start": "parcel",
    "build": "parcel build"
  }
}

Both Snowpack and Parcel aim to simplify the build process for web applications, but they take different approaches. Snowpack focuses on leveraging native ES modules and providing a faster development experience, while Parcel emphasizes zero-configuration and out-of-the-box support for various file types.

Snowpack's no-bundle approach during development can lead to faster builds and hot module replacement, making it particularly suitable for modern web applications. However, Parcel's more established ecosystem and broader asset support may be advantageous for projects with diverse requirements or legacy dependencies.

Ultimately, the choice between Snowpack and Parcel depends on the specific needs of your project, development workflow preferences, and the importance of factors like build speed, configuration simplicity, and ecosystem maturity.

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README

Parcel

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Parcel is a zero configuration build tool for the web. It combines a great out-of-the-box development experience with a scalable architecture that can take your project from just getting started to massive production application.

Features

  • 😍 Zero config – Parcel supports many languages and file types out of the box, from web technologies like HTML, CSS, and JavaScript, to assets like images, fonts, videos, and more. It has a built-in dev server with hot reloading, beautiful error diagnostics, and much more. No configuration needed!
  • ⚡️ Lightning fast – Parcel's JavaScript compiler is written in Rust for native performance. Your code is built in parallel using worker threads, utilizing all of the cores on your machine. Everything is cached, so you never build the same code twice. It's like using watch mode, but even when you restart Parcel!
  • 🚀 Automatic production optimization – Parcel optimizes your whole app for production automatically. This includes tree-shaking and minifying your JavaScript, CSS, and HTML, resizing and optimizing images, content hashing, automatic code splitting, and much more.
  • 🎯 Ship for any target – Parcel automatically transforms your code for your target environments. From modern and legacy browser support, to zero config JSX and TypeScript compilation, Parcel makes it easy to build for any target – or many!
  • 🌍 Scalable – Parcel requires zero configuration to get started. But as your application grows and your build requirements become more complex, it's possible to extend Parcel in just about every way. A simple configuration format and powerful plugin system that's designed from the ground up for performance means Parcel can support projects of any size.

Getting Started

See the following guides in our documentation on how to get started with Parcel.

Documentation

Read the docs at https://parceljs.org/docs/.

Community

Contributors

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