🚀 Blazing fast bundle times
Parcel uses worker processes to enable multicore compilation, and has a filesystem cache for fast rebuilds even after a restart.
📦 Bundle all your assets
Parcel has out of the box support for JS, CSS, HTML, file assets, and more - no plugins needed.
🐠 Automatic transforms
Code is automatically transformed using Babel, PostCSS, and PostHTML when needed - even
node_modules
.
✂️ Zero config code splitting
Using the dynamic import()
syntax, Parcel splits your output bundles so you only load what is
needed on initial load.
🔥 Hot module replacement
Parcel automatically updates modules in the browser as you make changes during development, no configuration needed.
🚨 Friendly error logging
Parcel prints syntax highlighted code frames when it encounters errors to help you pinpoint the problem.
Hello World
Start with the entry HTML file for your application. Parcel follows the dependencies from there to build your whole app.
✏️ index.html
<html>
<body>
<script src="./index.js"></script>
</body>
</html>
🛠 index.js
// import another component
import main from './main';
main();
🛠 main.js
// import a CSS module
import classes from './main.css';
export default () => {
console.log(classes.main);
};
💅 main.css
.main {
/* Reference an image file */
background: url('./images/background.png');
color: red;
}
Run parcel index.html
to start a dev server. Importing JavaScript, CSS, images, and more just
works! 👍
Benchmarks
Bundler | Time |
---|---|
browserify | 22.98s |
webpack | 20.71s |
parcel | 9.98s |
parcel - with cache | 2.64s |
Based on a reasonably sized app, containing 1726 modules, 6.5M uncompressed. Built on a 2016 MacBook Pro with 4 physical cores.