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rollup

Next-generation ES module bundler


Version published
Weekly downloads
24M
decreased by-3.78%
Maintainers
5
Weekly downloads
 
Created

What is rollup?

Rollup is a module bundler for JavaScript which compiles small pieces of code into something larger and more complex, such as a library or application. It is optimized for bundling JavaScript files to use in a browser, and it is also capable of transforming code using plugins.

What are rollup's main functionalities?

Bundling Modules

Rollup can bundle multiple JavaScript modules into a single file. The above code demonstrates how to create a bundle from an entry point file 'src/main.js' and output it as an immediately-invoked function expression (IIFE) to 'bundle.js'.

import rollup from 'rollup';

async function build() {
  const bundle = await rollup.rollup({
    input: 'src/main.js'
  });

  await bundle.write({
    file: 'bundle.js',
    format: 'iife',
    name: 'MyModule'
  });
}

build();

Tree-shaking

Rollup includes a feature called 'tree-shaking' which removes unused code from the final bundle. This helps in reducing the size of the bundle and improving load times.

import { rollup } from 'rollup';

rollup({
  input: 'src/index.js',
  treeshake: true // Tree-shaking is enabled by default
}).then(bundle => {
  // Code to write the bundle
});

Plugin System

Rollup supports a wide range of plugins that can transform the code, add functionality, or integrate with other build tools. The code sample shows how to use the JSON plugin to import JSON files as modules.

import { rollup } from 'rollup';
import json from '@rollup/plugin-json';

rollup({
  input: 'src/index.js',
  plugins: [json()]
}).then(bundle => {
  // Code to write the bundle
});

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Package last updated on 22 Sep 2022

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