# 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 uses the standardized ES Module format for code, instead of previous idiosyncratic solutions such as CommonJS and AMD.

## Getting Started

- [Introduction](https://rollupjs.org/introduction/): What Rollup is, why it exists, and quick start instructions
- [Tutorial](https://rollupjs.org/tutorial/): Step-by-step walkthrough of bundling with Rollup
- [Command Line Interface](https://rollupjs.org/command-line-interface/): CLI usage, flags, and config file options
- [JavaScript API](https://rollupjs.org/javascript-api/): Programmatic usage via `rollup.rollup()` and `bundle.generate()`/`bundle.write()`

## Core Concepts

- [Configuration Options](https://rollupjs.org/configuration-options/): Full reference for `rollup.config.js` (input, output, plugins, treeshake, etc.)
- [Plugin Development](https://rollupjs.org/plugin-development/): How to write Rollup plugins, plugin hooks, and the build/output/watch phases
- [ES Module Syntax](https://rollupjs.org/es-module-syntax/): Supported import/export syntax and how Rollup interprets it

## Guides

- [Running Rollup in a Browser](https://rollupjs.org/browser/): Using Rollup's browser build to bundle in-browser
- [Migrating to Rollup 4](https://rollupjs.org/migration/): Breaking changes and upgrade steps from Rollup 3 to 4
- [Troubleshooting](https://rollupjs.org/troubleshooting/): Common errors and how to resolve them
- [Frequently Asked Questions](https://rollupjs.org/faqs/): Answers to common questions about Rollup's behavior and design

## Optional

- [Other Tools](https://rollupjs.org/tools/): Companion tools and ecosystem projects that work with Rollup
- [REPL](https://rollupjs.org/repl/): Interactive in-browser playground for trying Rollup configs