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wtf is rollup?

yyx990803/rollup — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2017-06-14

★ 6JavaScriptAudience · developerComplexity · 2/5DormantSetup · easy

TL;DR

Rollup bundles JavaScript files written with ES6 modules into a single optimized file, stripping unused code via tree shaking for smaller, faster output.

Mindmap

mindmap
  root((rollup))
    What it does
      Bundles JS modules
      Tree shaking
      Converts module formats
    Tech stack
      JavaScript
      ES6 modules
    Use cases
      Ship library bundles
      Build web apps
      Reduce bundle size
    Audience
      Library authors
      Frontend developers
    Output formats
      IIFE
      CommonJS
      UMD

Code map

Detail Auto

An interactive map of this repo's files and how they connect — its source is parsed live in your browser. Click Visualize to build it.

filefunction / class

Why would anyone build with this?

REASON 1

Bundle a modular JavaScript library into a single browser-ready file.

REASON 2

Strip unused imported code from a bundle using tree shaking.

REASON 3

Output a package in CommonJS format for Node.js or UMD for universal compatibility.

REASON 4

Publish a smaller, faster-loading web app by removing dead code.

What's in the stack?

JavaScript

How it stacks up

yyx990803/rolluparthurmoorgan/driftatom/etch-list-view
Stars666
LanguageJavaScriptJavaScriptJavaScript
Last pushed2017-06-14—2020-04-28
MaintenanceDormant—Dormant
Setup difficultyeasymoderatemoderate
Complexity2/52/52/5
Audiencedevelopergeneraldeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 30min

Basic use is a single CLI command, custom output formats need a config file.

The README does not specify license details.

Yoink these prompts

Prompt 1
Use Rollup to bundle my main.js entry file into a single IIFE bundle for the browser.
Prompt 2
Show me a Rollup command that outputs both CommonJS and UMD formats from the same entry file.
Prompt 3
Explain how Rollup's tree shaking removes unused exports from my bundle.
Prompt 4
Set up a Rollup config file for bundling a JavaScript library I plan to publish to npm.

Frequently asked questions

wtf is rollup?

Rollup bundles JavaScript files written with ES6 modules into a single optimized file, stripping unused code via tree shaking for smaller, faster output.

What language is rollup written in?

Mainly JavaScript. The stack also includes JavaScript.

Is rollup actively maintained?

Dormant — no commits in 2+ years (last push 2017-06-14).

What license does rollup use?

The README does not specify license details.

How hard is rollup to set up?

Setup difficulty is rated easy, with roughly 30min to a first successful run.

Who is rollup for?

Mainly developer.

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