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Rollup

JavaScript module bundler built for libraries

Overview

What Rollup does

Rollup is a JavaScript module bundler that compiles small pieces of code into larger bundles. It made its name on tree shaking — eliminating unused exports — and on producing notably clean, readable output, which is why it became the default choice for publishing libraries rather than applications. The division of labour has held: applications tend to use Vite or webpack, libraries tend to use Rollup. Vite itself uses Rollup for production builds, so a great deal of code passes through it indirectly.

What people use it for

  • Publishing a JavaScript library in several module formats
  • Builds where output size and cleanliness matter more than build speed
  • Producing ES module output for consumers who will bundle it themselves

The honest half

Where it falls short

Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about Rollup.

  • Slower than the Go and Rust bundlers that followed it, since it is written in JavaScript
  • Application concerns like dev servers and hot reloading are not its job, so app builds need Vite on top
  • Configuration for non-trivial applications gets verbose compared with tools that assume more

Cross-shopped

What people choose instead of Rollup

Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.

  • Rollup logo
    Rollup
    vs
    Vite logo
    Vite

    Vite: Built on Rollup, and the usual choice for applications rather than libraries

  • Rollup logo
    Rollup
    vs
    esbuild logo
    esbuild

    esbuild: Far faster, at the cost of a narrower plugin API and less refined output

Pricing

What Rollup costs

Taken from the vendor's own pricing page. Prices move, so check before you buy.

Rollup

Free

  • Full functionality
  • Commercial use permitted
  • Community support

Capabilities

Features

  • Tree shaking

    Eliminates unused exports, producing genuinely minimal bundles

  • Clean output

    Generated code stays readable, which matters for published packages

  • Multiple output formats

    ESM, CommonJS, UMD and IIFE from one build

  • Plugin API

    A well-established plugin ecosystem shared with Vite

Answered, with sources

Questions people ask

Each answer names the page it came from, so you can check it rather than take our word for it.

Is Rollup free?

Yes, open source under the MIT licence.

Rollup or webpack?

Rollup is the usual choice for libraries thanks to cleaner output and better tree shaking. webpack remains stronger for complex applications with heavy asset handling.

Do I need Rollup if I use Vite?

Not directly. Vite uses Rollup for production builds, so you already benefit from it.

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Softwr does not host reviews and shows no star rating for Rollup, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.

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