ncc
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| Fact | ncc | Rolldown |
|---|---|---|
| License | The repository lists an MIT license. | Rolldown is free and open source; VoidZero states that it remains open source and MIT-licensed. |
| Module formats | When building an `.mjs` file or a `.js` file inside a `type: module` package boundary, ncc automatically creates ES module output. | Rolldown supports mixed ESM and CommonJS module graphs without requiring @rollup/plugin-commonjs. |
| Purpose | ncc is a CLI that compiles a Node.js module and its dependencies into a single file. | Rolldown is a Rust-based bundler for JavaScript with a Rollup-compatible API and esbuild feature parity. |
ncc suits Node.js developers who want to package a module and its dependencies into one file, including for npm publishing or serverless environments. It also offers a programmatic interface for Node.js projects.
Rolldown suits JavaScript developers looking for a bundler with TypeScript and JSX transforms and a Rollup-compatible plugin API. Its guidance points most application developers toward using it through Vite and library authors toward tsdown.