How do I install the Bun License skill?

Run npx skillmds@latest add jarle/bun-license in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Bun License skill do?

License for Bun It is listed under Coding & Dev Tools on SkillMD.

Is Bun License safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Bun License?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Bun License free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Bun License?

jarle (@jarle) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Bun License by jarle — Agent Skill

Name: Bun License
Author: jarle

File contents

License

License for Bun

Bun itself is MIT-licensed.

JavaScriptCore

Bun statically links JavaScriptCore (and WebKit) which is LGPL-2 licensed. WebCore files from WebKit are also licensed under LGPL2. Per LGPL2:

(1) If you statically link against an LGPL'd library, you must also provide your application in an object (not necessarily source) format, so that a user has the opportunity to modify the library and relink the application.

You can find the patched version of WebKit used by Bun here: https://github.com/oven-sh/webkit. If you would like to relink Bun with changes:

git submodule update --init --recursive
make jsc
zig build

This compiles JavaScriptCore, compiles Bun's .cpp bindings for JavaScriptCore (which are the object files using JavaScriptCore) and outputs a new bun binary with your changes.

Linked libraries

Bun statically links these libraries:

Library	License
`boringssl`	several licenses
`brotli`	MIT
`libarchive`	several licenses
`lol-html`	BSD 3-Clause
`mimalloc`	MIT
`picohttp`	dual-licensed under the Perl License or the MIT License
`zstd`	dual-licensed under the BSD License or GPLv2 license
`simdutf`	Apache 2.0
`tinycc`	LGPL v2.1
`uSockets`	Apache 2.0
`zlib-cloudflare`	zlib
`c-ares`	MIT licensed
`libicu` 72	license here
`libbase64`	BSD 2-Clause
`libuv` (on Windows)	MIT
`libdeflate`	MIT
A fork of `uWebsockets`	Apache 2.0 licensed
Parts of Tigerbeetle's IO code	Apache 2.0 licensed

Polyfills

For compatibility reasons, the following packages are embedded into Bun's binary and injected if imported.

Package	License
`assert`	MIT
`browserify-zlib`	MIT
`buffer`	MIT
`constants-browserify`	MIT
`crypto-browserify`	MIT
`domain-browser`	MIT
`events`	MIT
`https-browserify`	MIT
`os-browserify`	MIT
`path-browserify`	MIT
`process`	MIT
`punycode`	MIT
`querystring-es3`	MIT
`stream-browserify`	MIT
`stream-http`	MIT
`string_decoder`	MIT
`timers-browserify`	MIT
`tty-browserify`	MIT
`url`	MIT
`util`	MIT
`vm-browserify`	MIT

Additional credits

Bun's JS transpiler, CSS lexer, and Node.js module resolver source code is a Zig port of @evanw’s esbuild project.
Credit to @kipply for the name "Bun"!

---name: bun-licensedescription: License for Bun---# License> License for BunBun itself is MIT-licensed.## JavaScriptCoreBun statically links JavaScriptCore (and WebKit) which is LGPL-2 licensed. WebCore files from WebKit are also licensed under LGPL2. Per LGPL2:> (1) If you statically link against an LGPL'd library, you must also provide your application in an object (not necessarily source) format, so that a user has the opportunity to modify the library and relink the application.You can find the patched version of WebKit used by Bun here: [https://github.com/oven-sh/webkit](https://github.com/oven-sh/webkit). If you would like to relink Bun with changes:* `git submodule update --init --recursive`* `make jsc`* `zig build`This compiles JavaScriptCore, compiles Bun's `.cpp` bindings for JavaScriptCore (which are the object files using JavaScriptCore) and outputs a new `bun` binary with your changes.## Linked librariesBun statically links these libraries:| Library | License || ------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------- || [`boringssl`](https://boringssl.googlesource.com/boringssl/) | [several licenses](https://boringssl.googlesource.com/boringssl/+/refs/heads/master/LICENSE) || [`brotli`](https://github.com/google/brotli) | MIT || [`libarchive`](https://github.com/libarchive/libarchive) | [several licenses](https://github.com/libarchive/libarchive/blob/master/COPYING) || [`lol-html`](https://github.com/cloudflare/lol-html/tree/master/c-api) | BSD 3-Clause || [`mimalloc`](https://github.com/microsoft/mimalloc) | MIT || [`picohttp`](https://github.com/h2o/picohttpparser) | dual-licensed under the Perl License or the MIT License || [`zstd`](https://github.com/facebook/zstd) | dual-licensed under the BSD License or GPLv2 license || [`simdutf`](https://github.com/simdutf/simdutf) | Apache 2.0 || [`tinycc`](https://github.com/tinycc/tinycc) | LGPL v2.1 || [`uSockets`](https://github.com/uNetworking/uSockets) | Apache 2.0 || [`zlib-cloudflare`](https://github.com/cloudflare/zlib) | zlib || [`c-ares`](https://github.com/c-ares/c-ares) | MIT licensed || [`libicu`](https://github.com/unicode-org/icu) 72 | [license here](https://github.com/unicode-org/icu/blob/main/icu4c/LICENSE) || [`libbase64`](https://github.com/aklomp/base64/blob/master/LICENSE) | BSD 2-Clause || [`libuv`](https://github.com/libuv/libuv) (on Windows) | MIT || [`libdeflate`](https://github.com/ebiggers/libdeflate) | MIT || A fork of [`uWebsockets`](https://github.com/jarred-sumner/uwebsockets) | Apache 2.0 licensed || Parts of [Tigerbeetle's IO code](https://github.com/tigerbeetle/tigerbeetle/blob/532c8b70b9142c17e07737ab6d3da68d7500cbca/src/io/windows.zig#L1) | Apache 2.0 licensed |## PolyfillsFor compatibility reasons, the following packages are embedded into Bun's binary and injected if imported.| Package | License || ------------------------------------------------------------------------ | ------- || [`assert`](https://npmjs.com/package/assert) | MIT || [`browserify-zlib`](https://npmjs.com/package/browserify-zlib) | MIT || [`buffer`](https://npmjs.com/package/buffer) | MIT || [`constants-browserify`](https://npmjs.com/package/constants-browserify) | MIT || [`crypto-browserify`](https://npmjs.com/package/crypto-browserify) | MIT || [`domain-browser`](https://npmjs.com/package/domain-browser) | MIT || [`events`](https://npmjs.com/package/events) | MIT || [`https-browserify`](https://npmjs.com/package/https-browserify) | MIT || [`os-browserify`](https://npmjs.com/package/os-browserify) | MIT || [`path-browserify`](https://npmjs.com/package/path-browserify) | MIT || [`process`](https://npmjs.com/package/process) | MIT || [`punycode`](https://npmjs.com/package/punycode) | MIT || [`querystring-es3`](https://npmjs.com/package/querystring-es3) | MIT || [`stream-browserify`](https://npmjs.com/package/stream-browserify) | MIT || [`stream-http`](https://npmjs.com/package/stream-http) | MIT || [`string_decoder`](https://npmjs.com/package/string_decoder) | MIT || [`timers-browserify`](https://npmjs.com/package/timers-browserify) | MIT || [`tty-browserify`](https://npmjs.com/package/tty-browserify) | MIT || [`url`](https://npmjs.com/package/url) | MIT || [`util`](https://npmjs.com/package/util) | MIT || [`vm-browserify`](https://npmjs.com/package/vm-browserify) | MIT |## Additional credits* Bun's JS transpiler, CSS lexer, and Node.js module resolver source code is a Zig port of [@evanw](https://github.com/evanw)’s [esbuild](https://github.com/evanw/esbuild) project.* Credit to [@kipply](https://github.com/kipply) for the name "Bun"!

Frequently asked questions

Bun License