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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-ng zlib
c-ares MIT licensed
libicu 72 license here
libbase64 BSD 2-Clause
libuv (on Windows) MIT
libdeflate MIT
uucode MIT
A fork of uWebsockets Apache 2.0 licensed
Parts of Tigerbeetle's IO code Apache 2.0 licensed
__cxa_thread_atexit fallback from LLVM libc++abi Apache 2.0 with LLVM exception

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"!