The MIT License (MIT)
Copyright (c) 2024 Yaroslav Markin
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
Bun is licensed under the MIT License (https://github.com/oven-sh/bun/blob/main/LICENSE.md)
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`](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 |
## Polyfills
For 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"!
Copyright (c) 2024 Yaroslav Markin
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
Bun is licensed under the MIT License (https://github.com/oven-sh/bun/blob/main/LICENSE.md)
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`](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 |
## Polyfills
For 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"!