Bun v0.2.1

To upgrade: ```bash bun upgrade ``` To install: ```bash curl https://bun.sh/install | bash ``` <details> <summary>If you have any problems upgrading</summary> Run the install script (you can run it multiple times): ```bash curl https://bun.sh/install | bash ``` </details> ## WebSocket server `Bun.serve()` now has builtin support for websockets on the server ```ts Bun.serve({ websocket: { message(ws, message) { ws.send(message); }, }, fetch(req, server) { // Upgrade to a ServerWebSocket if we can // This automatically checks for the `Sec-WebSocket-Key` header // meaning you don't have to check headers, you can just call `upgrade()` if (server.upgrade(req)) // When upgrading, we return undefined since we don't want to send a Response return; return new Response("Regular HTTP response"); }, }); ``` For more information about using websockets with `Bun.serve()`, [see the readme](https://github.com/oven-sh/bun#websockets-with-bunserve) For a chat room on Linux: <img width="440" alt="image" src="https://user-images.githubusercontent.com/709451/196610254-5d49703a-ddc3-4010-82be-1e99d24d4123.png"> To reproduce this benchmark on your own computer, [go here](https://github.com/oven-sh/bun/tree/main/bench/websocket-server) Bun's server-side websockets are powered by [uWebSockets](https://github.com/uNetworking/uWebSockets). ## RegExp lookbehinds assertions fix To address #314, Bun now includes a fallback RegExp implementation that uses the [Oniguruma](https://github.com/kkos/oniguruma) regex engine. Thanks to @dylan-conway! RegExp lookbehind assertions are used by popular npm packages like Discord.js When a RegExp literal with a lookbehind is used inside Bun's runtime, Bun's transpiler now automatically replaces it with a `Bun.OnigurumaRegExp`. This API isn't intended to be used outside of the transpiler and will be removed once [JavaScriptCore lands native support](https://bugs.webkit.org/show_bug.cgi?id=174931). When run inside Bun's JavaScript runtime, this input: ```js export default /\d+(?=%)/; ``` Transpiles to: ```js export default (new globalThis.Bun.OnigurumaRegExp("\\d+(?=%)")); ``` The RegExp polyfill is largely based on JavaScriptCore's own `JSC::RegExp` bindings. ## More stuff - Send a `Date` header in HTTP responses - [`performance.timeOrigin`]() has been implemented - `process.argv` was returning an empty array when bun started without arguments other than the script, like `bun foo.js` (thanks to @dylan-conway for the fix) - [Fix a crash when BodyMixin functions throw](https://github.com/oven-sh/bun/commit/3482d761758368c74d4971f75606af5657aff53c) - [Fix a memory leak in HTTP server related to promises](https://github.com/oven-sh/bun/commit/b1e97edc59628a1ae5ae02547947722ca96761c3) - Fix a regression from v0.2.0 where small buffered (non-streaming) HTTP response bodies would sometimes include invalid data due to a memory aliasing bug - Fix a bug where a pong control frame in bun's `WebSocket` client would sometimes put the `WebSocket` in an error state https://github.com/oven-sh/bun/commit/c6fe82018aeda88a3337a5355313de7db68ef827 - Fix a bug where a `WebSocket` client would not keep the process open - #1335 - More test coverage for bun's client-side `WebSocket` implementation due to adding server-side WebSockets - Added DOMJIT function call support to Bun's JavaScriptCore bindings generator (used by the new `ServerWebSocket` object for `publishText`, `publishBinary`, `sendText` and `sendBinary` functions) **Full Changelog**: https://github.com/oven-sh/bun/compare/bun-v0.2.0...bun-v0.2.1