{% /raw %} ## `install.linkWorkspacePackages` in bunfig.toml Bun now supports a `linkWorkspacePackages` configuration option that controls workspace package linking behavior. This is particularly useful in CI environments where installing pre-built packages from the registry is faster than building from source. ```toml [install] linkWorkspacePackages = false ``` When set to `false`, Bun installs workspace dependencies from the registry instead of linking them locally. The default value is `true` to maintain backward compatibility. Note that `workspace:*` protocol is still respected even when this option is disabled. Thanks to [@THEjacob1000](https://github.com/THEjacob1000) for the contribution! ## `bun outdated` support for catalog dependencies `bun outdated` now supports catalog dependencies, making it easier to check for updates across a monorepo. ```json#package.json { "name": "my-monorepo", "workspaces": { "packages": ["packages/*"], "catalog": { "react": "^18.0.0", "react-dom": "^18.0.0", "typescript": "^4.0.0" } } } ``` ```json#packages/app/package.json { "name": "app", "dependencies": { "react": "catalog:", "react-dom": "catalog:", "typescript": "catalog:" } } ``` Running `bun outdated` for this workspace package now shows updates available for its catalog dependencies: ```sh $ bun outdated -F app |----------------------------------------| | Package | Current | Update | Latest | |------------|---------|--------|--------| | react | 18.3.1 | 18.3.1 | 19.1.0 | |------------|---------|--------|--------| | react-dom | 18.3.1 | 18.3.1 | 19.1.0 | |------------|---------|--------|--------| | typescript | 4.9.5 | 4.9.5 | 5.8.3 | |----------------------------------------| ``` Thanks to [@juliesaia](https://github.com/juliesaia) for the contribution! ## `Bun.hash.rapidhash` Bun v1.2.16 adds support for rapidhash in `Bun.hash`. ```js const hash = Bun.hash.rapidhash("hello world"); console.log(hash); // 6388527444622164108n ``` Rapidhash shows competitive performance, especially for larger inputs, making it a great choice for non-cryptographic hashing needs. Thanks to [@joelshepherd](https://github.com/joelshepherd) for the contribution! ## Node.js compatibility improvements ### Major `node:net` rework Bun v1.2.16 includes a rework of the `node:net` module, significantly improving Node.js compatibility. Highlights: - Adds 43 new passing Node.js `node:net` tests - `server.maxConnections` - Improves socket connection callback behavior - Fixes TLS upgrade functionality - Correctly recognizes custom methods on extended Socket classes - `socket.localAddress()` and `socket.remoteAddress()` fixed - `node:net` now calls `dns.lookup` similarly to Node.js - `net.BlockList` support for `net.Socket` and `net.Server` Thanks to [@nektro](https://github.com/nektro)! ### `vm.SyntheticModule` support Bun now implements `vm.SyntheticModule`, enabling creation and evaluation of synthetic modules in the VM context. ```js import vm from "node:vm"; const module = new vm.SyntheticModule(["x"], function () { this.setExport("x", 42); }); await module.link(() => {}); await module.evaluate(); console.log(module.namespace.x); // 42 ``` This also includes support for `createCachedData`, `produceCachedData`, and `cachedDataProduced` properties, along with custom inspection for `vm.Module`. Implemented thanks to [@heimskr](https://github.com/heimskr)! ### `HTTPParser` binding Bun v1.2.16 adds `process.binding('http_parser')` (also adding `HTTPParser` to `node:_http_common`), improving compatibility with Node.js HTTP internals. ```js#index.js const { HTTPParser } = process.binding('http_parser'); const parser = new HTTPParser(); parser.initialize(HTTPParser.REQUEST, {}); const input = Buffer.from("GET / HTTP/1.1\r\nHost: example.com\r\n\r\n"); parser[HTTPParser.kOnHeaders] = function () { console.log("Headers!"); }; parser.execute(input); ``` The implementation uses the [`llhttp`](https://github.com/nodejs/llhttp) library for parsing in order to match Node.js behavior exactly. Thanks to [@dylan-conway](https://github.com/dylan-conway)! ### `node:timers/promises` accepts `AbortController` for `options` argument The functions in the `node:timers/promises` module accept an `options` argument which supports several properties, such as `signal` to provide an `AbortSignal` for cancelling the timer. Since `AbortController` objects also have a `signal` property, it should be possible to pass an `AbortController` directly in order to use its signal to cancel the timer: ```js import { setTimeout } from "node:timers/promises"; const controller = new AbortController(); const promise = setTimeout(100, undefined, controller); controller.abort(); promise.catch((e) => console.error(e)); // AbortError ``` Previously, Bun's object validation was too strict and would reject the `AbortController` because it is not a plain object. Now this pattern is supported in Bun. This has fixed compatibility for certain [Cloudflare Wrangler](https://developers.cloudflare.com/workers/wrangler/) subcommands when run in Bun. Thanks to [@SunsetTechuila](https://github.com/SunsetTechuila) for this fix! ## Memory leak fixes This release fixes a few memory leaks: - **N-API handle scopes**: Fixed rare race condition and memory leak in `NapiHandleScopeImpl` where garbage collection wasn't properly cleaning up handle scope implementations - **Bun.spawn stdio**: Fixed memory leak when piped stdio from `Bun.spawn` was never read. ## Bugfixes **Runtime bugfixes**: - Fixed: `bytesWritten` calculation in `node:net` when handling buffered string writes - Fixed: process.stdin buffering issue on macOS where input wasn't being emitted incrementally - Fixed: potential exit signal hanging in loops - Fixed: duplicate Transfer-Encoding header sent in `node:http` in certain cases - Fixed: SharedArrayBuffer crashing on transfer - Fixed: crash when accessing cookies before proper initialization - Fixed: `"undefined is not an object"` error when interrupting Next.js dev server with Ctrl+C - Fixed: DevServer crash when using Tailwind CSS - Fixed: TOML parser incorrectly handling table array headers after inline tables **JavaScript parser bugfixes**: - Fixed: crash with malformed function definitions **CSS parser bugfixes**: - Fixed: CSS `calc()` expressions causing stack overflow with nested calculations - Fixed: radians incorrectly converted to degrees in CSS transform functions **FFI bugfixes**: - Fixed: `bun:ffi` new CString() ignoring byteOffset argument when byteLength not provided **TLS bugfixes**: - Fixed: TLS server identity verification improvements - Fixed: proper handling of IP range normalization (e.g., "8.8.8.0/24") **HTTP/2 bugfixes**: - Fixed: HTTP/2 flow control and protocol handling issues **Windows bugfixes**: - Fixed: crash handler now uses `abort()` instead of `quick_exit(134)` for better debugging - Fixed: WebKit and libpas dependencies updated for Windows builds **Environment variables**: - Added: `BUN_BE_BUN` environment variable for running the Bun binary instead of the entry point of a single-file executable **CLI improvements**: - Improved: help text formatting and documentation links for package manager commands - Removed: `audit` from `bun pm` help (use `bun audit` directly) **TypeScript types**: - Fixed: `RedisClient.prototype.del` accepts one or more keys as arguments ### Thanks to 25 contributors! - [@190n](https://github.com/190n) - [@39ali](https://github.com/39ali) - [@alii](https://github.com/alii) - [@cirospaciari](https://github.com/cirospaciari) - [@connerlphillippi](https://github.com/connerlphillippi) - [@dylan-conway](https://github.com/dylan-conway) - [@electroid](https://github.com/electroid) - [@familyboat](https://github.com/familyboat) - [@gameroman](https://github.com/gameroman) - [@heimskr](https://github.com/heimskr) - [@jarred-sumner](https://github.com/jarred-sumner) - [@joelshepherd](https://github.com/joelshepherd) - [@juliesaia](https://github.com/juliesaia) - [@justinyaodu](https://github.com/justinyaodu) - [@leanderpaul](https://github.com/leanderpaul) - [@nektro](https://github.com/nektro) - [@nobkd](https://github.com/nobkd) - [@pfgithub](https://github.com/pfgithub) - [@pxseu](https://github.com/pxseu) - [@sponte](https://github.com/sponte) - [@sunsettechuila](https://github.com/sunsettechuila) - [@thdxr](https://github.com/thdxr) - [@thejacob1000](https://github.com/thejacob1000) - [@wldfngrs](https://github.com/wldfngrs) - [@zackradisic](https://github.com/zackradisic)In the next version of Bun
— Jarred Sumner (@jarredsumner) June 5, 2025
You can pass files directly to routes in Bun.serve() pic.twitter.com/Mk8PJwvxIP