Bun v1.2.8

This release fixes 18 bugs (addressing 18 👍). napi improvements make node-sdl 100x faster. Headers.get() is 2x faster. Several node:http bugfixes. node:fs improvements. bun install --frozen-lockfile now works with overrides. bun pack now handles directory-specific pattern exclusion.

To install Bun

curl -fsSL https://bun.sh/install | bash

npm install -g bun

powershell -c "irm bun.sh/install.ps1|iex"

scoop install bun

brew tap oven-sh/bun

brew install bun

docker pull oven/bun

docker run --rm --init --ulimit memlock=-1:-1 oven/bun

To upgrade Bun

bun upgrade

NAPI improvement makes node-sdl 100x faster

Fixed an issue where napi_create_double was encoding all values as double-precision floating point numbers in JSC, which could lead to performance degradation.

Thanks to @dylan-conway for the contribution!

2x faster headers.get()

Headers.prototype.get(), Headers.prototype.has(), and Headers.prototype.delete() get 2x faster for common header names like "Content-Type".

const headers = new Headers({ "Content-Type": "text/plain" });
// These operations are now 2x faster in Bun
headers.get("Content-Type"); // ~16ns vs ~31ns in 1.2.5
headers.has("Content-Type"); // ~15ns vs ~30ns in 1.2.5
headers.delete("Content-Type"); // ~16ns vs ~31ns in 1.2.5

Fixed: node:http regressions from v1.2.5

In Bun v1.2.5, we rewrote node:http to improve compatibility with Node.js. This introduced some regressions that are now fixed:

• Fixed a regression where socket.end() could cause unexpected errors like ECONNRESET and ERR_STREAM_WRITE_AFTER_END.
• Fixed a regression where HTTP POST requests could fail in certain cases with frameworks like Astro, Nuxt, Koa, and Next.js.
• Fixed a regression where http.request() could incorrectly include Transfer-Encoding: chunked header in empty requests leading to hanging requests.

Please let us know if you run into any more issues with node:http.

Thanks to @cirospaciari & @heimskr for the contribution!

node:fs compatibility improvements

• Fixed a bug where Object.assign() couldn't correctly copy properties from StatFs class instances to target objects. This issue was specific to Bun and didn't occur in Node.js.

import { statfsSync } from "node:fs";

const target = { existingProp: "value" };
const stats = statfsSync("/");

// Now works correctly
const result = Object.assign(target, stats);
console.log(result); // Contains values from the StatFs object

Thanks to @dylan-conway for the contribution!

Fixed: bun install --frozen-lockfile bug when using overrides

Fixed handling of overrides in the lockfile generation, addressing two specific issues:

1. Overrides are now sorted consistently before comparing
2. Even unused overrides are included in the text lockfile

Thanks to @dylan-conway for the contribution!

Bun.write() improvements

• Bun.write() now correctly throws an error when called on a Blob created from a Buffer or TypedArray. Blobs created from bytes are always read-only.
• Bun.write() now properly handles creating directory trees when writing an empty file. This fixes an issue where writing an empty string or writing to a non-existent directory would fail with misleading error messages.

// Now works properly - creates directory and file
await Bun.write("./new/directory/empty.txt", "");

Thanks to @DonIsaac for the contribution!

TypeScript Declaration Improvements

This release includes several improvements to Bun's TypeScript type definitions:

• Fixed AbortSignal static methods (timeout(), abort(), and any()) to work properly in environments where the DOM is missing, also fixing BroadcastChannel issues in non-DOM environments.
• Fixed TypeScript declarations so that types declared in Bun.Env correctly apply to process.env, ensuring consistent typing across both access methods.
• Improved URLSearchParams type definitions for better compatibility with @types/node, working correctly whether lib.dom is enabled or disabled.
• Fixed generic type parameters for ReadableStream and WritableStream, updated S3 documentation, and corrected server interface types to properly handle unix sockets and optional properties.

Thanks to @alii for the contribution!

Fixed: bun pack directory-specific pattern exclusion

bun pack now correctly handles excluding entries that are nested within included directories. Previously, exclusion patterns only worked at the top level, but now you can properly exclude specific files or subdirectories within an included path.

// Example: Pack a project but exclude nested test files
bun pack --exclude "src/**/test/**" --include "src/**"

Thanks to @DonIsaac for the contribution!

Thanks to 10 contributors!

• @alii
• @cirospaciari
• @donisaac
• @dylan-conway
• @hahalosah
• @heimskr
• @jarred-sumner
• @nanome203
• @paperclover
• @pfgithub