Bun v1.3.3

Bun version 1.3.3 has been released, fixing 95 issues and introducing several new features. The update adds support for `CompressionStream` and `DecompressionStream` Web APIs (including brotli and zstd formats), new `retry` and `repeats` options for `bun:test`, and flags to disable automatic `.env` and `bunfig.toml` loading in standalone executables. Additionally, the release upgrades SQLite to version 3.51.0 and rebuilds Bun with Zig 0.15.2, reducing binary size by 0.8MB.

This release fixes 95 issues addressing 348 👍 reactions 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 CompressionStream and DecompressionStream Bun now implements CompressionStream and DecompressionStream . These standard Web APIs allow for streaming compression and decompression of data without buffering the entire payload in memory. In addition to the standard "gzip" , "deflate" , and "deflate-raw" formats, Bun also supports "brotli" and "zstd" . const response = await fetch "https://example.com" ; // Compress the response body using gzip const compressed = response.body.pipeThrough new CompressionStream "gzip" ; // Or use zstd for faster compression const zstd = response.body.pipeThrough new CompressionStream "zstd" ; Thanks to @nektro for the contribution Control .env and bunfig.toml loading in standalone executables Standalone executables created with bun build --compile normally look for .env and bunfig.toml files in the directory where the executable is run. You can now disable this behavior at build time using the --no-compile-autoload-dotenv and --no-compile-autoload-bunfig flags. This is useful when you want to ensure the executable behaves deterministically, regardless of the configuration files present in the user's working directory. Disable .env and bunfig.toml loading bun build --compile --no-compile-autoload-dotenv --no-compile-autoload-bunfig app.ts You can also configure this via the JavaScript API: await Bun.build { entrypoints: "./app.ts" , compile: { // Disable .env loading autoloadDotenv: false, // Disable bunfig.toml loading autoloadBunfig: false, }, } ; retry and repeats in bun:test You can now use the retry and repeats options in bun:test . retry runs the callback function up to the specified number of times and if the test passes once then the test passes, while repeats runs the callback function up to the specified number of times and if the test fails once then the test fails. This is useful for handling flaky tests. import { test } from "bun:test"; test "flaky test", = { if Math.random 0.1 throw new Error "fail" ; }, { retry: 3 }, ; test "check for flakiness", = { // run this 20 times to ensure it's stable }, { repeats: 20 }, ; Thanks to @pfgithub for the contribution --no-env-file You can now disable Bun's automatic .env file loading using the --no-env-file flag. This is useful in production environments or CI/CD pipelines where you want to rely solely on system environment variables. bun run --no-env-file index.ts This can also be configured in bunfig.toml : Disable loading .env files env = false Explicitly provided environment files via --env-file will still be loaded even when default loading is disabled. SQLite 3.51.0 bun:sqlite has been updated to SQLite v3.51.0. import { Database } from "bun:sqlite"; const db = new Database ; console.log db.prepare "SELECT sqlite version " .get ; // { "sqlite version ": "3.51.0" } Internal: Upgraded to Zig 0.15.2 Bun is now built with Zig 0.15.2. This reduces the binary size by 0.8MB and improves build times for contributors. Bundler fixes - Fixed: A rare panic in the dev server when processing CSS assets in the incremental graph - Fixed: A rare panic in the dev server that could occur when a file referenced by a dynamic import is deleted during a reload bun install fixes - Fixed: A rare crash during bun install involving optional peer dependencies - Fixed: A regression in bun install when parsing git dependency URLs with a leading hash - Fixed: A regression from Bun v1.3.2 that could cause bun ls --all with unresolved optional peer dependencies to crash - Fixed: A regression from Bun v1.3.2 where sharp versions older than v0.33.0 failed to install correctly Windows fixes - Fixed: process.stdout now emits'resize' events andSIGWINCH signals on Windows, which fixes terminal resizing issues in Claude Code & OpenCode on Windows - Improved: bun getcompletes works on Windows - Fixed: a crash on Windows when laptop hibernates and then wakes up and resumes execution after a Worker thread had been terminated Node.js compatibility improvements - Implemented: handle.fd innode:net andnode:tls for better compatibility with libraries that rely on the socket file descriptor - Fixed: N-API bug preventing rspack orrsbuild from working Web APIs fixes - Fixed: fuzzer-discovered crash when using JSON.stringify on a FormData object in rare cases - Fixed: fuzzer-discovered crash when calling stream on a Blob in certain edge cases - Fixed: sanitizer-discovered memory leak in Blob Bun.serve - Fixed: An issue where Unicode characters in Bun.serve staticResponse objects given a string as input were missing theContent-Type header Networking - Fixed: sanitizer-discovered memory leak in node:net.SocketAddress when passing an invalid port - Fixed: sanitizer-discovered memory leak in Bun.listen when errors are thrown during socket creation YAML - Fixed: Bun.YAML.stringify would incorrectly serialize strings with leading zeros as numbers - Fixed: A performance issue where YAML merge keys could cause parsing to hang due to exponential complexity Transpiler - Fixed: fuzzer-discovered crash in new Bun.Transpiler with invalid configuration Bun.spawn - Fixed: A small memory leak in Bun.spawn when passing extra non-IPC, non-stdout, non-stderr, and non-stdin file descriptors TypeScript definitions - Fixed: Added JSDoc documentation for configVersion inBunLockFile type definition - Fixed: Added missing "css" ,"jsonc" ,"yaml" , and"html" to theLoader type definition - Fixed: Removed unnecessary dependency on @types/react in@types/bun Security - Fixed: Updated root certificates to Mozilla NSS 3.117 bun upgrade fixes - Improved: bun upgrade now displays download sizes in human-readable units e.g.23.2MiB instead of raw bytes