Releases of the fast all-in-one JavaScript runtime.
Fixes 166 issues, addressing 122 👍. bun check, a TypeScript type checker built into Bun that is 3x to 6.4x faster than tsc 7, check for bun run, bun build and bun test, 67–89% less idle CPU, Bun.FetchSession, experimental Bun.ModuleGraph, disallow code generation from strings, up to 2.7x faster large node:http…
This release fixes two regressions impacting Elysia and AsyncLocalStorage, a hang in @discordjs/ws, CMYK JPEG decoding in Bun.Image, a rare JIT crash, and a GC crash on musl.
Fixes 202 issues, addressing 236 👍. HTTP/2 in Bun.serve, Bun.write() streams Response bodies to disk, self contained workspace node modules, bun install offline and prefer offline, WebSocket pause() and resume(), crypto.argon2, tree shaking through dynamic import(), smarter CommonJS to ESM conversion for default…
Bun 1.4 rewrites Bun in Rust, ships built in headless browser automation (Bun.WebView), Bun.Image, Bun.markdown, JSON5, JSONL, Terminal and cron APIs, Node.js 26.3.0 compatibility with 1,517 newly passing tests, parallel test and run, Windows ARM64, and an opt in global virtual store for up to 7× faster installs.
Fixes 92 issues (addressing 380 👍). Bun.Image — a built in image processing API, 7x faster warm installs with the isolated linker's global store, experimental HTTP/2 and HTTP/3 clients for fetch(), HTTP/3 (QUIC) in Bun.serve(), rewritten fs.watch() on Linux and macOS, no orphans CLI flag, process.execve(),…
Fixes 82 issues (addressing 381 👍). bun test parallel, isolate, shard, and changed, bun install streams tarballs to disk using 17x less memory, source maps use 8x less memory, 5.5x faster gzip with zlib ng, Range request support in Bun.serve(), SHA3 in node:crypto and WebCrypto, ws+unix:// WebSocket client, and many…
Fixes 120 issues (addressing 219 👍). Render Markdown in the terminal with bun ./file.md, Bun.WebView headless browser automation, in process Bun.cron() scheduler, async stack traces for native errors, 2.3x faster URLPattern, 2x faster Bun.Glob.scan, cgroup aware parallelism on Linux, and many bugfixes and Node.js…
Fixes 105 issues (addressing 307 👍). 4 MB smaller on Linux. x64 Bun.cron for OS level cron jobs and expression parsing, Bun.sliceAnsi for ANSI/grapheme aware string slicing, richer Bun.markdown list metadata; bun test path ignore patterns; native Windows ARM64 .bin shim; dgram UDP fixed on macOS, fs.openSync numeric…
Fixes 155 issues (addressing 642 👍). New native REPL, compile target=browser for self contained HTML, TC39 standard ES decorators, Windows ARM64 support, barrel import optimization, and a faster event loop. structuredClone up to 25x faster for arrays, Buffer.slice() 1.8x faster, path.parse() up to 7x faster, fewer…
Fixes 23 issues (addressing 13 👍). Run multiple scripts in parallel or sequential. bun:test mock & spyOn get Symbol.dispose support. ESM bytecode compilation. Faster Bun.markdown. Faster RegExp, String.prototype.trim, String.prototype.startsWith.
Fixes 8 issues (addressing 6 👍). Bun.markdown is a builtin CommonMark compliant Markdown parser written in Zig. Bun's bundler gets bun build metafile md to write LLM friendly module graph metadata. Fixes a regression in 'npm install g bun' on Windows.
Fixes 91 issues (addressing 243 👍). 50% faster , 35% faster async/await, 3x faster , 90% faster / via JSC upgrade. New: , , (33 88x faster than wrap ansi npm), , , Profiler API, for . Fetch now preserves header casing. HTTP/2 fixes for AWS ALB/gRPC/Fauna.
Fixes 45 issues (addressing 125 👍). Bun.Archive API for creating & extracting tarballs with gzip compression, Bun.JSONC for parsing JSON with comments, metafile & files options in Bun.build for bundle analysis and virtual files, Response.json() 3.5x faster, 15% faster async/await, 30% faster Promise.race, 20x faster…
Fixes 32 issues (addressing 25 👍). Bun.Terminal API, compile time feature flags, improved Bun.stringWidth accuracy, V8 C++ value type checking APIs, Content Disposition support for S3 uploads, environment variable expansion in .npmrc quoted values, and numerous bug fixes & node.js compatibility improvements
