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bunjavascript.mbdio.uk
Bun (unofficial)
@bunjavascript.mbdio.uk
3 followers 1 following 9 posts
Bun is a fast, all-in-one toolkit for installing, bundling, running and testing JavaScript & TypeScript. To install: `npm i -g bun`

Unofficial account run by @danielmorrisey.com that bridges X posts to Bluesky
x.com/bunjavascript
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bunjavascript.mbdio.uk
In the next version of Bun

Bun for Windows ARM64!
Image from Twitter
February 19, 2026 at 6:15 AM
bunjavascript.mbdio.uk
Bun is joining Anthropic!

https://bun.com/blog/bun-joins-anthropic
Bun is joining Anthropic | Bun Blog
Bun has been acquired by Anthropic. Anthropic is betting on Bun as the infrastructure powering Claude Code, Claude Agent SDK, and future AI coding products & tools.
bun.com
February 15, 2026 at 4:00 AM
bunjavascript.mbdio.uk
Bun v1.3.9
- Fixes 23 issues
- Run multiple package.json scripts or files in parallel or sequential with `bun run --parallel 'server.ts' 'build:*'`
- ESM bytecode in `bun build --compile`
- Faster: RegExp, string.trim() & more

Thanks to 11 contributors!
https://bun.com/blog/bun-v1.3.9
Bun v1.3.9 | Bun Blog
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.
bun.com
February 15, 2026 at 4:00 AM
bunjavascript.mbdio.uk
In the next version of Bun & Safari

`string.trim()` gets 10% - 42% faster, thanks to @__sosukesuzuki
String#trim Optimized String.prototype.trim, trimStart, and trimEnd now use direct pointer access via span8()/span16() instead of indirect str[i] character access, avoiding repeated bounds checking. Benchmark Speedup string-trim 1.17x faster string-trim-end 1.42x faster string-trim-start 1.10x faster 73a97d320d4b
February 15, 2026 at 4:00 AM
bunjavascript.mbdio.uk
In the next version of Bun & Safari

`map.size` & `set.size` gets 2x faster, thanks to @__sosukesuzuki
Set#size and Map#size Optimized in DFG/FTL and Inline Caches The .size getter on Set and Map is now handled as an intrinsic in the DFG/FTL tiers and inline caches, eliminating the overhead of a generic getter call. Benchmark Speedup set-size 2.24x faster map-size 2.74x faster 2e2c23521a24
February 15, 2026 at 3:59 AM
bunjavascript.mbdio.uk
In the next version of Bun & Safari

`myString.startsWith(a)` gets 1.2x - 5x faster, thanks to @__sosukesuzuki
### `String#startsWith` Optimized in DFG/FTL `String.prototype.startsWith` is now an intrinsic in the DFG and FTL JIT tiers, with constant folding support when both the string and search term are known at compile time. | Benchmark | Speedup | |---|---| | `string-prototype-startswith` | **1.42x faster** | | `string-prototype-startswith-constant-folding` | **5.76x faster** | | `string-prototype-startswith-with-index` | **1.22x faster** | - [`1f7d7d5a8c23`](https://github.com/oven-sh/WebKit/commit/1f7d7d5a8c23)
February 15, 2026 at 3:59 AM
bunjavascript.mbdio.uk
Here's what Bun shipped January 2026, across 3 releases & 144 issues fixed (addressing 374 👍). Thanks to 38 contributors!
New APIs • Bun.markdown (v1.3.8) — Fast CommonMark-compliant Markdown parser in Zig. Three modes: html(), render() (custom callbacks), react() (returns React Fragment). GFM extensions, wiki links, LaTeX math. • Bun.Archive (v1.3.6) — Create/extract tar archives with gzip. Glob-based extraction, direct S3 writes. • Bun.JSON5 (v1.3.7) — Native JSON5 parser/stringifier with native .json5 imports. • Bun.JSONL (v1.3.7) — Built-in JSONL parser with streaming support via parseChunk(). • Bun.JSONC (v1.3.6) — JSON with Comments parser for tsconfig.json, VS Code settings, etc. • Bun.wrapAnsi() (v1.3.7) — Native wrap-ansi replacement, 33-88x faster. Bundler & Build • metafile in Bun.build — esbuild-compatible bundle metadata • --metafile-md — LLM-friendly markdown bundle analysis • files option — bundle virtual files that don't exist on disk • --compile-executable-path — local Bun executable for cross-compilation Profiling & Debugging • --cpu-prof-md — markdown CPU profiles • --heap-prof / -
February 15, 2026 at 3:59 AM
bunjavascript.mbdio.uk
Bun v1.3.9 is compiling
Image from Twitter
February 15, 2026 at 3:59 AM