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Bun
4,023 posts
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Bun
@bunjavascript
Bun is a fast, all-in-one toolkit for installing, bundling, running and testing JavaScript & TypeScript. To install: `npm i -g bun`
bun.com
Joined July 2022
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  • Pinned
    user avatar
    Bun
    @bunjavascript
    Dec 2, 2025
    Bun is joining Anthropic!
    Bun is joining Anthropic
    From bun.com
    4.5M
  • user avatar
    Bun
    @bunjavascript
    Jul 26
    In the next version of Bun bun:ffi gets up to 3x faster
    BUN:FFI • REWRITTEN AS ENGINE-NATIVE FFI IN JAVASCRIPTCORE
up to 3× faster ffi
Symbols & callbacks are engine cells • hot call sites JIT to a bare call; ret • 70× less memory/ symbol
3.0x
3.3x
O bun TinyccO bun •JSC-native
2.3x
1.4x
TINYCC = 1x
noop call 2.27 ns → 763 ps
new CString(
99.5 → 30 ns
yoga layout x1k
opentui benchmark
speedup vs previous TinyCC-based bun:ffi macOS arm64 • opentui: unmodified 347-symbol app
scrollbox 10k opentui benchmark
    130K
  • user avatar
    Bun
    @bunjavascript
    Jul 25
    Closed 911 issues as completed in the last 24 hrs. Many fixed in recent PRs. Some fixed long ago.
    Closed | 911
https://github.com/oven-sh/bun/issues?q=is%3Aissue%20state%3Aclosed%20closed%3A%3E2026-07-23%20reason%3Acompleted
    35K
  • user avatar
    Bun
    @bunjavascript
    Jul 23
    Bun v1.4 starts faster
    Bun v1.4 starts faster than every other Bun.
4.8ms
MS
20
COLD START • HELLO WORLD
1.3.14 •19.3ms
startup regression — fixed in v1.4
10
fastest before v1.4 - 7.1ms
V1.0
V1.1
V1.2
v1.3
4x faster than 1.3.14 • 1.5x faster than any Bun before it console. log (123) • hyperfine, 400 runs, pinned core • Linux x64, AMD EPYC 9R14 • v1.4 = main @ b39a2704
v1.4
    64K
  • user avatar
    Bun
    @bunjavascript
    Jul 22
    Bun v1.4 will be our biggest jump in Node.js compatibility since Bun v1.0
    Line chart titled "Bun's Node.js test suite progress", subtitled "Official Node.js test suite files run on every commit". The line starts at 1,378 test files at Bun v1.2.0 (January 2025), climbs through the 1.2 series to 2,250 at v1.3.14, holds flat across the 1.3 releases, then spikes to 3,188 files on main today (July 2026). A dashed target line at 3,693 reads "The bar to ship Bun v1.4: 3,693", with "505 to go" marking the gap between main and the target.
    186K
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