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@jarredsumner

Jarred Sumner

@jarredsumner

building @bunjavascript at @anthropicai. formerly: @stripe (twice) @thielfellowship. high school dropout. npm i -g bun

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@jarredsumner's Top Organic Posts 50 organic posts · Paid boosts excluded
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# Date Post ↓
1 Jul 8 Rewriting Bun in Rust 97.4× 3.8M 8.9K 5.0K
2 Aug 10 8 days ago, while jogging, I asked Claude to solve the Riemann Hypothesis It didn’t. 1.5 days later, it proved >= 67% of the zeros are on the line (prev: 41. 35× 1.4M 5.0K 999
3 Aug 11 doesn’t happen anymore 34.7× 1.4M 9.5K 354
4 Dec 2 People frequently ask: > How is Bun sustainable? If I bet my company’s tech stack on Bun, will Bun still be around in a few years? We didn’t have a great ans 34.6× 1.4M 4.7K 320
5 Aug 21 Bun 1.4 is our smallest release yet 27.6× 1.1M 2.3K 392
6 Sep 24 JavaScript was never designed for the server. If that doesn't change soon, JavaScript on the server will be replaced by Rust. The fix needs to happen in the eng 25.6× 1.0M 3.9K 840
7 Aug 27 In the next version of Claude Code Claude Code gets 45% smaller 6.0× 236.1K 3.5K 158
8 Aug 29 In the next version of Claude Code Claude Code starts 20% faster 5.9× 232.0K 1.2K 47
9 Jul 16 I remember the first time a whole crowd of people dunked on one of my tweets. Felt shitty about it for days and it came up with almost every engineer I intervie 5.8× 228.9K 1.0K 261
10 Sep 13 PHP got one thing right JavaScript never had In next week’s version of Bun 5.4× 214.4K 1.5K 164
11 Aug 9 Mar 6: 167 lbs ( -12% ) Apr 14: 156 lbs ( -18% ) May 21: 151 lbs ( -21% ) Aug 9: 147 lbs ( -23% ) goal weight reached 4.6× 182.5K 1.0K 58
12 Sep 8 my favorite way to keep claude running overnight without /loop or /goal tell claude something like: “I’m going to sleep, and when I wake up I would love to see 4.5× 179.1K 2.1K 812
13 Oct 4 The first step is types. We're adding a TypeScript-compatible type checker to Bun. It’s the best shot ahead-of-time compiled TypeScript has at beating languages 3.8× 149.6K 1.8K 207
14 Sep 4 “RuSt ReWrItE wILL kILl BuN” 3.8× 148.9K 2.6K 91
15 Sep 29 An early preview of experimental Bun + JSC with ahead-of-time compilation For Claude Code's CLI: 24% faster startup, 48% lower memory, 46% lower CPU, and nearly 3.7× 145.4K 1.4K 206
16 Sep 26 sounds like a Bun 2.0 3.6× 141.7K 1.3K 82
17 Jul 22 1 engineer + Claude Code got more of Node.js’s test suite passing over the last month than the entire Bun team (me included) did in the 9 months from 1.2 → 1.3 3.6× 140.9K 1.2K 93
18 Aug 16 6 months ago, most of Bun’s PRs came from people prompting Claude Nowadays, most of Bun’s PRs come from Claude prompting Claude 3.4× 134.5K 804 249
19 Jul 6 the blog post 3.4× 133.1K 880 32
20 Jul 13 one of the most impactful memory usage optimizations in bun: schedule gc when the http server finishes sending a response body not clear what the equivalent is 3.1× 121.9K 732 70
21 Aug 16 I used to justify this stuff as “growing Bun as a startup.” Bun isn’t a startup anymore I’m just having fun 3.1× 121.5K 1.1K 60
22 Aug 21 since a lot of people asked re: zig vs rust compile times End-to-end in CI, Bun today compiles ~3.4x faster than before the Rust rewrite. This is end-to-end, in 3.1× 120.8K 1.6K 169
23 Jul 15 Today, a human presses merge. Within a few months I expect: automated reviewer LGTMs -> another Claude with a fresh context window judges if it’s simple and 3.0× 117.5K 713 219
24 Aug 21 In the next version of Bun Bun gets 2 MB smaller 2.6× 103.8K 1.4K 40
25 Oct 15 A year ago, I would've said a linter, a formatter and a type checker were too ambitious for Bun. But for ahead of time compiled TypeScript to have a shot at bei 2.4× 95.2K 1.0K 79
26 Oct 4 More AoT numbers also: claude code is 304 MB now instead of 430 MB 2.3× 90.4K 711 71
27 Aug 24 three months into rust bun. Drop is very nice. PRs have a lower blast radius. I sleep better 2.2× 86.9K 1.7K 54
28 Jul 9 hopefully the blog post was good enough to justify the wait we’re merging some more node.js compatibility improvements and then will release bun v1.4 2.1× 81.0K 1.4K 28
29 Oct 8 Today, Bun is a: - Node-compatible JavaScript runtime - npm-compatible package manager - jest-compatible test runner - esbuild-compatible bundler Next week, Bun 2.0× 80.9K 1.8K 155
30 Aug 12 This was the primary blocker for Bun v1.4 Next up: edit blog post 1.8× 71.9K 651 29
31 Jul 26 Ideal JavaScript runtime architecture: 1) Implement most APIs in native code 2) Declare argument & return types in a code generator 3) Code generate JS < 1.6× 63.3K 572 82
32 Jul 20 I still want Bun to have a builtin on-disk fetch cache, for debugging & testing & avoiding rate limits in one-off scripts maybe multiple backends, one w 1.6× 61.3K 460 51
33 Sep 22 Opus 5.5 is a very good model and I expect it will quickly become the daily driver for a lot of people. The writing style is so much better. It writes like Opus 1.5× 60.1K 1.5K 68
34 Jul 14 Bun and JavaScriptCore now share the same memory allocator, and we ported several great features from libpas to our mimalloc fork. 1.5× 58.6K 829 43
35 Oct 10 Bun AoT is starting to get good TypeScript 6 built with Bun AoT typechecks Effect slightly faster than TypeScript 7 when single-threaded. 1.5× 58.1K 689 70
36 Oct 8 sad we didn't reserve `bun lint` or `bun format` subcommands 1.5× 57.5K 686 23
37 Oct 13 Many people were saying Bun was dead after the acquisition. Then again after the Rust rewrite We’re having fun proving them wrong 1.4× 56.6K 957 47
38 Jul 25 ratio improving 1.4× 56.6K 389 11
39 Aug 28 We're throwing a party in SF for Bun v1.4 on September 9th. If you use Bun (or want to), come hang out 1.4× 55.9K 405 24
40 Aug 7 1 more node compatibility PR to merge then it’ll be time for Bun v1.4 1.3× 52.7K 850 23
41 Aug 22 should we add builtin otel 1.3× 51.4K 684 56
42 Aug 7 number of open PRs > number of open issues that’s a 1st for bun’s repo 1.3× 50.7K 417 10
43 Aug 18 okay I’m editing blog post it’s mostly done if I say a date you won’t believe me but let’s say tomorrow 1.2× 48.8K 546 21
44 Sep 16 In the next version of Bun `Bun.FetchSession` gives you a `fetch` function with its own keepalive connection pool 1.2× 46.3K 627 88
45 Jul 26 this also makes FFI a lot more reliable 1.2× 45.6K 309 15
46 Aug 20 3 hours 1.1× 44.9K 523 13
47 Aug 17 i asked claude what other subcommands should we add to bun in bun v1.4 and this is what it suggested 1.1× 43.7K 343 27
48 Jul 20 now do Jarred.sleep() 1.0× 39.7K 386 7
49 Aug 23 my mentions today 1.0× 39.5K 1.3K 25
50 Oct 7 The plan: use this to give ahead of time compiled JavaScript & TypeScript a real shot at beating Go & other compiled languages’s perf Don’t know yet how 1.0× 38.8K 876 63
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