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Bun v1.4.3 release and performance
Bun releases v1.4.3, fixing 166 issues, adding builtin TypeScript checker bun check and Bun.FetchSession, and cutting idle server CPU 67%.
Key points
- Bun v1.4.3 fixes 166 issues, addressing 122 👍, and adds a builtin TypeScript type-checker called `bun check`.
- Bun v1.4.3 brings 67% lower idle CPU in servers, `Bun.FetchSession`, faster JSON.parse, and Node.js compatibility fixes.
- Jarred Sumner says TypeScript 6 built with Bun AoT typechecks Effect slightly faster than TypeScript 7 when single-threaded.
- Jarred Sumner says Bun AoT needs to compile from source .ts files instead of .d.ts to maximize its performance advantage over JIT.
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Jarred Sumner says Bun AoT is getting good: TypeScript 6 built with it typechecks Effect slightly faster than TypeScript 7 when single-threaded.
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Jarred Sumner says a Bun AoT ecosystem challenge is that type declarations aren't enough—compiling from .ts source instead of .d.ts maximizes its edge over JIT.
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Bun's Sumner previews experimental AOT compilation with JSC: Claude Code CLI starts 24% faster with 48% less memory.
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Bun's Sumner explains the compiler must know every function's arguments, return types and internals; fallbacks work but are slower.
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