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Bun AoT Type Checking Speedup
Jarred Sumner says Bun AoT is getting good: TypeScript 6 built with it typechecks Effect slightly faster than TypeScript 7 when single-threaded.
Key points
- Bun AoT compiled TypeScript 6 typechecks Effect slightly faster than TypeScript 7 when single-threaded, according to @jarredsumner.
- @jarredsumner said one ecosystem challenge of Bun AoT is that type declarations aren't enough, and that compiling from source .ts files instead of .d.ts is needed to maximize the performance advantage over JIT.
- @jarredsumner said the compiler needs to know all the shapes every function sees, including arguments, return types, and inside the function, and that it has fallbacks for everything but fallbacks are slower.
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What others are saying
4 more-
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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Charlie Marsh finds thin LTO on PGO instrumented binaries cuts build time with no final performance cost.
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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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Bun's Sumner previews experimental AOT compilation with JSC: Claude Code CLI starts 24% faster with 48% less memory.
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Top replies on X
Reaction on X: Replies were largely impressed, with the original poster noting TS 6 vs TS 7 is a good benchmarking repo because it is a close Go implementation of the same code. One reply asked whether any code changes were needed when moving to AOT, and another joked about "Attack on Titan."
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From @jarredsumner, @forloopcodes, @rasibx and others. Spam removed, with English and Chinese translations.
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