Wrote about designing type-safe sync/async mode support in TypeScript. Making object({ sync: syncParser, async: asyncParser }) automatically infer as async turned out to be trickier than expected.
https://hackers.pub/@hongminhee/2026/typescript-sync-async-type-safety
複数のパーサーを合成するとき、一つでも非同期なら結果も非同期になる——これをTypeScriptの型レベルで表現するのが意外と難しかった。Optiqueでの設計過程を書きました。
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