refactor(tui): use Latch for renderer shutdown gate - #43572
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What
The TUI's renderer shutdown signal is a
Deferred<unknown>completed once withEffect.voidwhen the renderer emitsdestroy— the value is never consumed, and the<unknown>type parameter obscures that. It is a pure "renderer destroyed" gate, which is exactly whatLatchexpresses.How
packages/tui/src/app.tsx:shutdownis nowyield* Latch.make()(starts closed).renderer.once("destroy", ...)callsshutdown.openUnsafe()instead ofDeferred.doneUnsafe(shutdown, Effect.void).yield* shutdown.await.No behavior change. Found by a repo-wide audit of
Deferred<void>-as-gate patterns; sibling PRs convert the other pure-gate sites.Testing
packages/tui:bun typecheck;bun test test/app-lifecycle.test.tsx(5 pass, exercising the destroy → shutdown path); fullbun run test(738 tests, 0 fail).