Compose Compiler IR + Effect API Comparative Guide

1. Compiler IR: CompositionLocal Lowering

LocalA.current

LocalA.current
↓ IR lowering
composer.consume(LocalA)

Provider lowering

CompositionLocalProvider(LocalA provides A1) {
    ...
}
↓
composer.startReplaceableGroup(key)
composer.updateProvider(LocalA, A1)
emit children
composer.endReplaceableGroup()

2. Effect APIs 심층 비교

rememberUpdatedState

ongoing coroutine 또는 callback이 최신 값을 참조하도록 유지
Keeps latest value available to ongoing effects.

DisposableEffect

CompositionLocal이 바뀌거나 제거될 때 unregister 필요할 때
Used for lifecycle-bound registrations.

LaunchedEffect

CompositionLocal 변경 시 coroutine을 재실행해야 할 때
Runs coroutine when key (often Local value) changes.

3. 타임라인 비교

remember:
  persists across recomposition

rememberUpdatedState:
  updates reference only, keeps coroutine alive

DisposableEffect:
  cleanup on key change

LaunchedEffect:
  restart effect on key change