Coroutines and Dispatchers in KMP

Use this skill when implementing or reviewing coroutine concurrency, dispatcher choice, or main-thread safety across KMP targets.

Goals

• Never block Main with disk/network/CPU-heavy work
• Correct Dispatchers.Main behavior on Android and Kotlin/Native
• Testable code via injectable dispatchers
• Safe delivery of UI state to Compose and SwiftUI

Prefer official defaults

• Use structured concurrency (coroutineScope, supervisorScope, ViewModel/presenter scope) — no unstructured GlobalScope for app work.
• Run IO/CPU work on Dispatchers.Default or an injected IO dispatcher; switch to Main only for UI-facing emission.
• Prefer repository / data APIs that are main-safe (safe to call from Main; they move work internally).
• Inject CoroutineDispatcher (or a small DispatcherProvider) in types you unit-test.

Docs: https://kotlinlang.org/docs/coroutines-guide.html · https://kotlinlang.org/docs/multiplatform/compose-compatibility-and-versioning.html (lifecycle/coroutines artifacts as applicable)