Bridging Kotlin Coroutines and Swift 6 Structured Concurrency in KMP: Building Leak-Free Shared Async APIs

--- title : " Bridging Kotlin Coroutines and Swift 6 Concurrency in KMP" published : true description : " A step-by-step workshop for exposing leak-free async APIs from KMP shared modules — mapping Flows to AsyncSequence, handling Sendable, and scoping coroutines to platform lifecycles." tags : kotlin, swift, architecture, mobile canonical_url : https://blog.mvp-factory.com/bridging-kotlin-coroutines-swift-concurrency-kmp --- ## What we are building In this workshop, we will wire up a Kotlin Multiplatform shared module so that `suspend` functions become Swift `async` / `await` calls and `Flow` streams become `AsyncSequence` — all without leaking coroutines when a SwiftUI view disappears or an Android ViewModel clears. By the end you will have a three-layer bridging architecture you can drop into any production KMP project. Let me show you a pattern I use in every project. ## Prerequisites - Kotlin 2.0+ with the new Native memory model enabled (default since 1.7.20) - Swift 6 with stric