--- title: Sealed Generics and SKIE | daily.dev description: SKIE is a Kotlin Multiplatform plugin that bridges the gap between Kotlin's sealed classes with generics and Swift. Without SKIE, sealed classes lose their... canonical: https://daily.dev/posts/sealed-generics-and-skie-yqexrg1wf twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Sealed Generics and SKIE | daily.dev og:description: SKIE is a Kotlin Multiplatform plugin that bridges the gap between Kotlin's sealed classes with generics and Swift. Without SKIE, sealed classes lose their... og:url: https://daily.dev/posts/sealed-generics-and-skie-yqexrg1wf og:image: https://api.daily.dev/og/posts/YQExRG1Wf.png og:image:alt: Sealed Generics and SKIE og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Sealed Generics and SKIE **[Touchlab](https://daily.dev/sources/touchlab)** · 5 min read · 0 upvotes · 0 comments ## Summary SKIE is a Kotlin Multiplatform plugin that bridges the gap between Kotlin's sealed classes with generics and Swift. Without SKIE, sealed classes lose their generic type information when passing through the Objective-C layer, requiring unsafe casts and a default branch in Swift switch statements. With SKIE, sealed classes become exhaustive Swift enums via the `onEnum(of:)` helper, preserving generic type safety and integrating natively with Swift concurrency. A practical example using a `Flow>` demonstrates how SKIE enables type-safe, exhaustive pattern matching on generic sealed results while also supporting async/await iteration over Kotlin flows. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Consuming SKIE Flows in SwiftUI](https://daily.dev/posts/consuming-skie-flows-in-swiftui-nxkwmuyhl) · Touchlab · 0 upvotes · 0 comments - [The Clean Line: Swift Export for KMP \| KMP Bits](https://daily.dev/posts/the-clean-line-swift-export-for-kmp-kmp-bits-dvq0zxygg) · ProAndroidDev · 0 upvotes · 0 comments - [Kotlin : Sealed Classes and Interface](https://daily.dev/posts/kotlin-sealed-classes-and-interface-dtu0kurmx) · droidcon · 0 upvotes · 0 comments - [Kotlin Weekly \#484](https://daily.dev/posts/kotlin-weekly-484-k13jz5pcy) · Kotlin Weekly · 0 upvotes · 0 comments - [5 Kotlin Features Every Android Developer Should Actually Be Using part 1](https://daily.dev/posts/5-kotlin-features-every-android-developer-should-actually-be-using-part-1-puwyfdeef) · Medium · 3 upvotes · 0 comments --- Tags: [#swift](https://daily.dev/tags/swift), [#kotlin](https://daily.dev/tags/kotlin) [View this post on daily.dev](https://daily.dev/posts/sealed-generics-and-skie-yqexrg1wf) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Sealed Generics and SKIE","url":"https://daily.dev/posts/sealed-generics-and-skie-yqexrg1wf","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/sealed-generics-and-skie-yqexrg1wf"},"datePublished":"2026-08-02T07:15:28.031Z","dateModified":"2026-08-02T07:40:06.941Z","description":"SKIE is a Kotlin Multiplatform plugin that bridges the gap between Kotlin's sealed classes with generics and Swift. 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