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kotlinx.coroutines v1.3.0-RC2 Release Notes

  • Flow improvements

    • 💻 Operators for UI programming are reworked for the sake of consistency, naming scheme for operator overloads is introduced:

      • combineLatest is deprecated in the favor of combine.
      • combineTransform operator for non-trivial transformations (#1224).
      • Top-level combine and combineTransform overloads for multiple flows (#1262).
      • switchMap is deprecated. flatMapLatest, mapLatest and transformLatest are introduced instead (#1335).
      • collectLatest terminal operator (#1269).

    • 👌 Improved cancellation support in flattenMerge (#1392).

    • channelFlow cancellation does not leak to the parent (#1334).

    • 🛠 Fixed flow invariant enforcement for suspend fun main (#1421).

    • 🗄 delayEach and delayFlow are deprecated (#1429).

    General changes

    • Integration with Reactor context

      • Propagation of the coroutine context of await calls into Mono/Flux builder.
      • Publisher.asFlow propagates coroutine context from collect call to the Publisher.
      • New Flow.asFlux builder.

    • ServiceLoader-code is adjusted to avoid I/O on the Main thread on newer (3.6.0+) Android toolchain.

    • 🏗 Stacktrace recovery support for minified builds on Android (#1416).

    • ⚡️ Guava version in kotlinx-coroutines-guava updated to 28.0.

    • setTimeout-based JS dispatcher for platforms where process is unavailable (#1404).

    • Native, JS and common modules are added to kotlinx-coroutines-bom.

    • 🛠 Fixed bug with ignored acquiredPermits in Semaphore (#1423).