effect-concurrency-testing

SKILL.md

This skill provides patterns for testing Effect's concurrency primitives: fibers, latches, deferreds, PubSub, SubscriptionRef, and streams.

CRITICAL: Choose the correct coordination primitive based on what you need to synchronize.

| Simple fiber yield | Effect.yieldNow | | Forked PubSub subscriber ready | yieldNow after fork, yieldNow after each publish | | Wait for subscriber ready | Deferred.make() + Deferred.await | | Wait for stream element | Effect.makeLatch() + Stream.tap(() => latch.open) | | Time-dependent behavior | TestClock.adjust |

Test Effect concurrency primitives including PubSub, Deferred, Latch, Fiber coordination, SubscriptionRef, and Stream. Use this skill when testing concurrent effects, event-driven systems, or fiber coordination. Source: front-depiction/claude-setup.

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