effect-resilience

Retry failed async operations using Effect.retry combined with Schedule combinators like exponential backoff and jitter. Effect handles typed errors and automatically re-executes your operation according to the schedule you define, preventing cascading failures.

Yes, Effect.timeout enforces time limits on async operations and returns typed errors when exceeded. This lets you fail fast and distinguish timeout failures from other error types in your error handling logic.

Use Effect.repeat with polling schedules to loop over status checks until a condition is met. Combine it with Schedule.spaced or Schedule.recurs to control polling frequency and iteration limits without manual loop management.

Wrap Effect operations in fromPromise within XState v5 state machines. This lets you apply Effect.retry, Effect.timeout, and Effect.repeat patterns to promises invoked by XState, maintaining typed error handling across state transitions.

Effect Schedule combinators prevent common pitfalls like unbounded retries, missing jitter in backoff (causing thundering herd), and hardcoded delays. Using Schedule forces explicit retry logic, error typing, and failure boundaries into your async flow.

Polling works best for external service status checks, rate-limited APIs, or systems without webhook support. Effect.repeat with scheduling lets you poll efficiently with controlled frequency, though event-driven patterns are preferable when the source emits notifications directly.