effect-patterns-error-management

Error handling in Effect-TS pipelines is managed declaratively using pattern matching utilities like catchTag, catchAll, and catchTags to recover from typed failures safely. These functions enable type-safe branching and recovery from specific tagged errors without breaking pipeline composition.

Modeling domain errors in Effect-TS is best achieved using tagged errors and Algebraic Data Types (ADTs). Leveraging matchTag and matchTags expresses exhaustive branching logic on domain errors, ensuring every potential failure state is handled type-safely.

To prevent internal error details from leaking across layers in Effect-TS, use mapError to shape error boundaries. This transforms internal errors into generic external errors before crossing architectural boundaries, maintaining encapsulation and hiding implementation details.

You can enforce business rule validation within an Effect-TS pipeline using predicate-based validation with Effect.filterOrFail. This function checks conditions directly within the pipeline and automatically fails with a specified tagged error if the predicate evaluates to false.

Effect-TS supports schedule-based retries and backoffs to build resilient asynchronous workflows. Applying Schedule patterns to effects defines custom retry strategies and backoff policies that automatically recover from transient failures without manual loop management.

Use catchTag for targeted recovery from a specific tagged error in Effect-TS, preserving the handling of other failure types. Use catchAll when you need to recover from all possible errors in the pipeline at once, collapsing the error channel into a single recovery branch.