Effect-TS Error Handling

Overview

Effect-TS provides a type-safe error channel (E in Effect<A, E, R>) that tracks potential failures. Use Tagged Errors for distinguishability and specialized combinators for handling or accumulating errors.

When to Use

• Defining custom error types for domain logic.
• Handling specific errors without catching everything.
• Validating multiple fields and collecting all failures.

When NOT to use:

• Simple try/catch for non-Effect code.
• When error types don't need to be distinguished (use Effect.fail(message)).

Core Pattern

Before (Generic Errors):

if (!user) throw new Error("Not found");