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Quick reference for Either type. Use when user needs error handling, validation, or operations that can fail with typed errors.

Quick reference for fp-ts types. Use when user asks which type to use, needs Option/Either/Task decision help, or wants fp-ts imports.

Stop throwing everywhere - handle errors as values using Either and TaskEither for cleaner, more predictable code

Comprehensive guide for refactoring imperative TypeScript code to fp-ts functional patterns