What is the main benefit of using fp-ts for error handling?

It makes errors explicit in your type signatures, forcing you to handle them at compile-time and avoiding 'invisible' runtime exceptions that cause crashes.

How does this help with asynchronous code?

It introduces TaskEither, which manages Promises that might fail, allowing you to chain multiple async operations together without messy, nested try/catch blocks.

Can I collect multiple validation errors at once?

Absolutely. The skill covers Applicative Validation using sequenceS to aggregate errors from multiple fields into a single list, which is ideal for form processing.

Does this skill work with existing TypeScript projects?

Yes, it provides patterns to wrap existing 'throwing' functions using E.tryCatch and TE.tryCatch, allowing for gradual adoption in any codebase.

Is advanced functional programming knowledge required?

No. This skill focuses on practical, real-world implementation patterns rather than academic theory, making it accessible for most TypeScript developers.

Functional Error Handling (fp-ts)

Name: Functional Error Handling (fp-ts)
Author: JantonioFC

byJantonioFC

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API Development

Implements type-safe error handling patterns using fp-ts to replace unpredictable try/catch blocks with explicit Either and TaskEither values.

This skill equips Claude with the expertise to refactor traditional TypeScript exception-based logic into robust, functional pipelines. By treating errors as data rather than hidden side effects, it helps developers leverage the fp-ts library to create predictable codebases where failure states are tracked by the TypeScript compiler. It focuses on practical patterns for the Result pattern (Either), asynchronous error management (TaskEither), and error accumulation for complex form validation, ensuring that error handling becomes a visible and manageable part of the application's type system.

Key Features

01Composing complex logic chains using pipe and chain operations

02Implementing parallel validation to accumulate multiple errors simultaneously

03Refactoring runtime exceptions into type-safe Either (Left/Right) values

04Managing asynchronous operations with lazy, failure-aware TaskEither

052 GitHub stars

06Using Do notation to simplify access to intermediate pipeline results

Use Cases

01Refactoring nested try/catch 'spaghetti' code into clean functional pipelines

02Building robust API consumers that explicitly handle network and parsing failures

03Creating complex form validators that return all field errors at once instead of stopping at the first one

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jantoniofc/skillsbank fp-errors

For use in Claude.ai and ChatGPT