Does this require external libraries like fp-ts?

No, this skill focuses on lightweight, 'paste-ready' TypeScript helpers that implement core functional patterns without requiring heavy external dependencies.

When should I use Branded Types?

Use them when you need to distinguish between identical primitive types at compile time, such as preventing the accidental mixing of 'Cents' and 'Dollars' or 'UserId' and 'OrderId'.

What are the main benefits of using this skill with Claude?

It guides Claude to generate code that is more predictable and less prone to runtime errors by utilizing TypeScript's advanced type system features like discriminated unions and branded types to make illegal states unrepresentable.

How does this improve error handling?

It promotes the use of the Result type, which makes failure states explicit in function signatures. This forces developers to handle errors at the call site, reducing unhandled exceptions.

TypeScript Functional Design Patterns

Name: TypeScript Functional Design Patterns
Author: martinffx

bymartinffx

•

Herramientas para Desarrolladores

Implements advanced functional programming patterns in TypeScript to create type-safe, error-resilient domain models and state machines.

This skill equips Claude with the expertise to build robust TypeScript systems using functional programming paradigms like Algebraic Data Types (ADTs), Result and Option types, and branded types. By shifting validation from runtime checks to the type system, it helps developers eliminate 'impossible states,' ensure exhaustive error handling, and create self-documenting codebases. It is particularly useful for financial applications, complex state management, and any project where reliability and maintainability are top priorities.

Características Principales

01Nominal typing via Branded Types to prevent unit and ID confusion

026 GitHub stars

03Type-safe error handling using Result and Option patterns instead of exceptions

04Automated exhaustiveness checking with assertNever patterns

05Lightweight, dependency-free functional utility helpers for rapid adoption

06Implementation of Discriminated Unions for exhaustive state management

Casos de Uso

01Building type-safe domain models where business rules are enforced at compile time

02Modeling complex state machines like transaction lifecycles or multi-step UI flows

03Standardizing error propagation in backend APIs to ensure all failure cases are handled

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add martinffx/claude-code-atelier atelier-typescript-functional-patterns

For use in Claude.ai and ChatGPT

Download Skill