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---
name: fp-react
description: Practical patterns for using fp-ts with React - hooks, state, forms, data fetching. Works with React 18/19, Next.js 14/15.
risk: critical
source: community
date_added: "2026-09-04"
version: 2.0.0
tags: [fp-ts, react, typescript, hooks, state-management, forms, data-fetching, remote-data, react-19, next-js]
---
# Functional Programming in React
Practical patterns for React apps. No jargon, just code that works.
---
## Detailed Guide
Read [the detailed guide](references/detailed-guide.md) before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.
## When to Use What
| Situation | Use |
|-----------|-----|
| Value might not exist | `Option<T>` |
| Operation might fail (sync) | `Either<E, A>` |
| Async operation might fail | `TaskEither<E, A>` |
| Need loading/error/success UI | `RemoteData<E, A>` |
| Form with multiple validations | `Either` with validation applicative |
| Dependency injection | Context + `ReaderTaskEither` |
| Prevent re-renders with fp-ts | `useMemo` or `fp-ts-react-stable-hooks` |
---
## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
