LLM reference: react.dev/llms.txt · tanstack.com/llms.txt · Key effect page: You Might Not Need an Effect

React + TypeScript (FMC)

Type-safe React = compile-time guarantees. This skill covers TypeScript patterns agents often get wrong and useEffect discipline (naming, scope, when to skip). Routing and server I/O live in sibling skills (below).

When to use

• Typing props, children, refs, event handlers
• Generic/reusable components (Table<T>, discriminated unions)
• React 19 APIs (use(), ref as prop) — typing only
• Writing or reviewing useEffect, useEffectEvent, effect cleanup, derived state
• Reviewing TS or effects in components under components/

Not here: route loaders, createServerFn, SSR, Zustand → see Related skills.

FMC stack (required)