React Start (@tanstack/react-start)

This skill builds on start-core. Read start-core first for foundational concepts.

This skill covers the React-specific bindings, setup, and patterns for TanStack Start.

For React Server Components patterns, see react-start/server-components.

CRITICAL: All code is ISOMORPHIC by default. Loaders run on BOTH server and client. Use createServerFn for server-only logic.

CRITICAL: Do not confuse @tanstack/react-start with Next.js or Remix. They are completely different frameworks with different APIs.

CRITICAL: Types are FULLY INFERRED. Never cast, never annotate inferred values.

Package API Surface

@tanstack/react-start re-exports everything from @tanstack/start-client-core plus:

• useServerFn — React hook for calling server functions from components