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trpc-pro

tRPC guidance — end-to-end typesafe APIs, routers, procedures, auth, and React Query integration.

skills/trpc-pro/SKILL.md

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## Overview

tRPC gives you end-to-end type safety for TypeScript APIs without codegen or schemas: define procedures on the server, call them from the client like functions, and types flow automatically. It's the fastest path to a typesafe full-stack TypeScript app — and it's deliberately not a public-API technology. This skill covers structuring tRPC routers, procedure patterns (query/mutation/subscription), auth via context, and the React Query integration that powers the client.

## When to use

- Building a full-stack TypeScript app (Next.js, Vite + Express, etc.).
- Choosing between tRPC, REST, and GraphQL for internal APIs.
- Structuring routers, procedures, and middleware in tRPC.
- Adding auth, validation (Zod), and error handling to tRPC.
- Using subscriptions (WebSockets/SSE) with tRPC.
- Migrating an existing REST API to tRPC incrementally.

## Core concepts