Module 5 of 11

TypeScript

Static types across the whole stack: fundamentals, typed Express APIs, React with TypeScript, and end-to-end type safety.

4 lessons

~12 hours

140 XP

Types, interfaces, unions, narrowing, generics, and a strict tsconfig — everything a JavaScript developer needs to start writing TypeScript.

Type requests, responses, middleware, and errors — then derive validation types from Zod so the API and its types never drift apart.

Type props, state, events, refs, and context — plus discriminated unions for UI state and form types inferred from Zod.

Share types across client and server: a typed API client, contract-first development, schema-derived types, and an honest look at tRPC.