Master TypeScript conditional types, distributive behavior over union types, and the subtle inference rules that power libraries like tRPC, Zod, and Effect through systematic exercises and decoder patterns.
## CONTEXT Conditional types are the single most powerful primitive in the TypeScript type system, underpinning almost every modern type-safe library: tRPC uses them to derive client types from server routers, Zod uses them to infer output types from schemas, Drizzle uses them to map column definitions to row shapes,…
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