Design generic constraints that produce excellent inference, helpful error messages, and zero unsafe casts for TypeScript libraries modeled on tRPC, Zod, Drizzle, and Effect.
## CONTEXT The difference between a TypeScript library that feels magical and one that feels miserable comes down almost entirely to generic constraint design. tRPC's `router` function infers the entire shape of a backend API from a plain object literal because its constraint on the `procedures` parameter is…
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