A complete reference to TypeScript built-in utility types with real backend examples. Master Partial, Pick, Omit, Record, Extract, and advanced custom patterns used in production APIs.
Mapped types let you generate new types by transforming existing ones. This guide covers key remapping, modifier stripping, conditional filtering, deep utilities, and real backend patterns for eliminating type duplication.
Template literal types let TypeScript reason about string patterns at compile time. Learn how to generate event names, build route types, validate string formats, and create type-safe APIs using template literals.