The foundational guide to mastering TypeScript. Learn how the type inference engine works, master type narrowing with typeof, instanceof, in, and custom type predicates (is), build type-safe discriminated unions, and use as const assertions.
An in-depth introduction to Generics in TypeScript. Learn how type parameters (<T>) bridge reusable logic with strict type safety, generic type inference, generic interfaces (ApiResponse<T>), and generic classes.
Understand the type-system mechanics of top types in TypeScript. Learn why ‘any’ disables type checking and causes type contagion, why ‘unknown’ provides safe dynamic typing, and how to use ‘unknown’ with runtime validation.
