Web Reference: Sep 16, 2025 · This tutorial will show you how to use custom types with TypeScript, how to compose those types together with unions and intersections, and how to use utility types to add flexibility to your custom types. Jul 26, 2018 · You can't use typeof at runtime to check for interface types, which only exist at compile time. Instead you can write a user-defined type guard function to check for such types: Jul 23, 2025 · Checking types in TypeScript involves methods like typeof for primitive types, instanceof for class instances, and custom type guards for complex type validation.
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