Learn how to replace runtime validation with TypeScript intersection types for compile-time safety and cleaner code.

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TypeScript intersection types enable compile-time validation by combining multiple types into one that satisfies all constraints. Instead of runtime checks that throw errors when properties are missing, intersection types like `User & { email: string }` enforce requirements at the type level, catching errors during development. This approach simplifies code by eliminating runtime validation logic, though public libraries should still include runtime checks since TypeScript types are erased at runtime.

How Intersection Types Replace Error Handling