Description: The assertion function in TypeScript is a powerful tool that allows developers to verify and validate types at runtime. Its main goal is to ensure that the values being used in the code meet the type expectations defined in TypeScript’s type system. When an assertion function is invoked, it evaluates the type of the provided argument and, if it does not match the expected type, throws an error. This helps prevent runtime errors that could arise from unexpected or incorrect values. Assertion functions are especially useful in large and complex applications, where type management can become tricky. By using these functions, developers can enhance the robustness and maintainability of the code, as they facilitate the identification of type-related issues before they become production errors. In summary, assertion functions are an integral part of safe and efficient programming in TypeScript, providing an additional layer of verification that complements the language’s static type system.
