Web Reference: TypeScript uses type annotations to specify explicit types for identifiers such as variables, functions, objects, etc. TypeScript uses the syntax : type after an identifier as the type annotation, which type can be any valid type. Functions Functions are the primary means of passing data around in JavaScript. TypeScript allows you to specify the types of both the input and output values of functions. Parameter Type Annotations When you declare a function, you can add type annotations after each parameter to declare what types of parameters the function accepts. Sep 9, 2025 · Type annotations in TypeScript are used to explicitly specify the type of a variable, function parameter, or object property. This helps catch errors early, improves code readability, and ensures type safety.
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