Parameter

🧩 Parameters<T>

Parameters<T> extracts the parameter types of a function and returns them as a tuple.

🔹 Example

function createUser(name: string, age: number) {
  return {
    name,
    age
  };
}

type UserParams = Parameters<typeof createUser>;

TypeScript infers:

type UserParams = [name: string, age: number];

You can use it like this:

const params: UserParams = ["Bhaskar", 25];

createUser(...params);

💡 Common Use

Parameters is useful when you want to reuse the parameter types of an existing function, especially with callbacks and utility functions.

Remember: Parameters<T> → Gets a function's parameter types as a tuple.