Can you express the dependence on types when parsing input in TypeScript?

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Yes, it is important to declare the types of the expected input parameters when parsing input in TypeScript. This ensures that the input is of the correct type and minimizes the likelihood of runtime errors. Additionally, TypeScript can provide more helpful error messages during development and increase the readability and maintainability of the code.

For example, when parsing a string as a number, the input parameter can be declared with the number type as follows:

function parseInputNumber(input: string): number {
  return parseInt(input, 10);
}

Similarly, when parsing an array of objects, the input type can be declared with an interface that defines the expected properties of each object:

interface User {
  name: string;
  age: number;
}

function parseInputUsers(input: any[]): User[] {
  return input.map((user) => ({
    name: user.name,
    age: parseInt(user.age, 10),
  }));
}