TypeScript

 TypeScript

TypeScript is a superset of JavaScript that adds static typing and other features to help catch errors at compile time instead of runtime. Here's an example of using TypeScript to create a function that takes two numbers and returns their sum:

function addNumbers(a: number, b: number): number {

  return a + b;

}

In this code, we're using the : number syntax to specify that the function should return a number. We're also using the : number syntax to specify that both a and b should be numbers. If we try to pass a non-number to this function, TypeScript will give us an error at compile time instead of letting the error happen at runtime.