let x: number;
const name: string = "hello";
var flag: boolean = true;
let anything: any = 42;
let nothing: never;
let mystery: unknown = getValue();
let obj: object = {};
let sym: symbol = Symbol("id");
let big: bigint = 100n;

function greet(name: string, age: number): string {
  return `Hello ${name}, age ${age}`;
}

const add = (a: number, b: number): number => a + b;

function process(input: string | number): void {
  console.log(input);
}
