Wat zijn het basis types in TypeScript?

let name: string = "Jan";
let age: number = 30;
let active: boolean = true;

let items: string[] = ["a", "b"];
let tuple: [string, number] = ["test", 42];

// Don't use 'any'
// let unknown: any = value;

// Use 'unknown' instead
let unknownValue: unknown = value;
if (typeof unknownValue === 'string') {
  console.log(unknownValue.toUpperCase());
}