Definition

A strongly typed superset of JavaScript that compiles to plain JS. Adds static type checking, interfaces, generics and enums to catch errors at compile time rather than runtime.

Also

Developed by Microsoft. First released in 2012. Now the de facto standard for large-scale JavaScript applications.

Example

// Without TypeScript
function greet(name) { return "Hello " + name; }

// With TypeScript
function greet(name: string): string {
  return `Hello ${name}`;
}

See also