TypeScript

interface

interface TQ84 {
   id  :  number;
   text:  string;
};

let tq84 : TQ84 = {
   id  :  42,
   text: 'hello world'
};

class

class TQ84 {
   id  :  number;
   text:  string;

   constructor(id: number, text: string) {
      this.id   = id;
      this.text = text;
   }
};

let tq84 : TQ84 = new TQ84(42, 'Hello world');

console.log(tq84.id);

Unions

type phase =
       'initialized' |
       'in-progress' |
       'waiting'     |
       'closed';

let prjPhase : phase = 'in-progress';

Generics

function ident<T>(val: T): T {
    return val;
}

Decorators

const deco = (cls: new() => CLS_1): void => {
   console.log(cls);
}

class BASE {}

@deco
class CLS_1 extends BASE {}

Command-line Options

JavaScript Support

Interop Constraints

Modules

Type Checking

Watch and Build Modes

Backwards Compatibility

Projects

Emit

Compiler Diagnostics

Editor Support

Language and Environment

Output Formatting

Completeness

Watch options

Build options