a custom class extends to Object, invoke a member function will produce an error!!!

[rdkmaster]

TypeScript Version: 2.2.1 release

Code

class Base extends Object /* or extends Array */ {
}

class Greeter extends Base {
 greeting: string;
 constructor(message: string) {
 super();
 this.greeting = message;

 this.greet(); // <-- error here
 }
 greet() {
 return "Hello, " + this.greeting;
 }
}

let greeter = new Greeter("world");

let button = document.createElement('button');
button.textContent = "Say Hello";
button.onclick = function() {
 alert(greeter.greet());
}

document.body.appendChild(button);

Expected behavior:
no error while running

Actual behavior:
browser console print this error:

ncaught TypeError: _this.greet is not a function
 at new Greeter (<anonymous>:23:15)
 at <anonymous>:31:15
 at HTMLButtonElement.excuteButton.onclick (http://www.typescriptlang.org/play/playground.js:242)

[rdkmaster]

because of this issue, I have to rollback my ts version to 2.1.x

[rdkmaster]

is this solution recommended? http://stackoverflow.com/questions/12802383/extending-array-in-typescript/43050204#43050204

[gcnew]

See FAQ - Why doesn't extending built-ins like Error, Array, and Map work?

[RyanCavanaugh]

Duplicate #10762; please read the FAQ