I don't think there is a way to inherit existing interfaces like Array,

export class Xarray implements Array {



}

You should create a function and inherit it with its prototype. Typescript also will accept it which is similar to javascript.

function Xarray(...args: any[]): void; // required in TS 0.9.5

function Xarray()

{

    Array.apply(this, arguments);

   // some stuff for insert, add and remove notification

}

Xarray.prototype = new Array();

UPDATE: This one is discussed well and provided the best solution for this at jqfaq.com.

//a dummy class it to inherite array.

class XArray {

    constructor() {

        Array.apply(this, arguments);   

        return new Array();

    }

    // we need this, or TS will show an error,

    //XArray[prototype] = new Array(); will replace with native js arrray function

    pop(): any { return  };

    push(val): number { return 0; };

    length: number;

}

//Adding Arrray to XArray prototype chain.

XArray[prototype] = new Array();



//our Class

class YArray extends XArray {

///Some stuff

}



var arr = new YArray();

//we can use the array prop here.

arr.push(one);

arr.push(two);



document.writeln(First Elemet in array :  + arr[0]);

document.writeln(</br>Array Lenght :  + arr.length);

Hope, this might help you!!!