TypeScript: extends Array class example

collection.ts

'use strict';
class Collection<T> extends Array<T> {
  // noinspection JSAnnotator
  public constructor(...args: T[]) {
    let array = super(...args);
    
    Object.setPrototypeOf(array, this.constructor.prototype);
    
    return array;
  }
  
  public print() {
    alert(JSON.stringify(this));
  }
}

let a = [1, 2, 3];
let b = new Collection<number>(...a);

b.print();

This is not work