Factory Design Pattern in Typescript

Javascript is not enough to implement ordinary factory design patternt that I want to mimic from C#, therefore I try to do it on Typescript, though nested class declaration is still not that straight forward in typescript:

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

class Point {   x: number;   y: number;     private constructor(x: number, y: number) {     this.x = x;     this.y = y;   }     static Factory = class {     static pointXY(x: number, y: number) {       return new Point(x, y);     }     static pointPolar(r: number, theta: number) {       return new Point(         r * Math.cos((theta * Math.PI) / 180),         r * Math.sin((theta * Math.PI) / 180)       );     }   }; }

now we can create our point by calling

?

1	const pt = Point.Factory.pointXY(10, 20);