Uncaught TypeError: Class constructor Shape cannot be invoked without 'new'

[teamco]

`class Colored { initializer () { this._color = "white" } get color () { return this._color } set color (v) { this._color = v } }

class ZCoord { initializer () { this._z = 0 } get z () { return this._z } set z (v) { this._z = v } }

class Shape { constructor (x, y) { this._x = x; this._y = y } get x () { return this._x } set x (v) { this._x = v } get y () { return this._y } set y (v) { this._y = v } }

class Rectangle extends aggregation(Shape, Colored, ZCoord) {} new Rectangle(5,6)`

Uncaught TypeError: Class constructor Shape cannot be invoked without 'new' at new __Aggregate (aggregation-es6.js:31) __Aggregate @ aggregation-es6.js:31