TypeError: _super.call is not a function(…)

GUILayout.js

// Generated JS file

var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
define(["require", "exports", './GUIElement'], function (require, exports, GUIElement) {
    var GUILayout = (function (_super) {
        __extends(GUILayout, _super);
        /**
         * Constructor
         * @param name layout name
         * @param app App instance
         */
        function GUILayout(name, app) {
            _super.call(this, name, app);
            
        }
    }
    
    [...]

GUILayout.ts

import GUIElement = require('./GUIElement');

class GUILayout extends GUIElement implements IGUILayout {
    // Public members
    public panels: Array<GUIPanel> = new Array<GUIPanel>();

    /**
     * Constructor
     * @param name layout name
     * @param app App instance
     */
    constructor(name: string, app: App) {
        super(name, app);
    }
}