2.0.0-beta.2 fails to new Stage

[MarvinWilliam]

TODO

• [x] Is this a question or bug? Stack Overflow is a much better place to ask any questions you may have.

• [x] Did you search the issues to see if someone else has already reported your issue? If yes, please add more details if you have any!

• [x] If you're using an older version, have you tried the latest?

• [ ] If you're requesting a new feature; provide as many details as you can. Why do you want this feature? Do you have ideas for how this feature should be implemented? Pseudocode is always welcome!

Issue Details

• Version used (Ex; 1.0): 2.0.0-beta.2

• Describe whats happening (Include any relevant console errors, a Gist is preferred for longer errors):

import { Stage } from '@createjs/easeljs';

export default class Canvas {
    constructor() {
        this.stage = new Stage('canvasId');
    }
}

Error:

easeljs.module.js:1904 Uncaught TypeError: Illegal constructor
    at createCanvas (easeljs.module.js:1904)
    at Object../node_modules/@createjs/easeljs/dist/easeljs.module.js (easeljs.module.js:3160)
    at __webpack_require__ (bootstrap 8cba5b6e973429fc89a0:678)

code where throw error

function createCanvas(width = 1, height = 1) {
  let c;
  if (window.createjs !== undefined && window.createjs.createCanvas !== undefined) {
    c = window.createjs.createCanvas();
  }
  if (HTMLCanvasElement) {
    // this line throw error "Illegal constructor"
    c = new HTMLCanvasElement();
  }
  if (c !== undefined) {
    c.width = width;
    c.height = height;
    return c;
  }
  throw "Canvas not supported in this environment.";
}

• OS & Browser version (Please be specific) (Ex; Windows 10 Home, Chrome 62.0.3202.94): Chrome Version 69.0.3497.100 (Official Build) (64-bit)

• Do you know of any workarounds? HTMLCanvasElement is sub interface of HTMLElement, it should not be used as constructor

• Provide any extra details that will help us fix your issue. Including a link to a CodePen.io or JSFiddle.net example that shows the issue in isolation will greatly increase the chance of getting a quick response.

[MarvinWilliam]

This my pr for this issue. https://github.com/CreateJS/EaselJS/pull/988#issue-219197170

[txiaocao]

这个问题依然存在，使得无法在浏览器当中使用easeljs@2.0.0-beta3。什么时候能够发布一个新的版本修复这个问题呢？

This problem still exists, which makes it impossible to use easeljs@2.0.0-beta3 in browsers. When can we release a new version to fix this problem?

[tehvgg]

Fixed in beta.4