/** @class _WindowScope
* @hideconstructor
* @example
PIXI global convenience aliases
-------------------------------
These variables are defined in the `window`
- `Sprite` PIXI.Sprite
- `Point` PIXI.Point
- `Rectangle` PIXI.Rectangle
- `Text` PIXI.Text
- `Graphics` PIXI.Graphics
- `Container` PIXI.Container
- `loader` PIXI.Loader.shared
- `resources` loader.resources
- `ticker` PIXI.Ticker.shared
*/