Source: math/RectangleType.js

/**
 * <pre>
 *  Rectangle
 *    - getBounds() results use width / height as the right / bottom edge coordinates, not the size
 * </pre>
 * @typedef {Object} Rectangle
 * @property {number} x
 * @property {number} y
 * @property {number} width
 * @property {number} height
 */