/**
 * @callback Phaser.Types.Scenes.SceneTransitionOnStartCallback
 * @since 3.60.0
 *
 * @this Phaser.Scene
 * @param {Phaser.Scene} fromScene - Scene instance to transition from.
 * @param {Phaser.Scene} toScene - Scene instance to transition to.
 * @property {number} [duration=1000] - The duration, in ms, for the transition to last.
 */
