phaser - v4.0.0-rc.4
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    Variable TRANSITION_STARTConst

    TRANSITION_START: string

    The Scene Transition Start Event.

    This event is dispatched by the Target Scene of a transition, only if that Scene was not asleep.

    It happens immediately after the Scene.create method is called. If the Scene does not have a create method, this event is dispatched anyway.

    If the Target Scene was sleeping then the [TRANSITION_WAKE]Phaser.Scenes.Events#event:TRANSITION_WAKE event is dispatched instead of this event.

    Listen to it from a Scene using this.events.on('transitionstart', listener).

    The Scene Transition event flow is as follows:

    1. [TRANSITION_OUT]Phaser.Scenes.Events#event:TRANSITION_OUT - the Scene that started the transition will emit this event.
    2. [TRANSITION_INIT]Phaser.Scenes.Events#event:TRANSITION_INIT - the Target Scene will emit this event if it has an init method.
    3. [TRANSITION_START]Phaser.Scenes.Events#event:TRANSITION_START - the Target Scene will emit this event after its create method is called, OR ...
    4. [TRANSITION_WAKE]Phaser.Scenes.Events#event:TRANSITION_WAKE - the Target Scene will emit this event if it was asleep and has been woken-up to be transitioned to.
    5. [TRANSITION_COMPLETE]Phaser.Scenes.Events#event:TRANSITION_COMPLETE - the Target Scene will emit this event when the transition finishes.