phaser - v4.0.0-rc.4
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    FLASH_COMPLETE: string

    The Camera Flash Complete Event.

    This event is dispatched by a Camera instance when the Flash Effect completes.

    Listen for it via either of the following:

    this.cameras.main.on('cameraflashcomplete', () => {});
    

    or use the constant, to avoid having to remember the correct event string:

    this.cameras.main.on(Phaser.Cameras.Scene2D.Events.FLASH_COMPLETE, () => {});