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

    The Camera Zoom Start Event.

    This event is dispatched by a Camera instance when the Zoom Effect starts.

    Listen for it via either of the following:

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

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

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