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

    The Camera Pan Start Event.

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

    Listen for it via either of the following:

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

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

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