phaser - v4.0.0-rc.4
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    Variable TWEEN_STARTConst

    TWEEN_START: string

    The Tween Start Event.

    This event is dispatched by a Tween when it starts tweening its first property.

    A Tween will only emit this event once, as it can only start once.

    If a Tween has a delay set, this event will fire after that delay expires.

    Listen to it from a Tween instance using Tween.on('start', listener), i.e.:

    var tween = this.tweens.add({
    targets: image,
    x: 500,
    ease: 'Power1',
    duration: 3000
    });
    tween.on('start', listener);