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

    The Key Up Event.

    This event is dispatched by a [Key]Phaser.Input.Keyboard.Key object when it is released.

    Listen for this event from the Key object instance directly:

    var spaceBar = this.input.keyboard.addKey(Phaser.Input.Keyboard.KeyCodes.SPACE);

    spaceBar.on('up', listener)

    You can also create a generic 'global' listener. See [Keyboard.Events.ANY_KEY_UP]Phaser.Input.Keyboard.Events#event:ANY_KEY_UP for details.