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

    The Key Up Event.

    This event is dispatched by the Keyboard Plugin when any key on the keyboard is released.

    Unlike the ANY_KEY_UP event, this one has a special dynamic event name. For example, to listen for the A key being released use the following from within a Scene: this.input.keyboard.on('keyup-A', listener). You can replace the -A part of the event name with any valid [Key Code string]Phaser.Input.Keyboard.KeyCodes. For example, this will listen for the space bar: this.input.keyboard.on('keyup-SPACE', 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.

    Finally, you can create Key objects, which you can also listen for events from. See [Keyboard.Events.UP]Phaser.Input.Keyboard.Events#event:UP for details.