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

    The Gamepad Button Up Event.

    This event is dispatched by a Gamepad instance when a button has been released on it.

    Listen to this event from a Gamepad instance. Once way to get this is from the pad1, pad2, etc properties on the Gamepad Plugin: this.input.gamepad.pad1.on('up', listener).

    Note that you will not receive any Gamepad button events until the browser considers the Gamepad as being 'connected'.

    You can also listen for an UP event from the Gamepad Plugin. See the [BUTTON_UP]Phaser.Input.Gamepad.Events#event:BUTTON_UP event for details.