function init ()
{
    if (typeof importScripts === 'function')
    {
        return Input;
    }

    if ('ontouchstart' in document.documentElement || (navigator.maxTouchPoints && navigator.maxTouchPoints >= 1))
    {
        Input.touch = true;
    }

    if (navigator.msPointerEnabled || navigator.pointerEnabled)
    {
        Input.mspointer = true;
    }

    if (navigator.getGamepads)
    {
        Input.gamepads = true;
    }

    // See https://developer.mozilla.org/en-US/docs/Web/Events/wheel
    if ('onwheel' in window || (Browser.ie && 'WheelEvent' in window))
    {
        // DOM3 Wheel Event: FF 17+, IE 9+, Chrome 31+, Safari 7+
        Input.wheelEvent = 'wheel';
    }
    else if ('onmousewheel' in window)
    {
        // Non-FF legacy: IE 6-9, Chrome 1-31, Safari 5-7.
        Input.wheelEvent = 'mousewheel';
    }
    else if (Browser.firefox && 'MouseScrollEvent' in window)
    {
        // FF prior to 17. This should probably be scrubbed.
        Input.wheelEvent = 'DOMMouseScroll';
    }

    return Input;
}
Determines the input support of the browser running this Phaser Game instance.
These values are read-only and populated during the boot sequence of the game.
They are then referenced by internal game systems and are available for you to access
via `this.sys.game.device.input` from within any Scene.

@typedef {object} Phaser.Device.Input
@since 3.0.0

@property {?string} wheelType - The newest type of Wheel/Scroll event supported: 'wheel', 'mousewheel', 'DOMMouseScroll'
@property {boolean} gamepads - Is navigator.getGamepads available?
@property {boolean} mspointer - Is mspointer available?
@property {boolean} touch - Is touch available?