declare namespace pc {

    /**
     * @name pc.VrManager
     * @class Manage and update {@link pc.VrDisplay}s that are attached to this device.
     * @description Manage and update {@link pc.VrDisplay}s that are attached to this device.
     * @param {pc.Application} app The main application
     * @property {pc.VrDisplay[]} displays The list of {@link pc.VrDisplay}s that are attached to this device
     * @property {pc.VrDisplay} display The default {@link pc.VrDisplay} to be used. Usually the first in the `displays` list
     * @property {Boolean} isSupported Reports whether this device supports the WebVR API
     * @property {Boolean} usesPolyfill Reports whether this device supports the WebVR API using a polyfill
     */
    class VrManager {
        constructor(app: pc.Application)

        displays: pc.VrDisplay[];
        display: pc.VrDisplay;
        static isSupported: boolean;
        static usesPolyfill: boolean;

        /**
         * @function
         * @name pc.VrManager#destroy
         * @description Remove events and clear up manager
         */
        destroy(): void;

        /**
         * @function
         * @name pc.VrManager#poll
         * @description Called once per frame to poll all attached displays
         */
        poll(): void;


        // Events

        /**
         * @function
         * @name pc.VrManager#on
         * @description Attach an event handler to an event
         * @param {String} name Name of the event to bind the callback to
         * @param {Function} callback Function that is called when event is fired. Note the callback is limited to 8 arguments.
         * @param {Object} [scope] Object to use as 'this' when the event is fired, defaults to current this
         * @example
         * obj.on('test', function (a, b) {
         *     console.log(a + b);
         * });
         * obj.fire('test', 1, 2); // prints 3 to the console
         */
        on(name: string, callback: (...args: any[]) => void, scope: any): any;

        /**
         * @function
         * @name pc.VrManager#off
         * @description Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event,
         * if scope is not provided then all events with the callback will be unbound.
         * @param {String} [name] Name of the event to unbind
         * @param {Function} [callback] Function to be unbound
         * @param {Object} [scope] Scope that was used as the this when the event is fired
         * @example
         * var handler = function () {
         * };
         * obj.on('test', handler);
         *
         * obj.off(); // Removes all events
         * obj.off('test'); // Removes all events called 'test'
         * obj.off('test', handler); // Removes all handler functions, called 'test'
         * obj.off('test', handler, this); // Removes all hander functions, called 'test' with scope this
         */
        off(name: string, callback: (...args: any[]) => void, scope: any): any;

        /**
         * @function
         * @name pc.VrManager#fire
         * @description Fire an event, all additional arguments are passed on to the event listener
         * @param {Object} name Name of event to fire
         * @param {*} [...] Arguments that are passed to the event handler
         * @example
         * obj.fire('test', 'This is the message');
         */
        fire(name: string, arg1: any, arg2?: any, arg3?: any, arg4?: any, arg5?: any, arg6?: any, arg7?: any, arg8?: any): any;

        /**
         * @function
         * @name pc.VrManager#once
         * @description Attach an event handler to an event. This handler will be removed after being fired once.
         * @param {String} name Name of the event to bind the callback to
         * @param {Function} callback Function that is called when event is fired. Note the callback is limited to 8 arguments.
         * @param {Object} [scope] Object to use as 'this' when the event is fired, defaults to current this
         * @example
         * obj.once('test', function (a, b) {
         *     console.log(a + b);
         * });
         * obj.fire('test', 1, 2); // prints 3 to the console
         * obj.fire('test', 1, 2); // not going to get handled
         */
        once(name: string, callback: (...args: any[]) => void, scope: any): any;

        /**
        * @function
        * @name pc.VrManager#hasEvent
        * @description Test if there are any handlers bound to an event name
        * @param {String} name The name of the event to test
        * @example
        * obj.on('test', function () { }); // bind an event to 'test'
        * obj.hasEvent('test'); // returns true
        */
        hasEvent(name: string): boolean;
    }
}