declare class DevicePixelRatioObserver {
    private mediaQueryString;
    private mediaQuery;
    private eventEmitter;
    constructor();
    destroy(): void;
    on(event: string, func: (...args: any[]) => void): void;
    off(event: string, func: (...args: any[]) => void): void;
    private onPixelRatioChanged;
}
declare const devicePixelRationObserver: DevicePixelRatioObserver;
export default devicePixelRationObserver;