export declare function addMatchMediaChangeListener(targetWindow: Window, query: string | MediaQueryList, callback: (this: MediaQueryList, ev: MediaQueryListEvent) => unknown): void;
/** The zoom scale for an index, e.g. 1, 1.2, 1.4 */
export declare function getZoomFactor(targetWindow: Window): number;
export declare const isFirefox: boolean;
export declare const isWebKit: boolean;
export declare const isChrome: boolean;
export declare const isSafari: boolean;
export declare const isWebkitWebView: boolean;
export declare const isElectron: boolean;
export declare const isAndroid: boolean;
export declare function isStandalone(): boolean;