export declare function range(length: number): number[];
export declare function sleep(ms: number): Promise<unknown>;
export declare function iceParse(ice: string[], enableTCP?: boolean): RTCIceServer[];
export declare function isTouch(): boolean;
export declare function isIOS(): boolean;
export declare function isAndroid(): boolean;
export declare function stringifyQuery(query: any): string;
export declare function takeScreenshotUrl(videoElement: HTMLVideoElement, opt: {
    accuracy: number;
    alpha: number;
}): string;
export declare function downloadFile(data: Blob, fileName?: string): void;
export declare const forbiddenRegex: RegExp;
export declare function isValidFullPath(path: string): boolean;
export declare const map2Ary: <T extends string | number, R>(map: Map<T, R>, predicate: (value: R) => string) => Option<T>[];