export declare const formatTime: (seconds: number) => string;
export declare const updateRangeBackground: (ref: HTMLInputElement | null, defaultValue?: number, maxVal?: number) => void;
export declare const getYouTubeVideoId: (url: string) => string | null;
export declare const isYouTubeUrl: (url: string) => boolean;
export declare const playbackRateOptions: number[];