/**
 * Regular expressions and constants used for YouTube transcript fetching
 */
export declare const CONSTANTS: {
    /** Matches YouTube video URLs and extracts the video ID */
    VIDEO_ID_REGEX: RegExp;
    /** User agent string for making requests */
    USER_AGENT: string;
    /** Matches transcript XML format and extracts timing and text */
    TRANSCRIPT_XML_REGEX: RegExp;
};