/**
 * Utility functions for YouTube subtitle extraction
 */
/**
 * Extract video ID from YouTube URL
 */
export declare function extractVideoId(url: string): string;
/**
 * Format timestamp (milliseconds) to SRT format
 */
export declare function formatSRTTime(ms: number): string;
/**
 * Format timestamp (milliseconds) to VTT format
 */
export declare function formatVTTTime(ms: number): string;
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