/**
 * Subtitle format converters
 */
export interface TranscriptItem {
    text: string;
    offset: number;
    duration: number;
}
/**
 * Convert transcript to SRT format
 */
export declare function convertToSRT(transcript: TranscriptItem[]): string;
/**
 * Convert transcript to VTT format
 */
export declare function convertToVTT(transcript: TranscriptItem[]): string;
/**
 * Convert transcript to plain text format
 */
export declare function convertToTXT(transcript: TranscriptItem[]): string;
/**
 * Convert transcript to JSON format
 */
export declare function convertToJSON(transcript: TranscriptItem[]): string;
/**
 * Format subtitles to specified format
 */
export declare function formatSubtitles(transcript: TranscriptItem[], format: string): string;
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