import { CacheService } from "./cache.service.js";
export declare class TranscriptService {
    private cacheService;
    constructor(cacheService: CacheService);
    getTranscriptSegments(videoId: string, lang?: string, format?: "full_text" | "key_segments"): Promise<object | null>;
    private fetchAndCacheRawTranscript;
    private extractHook;
    private extractOutro;
}