/**
 * YouTube API Handler
 *
 * Extracts video information from youtube.com using oEmbed API.
 * Enhanced data available with YOUTUBE_API_KEY environment variable.
 */
import { BaseSiteHandler, type FetchFunction, type SiteHandlerOptions, type SiteHandlerResult } from './types.js';
export declare class YouTubeHandler extends BaseSiteHandler {
    readonly name = "YouTube";
    readonly strategy: "api:youtube";
    canHandle(url: string): boolean;
    extract(url: string, fetch: FetchFunction, opts: SiteHandlerOptions): Promise<SiteHandlerResult | null>;
    /**
     * Extract video ID from YouTube URL
     */
    private getVideoId;
    /**
     * Fetch YouTube oEmbed data
     */
    private fetchOEmbed;
    /**
     * Fetch enhanced data from YouTube Data API v3
     * Requires YOUTUBE_API_KEY env var
     */
    private fetchDataAPI;
    /**
     * Format YouTube data into content result
     */
    private formatVideoData;
    /**
     * Convert ISO 8601 duration (PT1H2M3S) to human-readable format
     */
    private formatDuration;
}
export declare const youtubeHandler: YouTubeHandler;
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