/**
 * YouTube metadata generation — title / description / tags / chapters.
 *
 * One LLM call, transcript in, complete metadata out. The LLM is
 * instructed to derive chapters from REAL topic shifts (not fabricated
 * ones) and to keep titles ≤70 chars (YouTube truncates above that on
 * mobile).
 */
import type { Transcript } from "./whisper.js";
export interface YouTubeChapter {
    atSec: number;
    title: string;
}
export interface YouTubeMetadata {
    titles: string[];
    description: string;
    tags: string[];
    chapters: YouTubeChapter[];
    hashtags: string[];
}
export interface MetadataOptions {
    apiKey?: string;
    model?: string;
    channelStyle?: string;
    videoTopic?: string;
    signal?: AbortSignal;
}
export declare function generateMetadata(t: Transcript, opts?: MetadataOptions): Promise<YouTubeMetadata>;
/**
 * Robust parser. Tolerates prose around the JSON, missing keys, mistyped
 * arrays. Mirrors `parseHookVisionResponse` in spirit.
 */
export declare function parseMetadataResponse(content: string): YouTubeMetadata;
/**
 * Apply the hard constraints we promise downstream:
 *   - titles: max 3, each truncated to 70 chars
 *   - tags: exactly 15 (slice or pad — pad with empty filtered out)
 *   - chapters: drop if duration < 5 min; first must be at 00:00; adjacent ≥30s
 *   - hashtags: 3-5 entries
 *
 * Pure — exported for testing.
 */
export declare function enforceMetadataConstraints(m: YouTubeMetadata, durationSec: number): YouTubeMetadata;
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