import type { BasePlaylistItem, Chapter } from '@nomercy-entertainment/nomercy-player-core';
import type { IChapterSource } from './IChapterSource.js';
/**
 * Default chapter source. Reads chapters from the item's typed `chapters`
 * array when the consumer pre-populates it directly.
 *
 * VTT chapter cue format expected:
 *   ```
 *   00:00:00.000 --> 00:04:30.000
 *   Opening
 *   ```
 *
 * This is the format produced by the NoMercy media-server chapter extractor
 * and is compatible with standard WebVTT chapter tooling.
 */
export declare class VttChapterSource implements IChapterSource {
    private _chapters;
    load(item: BasePlaylistItem): Promise<Chapter[]>;
    current(timeSeconds: number): Chapter | null;
    all(): Chapter[];
    unload(): void;
}