import type { CaptionResource } from './types';
/** A TextTrack-like row (real DOM TextTrack or a VAST-derived stand-in). */
type TrackLike = {
    kind?: unknown;
    language?: unknown;
    srclang?: unknown;
    label?: unknown;
    mode?: unknown;
};
/** Minimal structural view of something that exposes a `textTracks` collection. */
type TextTrackSource = {
    textTracks?: (ArrayLike<TrackLike> & {
        item?(i: number): TrackLike | null;
    }) | null;
};
export declare class CaptionManager {
    private adTrackEls;
    private prevActiveCaptionSig;
    captionsSignature(t: TrackLike | null | undefined): string;
    listCaptionTracks(media: TextTrackSource | null | undefined): TrackLike[];
    captureActiveCaptionTrack(media: TextTrackSource | null | undefined): void;
    restoreActiveTextTrack(media: HTMLMediaElement | undefined): void;
    ensureRawCaptions(mediaFileRaw: unknown, creative?: unknown): CaptionResource[];
    attachAdCaptionTracks(adVideo: HTMLVideoElement, mediaFileRaw: unknown, creative?: unknown): HTMLTrackElement[];
    clearAdTracks(): void;
    removeAdCaptions(): void;
}
export {};
//# sourceMappingURL=caption-manager.d.ts.map