/**
 * How much the player has buffered ahead of its playhead, read through the analytics adapter the
 * integrator registered: its playhead and the media element behind its player. Best effort, never
 * throws; null when nothing usable is registered (the trial deadline then uses the chunk duration).
 */
export declare function mediaElementOf(player: unknown): HTMLMediaElement | null;
/** Seconds buffered ahead of `playheadS` in `buffered`, 0 when the playhead sits in no range. */
export declare function secondsAhead(buffered: TimeRanges, playheadS: number): number;
/** Reads the buffer ahead from one adapter (its `player` and `getPlayhead()`), or null. */
export declare function bufferAheadFromAdapter(adapter: unknown): number | null;