/**
 * Copyright (c) Double Symmetry GmbH
 * Commercial use requires a license. See https://rntp.dev/pricing
 */
export interface SleepTimerHooks {
    pause(): void;
    /** Persisted player volume — the fade's restore target. */
    getVolume(): number;
    /** Transient engine-level volume (does NOT change the persisted player volume). */
    setEngineVolume(volume: number): void;
    onTriggered(type: 'time' | 'mediaItem'): void;
}
export declare class SleepTimerController {
    private hooks;
    private state;
    private timeout;
    private fadeStartTimeout;
    private fadeInterval;
    private fading;
    constructor(hooks: SleepTimerHooks);
    sleepAfterTime(seconds: number, fadeOutSeconds: number): void;
    sleepAfterMediaItemAtIndex(index: number): void;
    /** Called by WebTrackPlayer when an item finishes, BEFORE auto-advancing. */
    notifyItemEnded(canonicalIndex: number): void;
    getState(): {
        type: 'time';
        remainingSeconds: number;
        fadeOutSeconds: number;
    } | {
        type: 'mediaItem';
        index: number;
    } | null;
    cancel(): void;
    destroy(): void;
    private trigger;
    private clearTimers;
}
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