/**
 * The MMLDocumentTimeManager class is responsible for tracking the current document time and notifying listeners of
 * either shifts in time (e.g. media synced to time) and also ticking (e.g. for elements that are animating) when the
 * document time changes.
 */
export declare class MMLDocumentTimeManager {
    private relativeDocumentStartTime;
    private overridenDocumentTime;
    private documentTimeListeners;
    private documentTimeTickListeners;
    constructor();
    tick(): void;
    getDocumentTime(): number;
    getWindowTime(): number;
    addDocumentTimeListenerCallback(cb: (time: number) => void): void;
    removeDocumentTimeListenerCallback(cb: (time: number) => void): void;
    addDocumentTimeTickListenerCallback(cb: (time: number) => void): void;
    removeDocumentTimeTickListenerCallback(cb: (time: number) => void): void;
    setDocumentTime(documentTime: number): void;
    overrideDocumentTime(documentTime: number): void;
}
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