import type { Harker } from 'hark';
import type { Volume } from '../types';
import { EventEmitter } from 'eventemitter-strict';
interface VolumeWatcherEventMap {
    volumeChange: ({ volume, scaledVolume }: Volume) => void;
}
export declare class VolumeWatcher extends EventEmitter<VolumeWatcherEventMap> {
    private hark;
    private lastVolume;
    private lastScaledVolume;
    constructor({ hark }: {
        hark: Harker;
    });
    private handleHark;
}
export {};