export declare class LocalAudioLevelMeter {
    private track;
    private onLevel;
    static readonly RMS_VALUE_OF_SILENCE = -99;
    private ctx;
    private node;
    private source;
    private keepAliveGain;
    private stopped;
    constructor(track: MediaStreamTrack, onLevel: (rmsDb: number) => void);
    init(workletUrl: string): Promise<void>;
    stop(): void;
}