export declare class GrpcAudioRecorder {
    private static SAMPLE_RATE_HZ;
    private static BUFFER_SIZE_BYTES;
    private static INTERVAL_TIMEOUT_MS;
    private currentMediaStream;
    processor: ScriptProcessorNode | null;
    private leftChannel;
    private recordingLength;
    private interval;
    private listener;
    stopConvertion(): void;
    isRecording(): boolean;
    startConvertion(stream: MediaStream, listener: (chunk: string) => void): Promise<void>;
    private mergeBuffers;
    private onAudioProcess;
    private intervalFunction;
    private arrayBufferToBase64;
}