type AudioLevelCallback = (volume: number) => void;
type ErrorCallback = (errorMsg: string) => void;
/**
 * Observes the volume level for a given participant.
 * @param id The session_id of the participant to observe.
 * @param cb The function to execute when the volume changes. Can be used to visualise audio output.
 * @param errorCb Error callback. Called when local audio level observer is not available in browser.
 * @param interval Callbacks will be executed at this freqency. If unspecified, Daily's default frequency is used.
 */
export declare const useAudioLevelObserver: (id: string, cb: AudioLevelCallback, errorCb?: ErrorCallback, interval?: number) => void;
export {};