/**
 * `useTrack` is a hook that retrieves the track method from a Split client.
 *
 * @returns The track method of the Split client for the provided user key. If the client is not available, the result is a no-op function that returns false.
 *
 * @see {@link https://help.split.io/hc/en-us/articles/360020448791-JavaScript-SDK#track}
 */
export declare function useTrack(splitKey?: SplitIO.SplitKey): SplitIO.IBrowserClient['track'];