/**
 * <p>Helper function to call any of the 3 forms of eventual callback: </p>
 *
 * <code>(), (error) and (error, message)</code>
 *
 * <p>NOTE: This helper will not handle null callbacks. You should check
 * if the callback is null from the calling location: </p>
 *
 * <code>callback &amp;&amp; safelyCallBack(callback, error, message);</code>
 *
 * <p>This prevents the overhead of calling safelyCallBack()
 * when there is no callback to call. Likewise it reduces the overhead
 * of a null check in safelyCallBack().</p>
 *
 * <p>QUESTION: Is this too harsh? Should we protect from null?</p>
 *
 * @param callback The actual callback
 * @param error An optional error
 * @param message An optional message
 */
export declare function safelyCallBack(callback: Function, error?: any, message?: any): void;