/**
 * If given a list of objects, this method removes all "private" attributes from each object. If given an object, it
 * cleans the "private" attributes from this object. "Private" means attributes whose names start with "$". Does not
 * modify the given array, its objects or the given object.
 * @param {Object | Object[]} payload
 * @param {RegExp} privatePattern
 * @returns {Object | Object[]}
 */
export declare function clean<T>(payload: T, privatePattern?: RegExp): T;
/**
 * Removes all "private" attributes from each object, meaning all attributes whose names start with "$". Does not modify
 * the original array and its objects.
 * @param {Object[]} payload Objects to clean
 * @param {RegExp} privatePattern
 * @returns {Object[]}
 */
export declare function cleanList<T extends Array<any>>(payload: T, privatePattern?: RegExp): T;
/**
 * Removes all "private" attributes from an object, meaning all attributes whose names start with "$". Does not modify
 * the original object.
 * @param {Object} payload Object to clean
 * @param {RegExp} privatePattern
 * @returns {Object} Cleaned object
 */
export declare function cleanObject<T extends Object>(payload: T, privatePattern?: RegExp): T;
/**
 * Makes a deep clone of the given object.
 * @param {T} obj
 * @returns {T}
 */
export declare function clone<T>(obj: T): T;
/**
 * Checks if the given object is a promise-like object (meaning that it has a `then` method).
 * @param obj Object to check
 * @returns {boolean} Is promise-like?
 */
export declare function isPromiseLike(obj: any): boolean;