/**
 * Determines whether an object has a property with the specified name.
 *
 * @param {Object} object
 * @param {string} key
 * @returns {boolean} True or false
 */
export declare const isValidKey: (object: Object, key: string) => boolean;
/**
 * Iterates over elements of `objects`, returning a objects of all elements
 * `predicate` returns truthy for.
 *
 * @param {Object.<string, any>} objects The Objecs *with key-value pairs* to iterate over.
 * @param {Function} predicate The function invoked per iteration.
 * @returns {Object.<string, any>} Returns the new filtered objects *with key-value pairs*.
 *
 * @example
 *
 * const users = {
 *  'barney': { 'name': 'barney', 'active': true },
 *  'fred':   { 'name': 'fred',   'active': false }
 * }
 *
 * filterObjects(users, ({ active }) => active)
 * // => {
 * //   'barney' : { 'name': 'barney', 'active': true },
 * // }
 */
export declare const filterObjects: (objects: {
    [key: string]: any;
}, predicate: Function) => {
    [key: string]: any;
};
export declare const filterObjectsRegExp: (objects: any, criteria: any) => {};
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