/**
 * Flattens `array` a single level deep.
 *
 * @param {Array} arr The array to flatten.
 * @param {Array} result The array to return.
 * @return {Array} Returns the new flattened array.
 * @example
 *
 * flattenDeep([1, [2, [3, [4]], 5]]);  // => [1, 2, 3, 4, 5]
 */
declare const flattenDeep: (arr: any[], result?: any[]) => any[];
export default flattenDeep;