/**
 * Flattens array a single level deep.
 *
 * @param array - The array to flatten
 * @returns The new flattened array
 *
 * @example
 * ```ts
 * flatten([1, [2, [3, [4]], 5]]);
 * // => [1, 2, [3, [4]], 5]
 * ```
 */
export declare function flatten<T>(array: Array<T | T[]>): T[];
/**
 * Recursively flattens array.
 *
 * @param array - The array to flatten
 * @returns The new flattened array
 *
 * @example
 * ```ts
 * flattenDeep([1, [2, [3, [4]], 5]]);
 * // => [1, 2, 3, 4, 5]
 * ```
 */
export declare function flattenDeep<T>(array: any[]): T[];