/**
 * This file is part of the @egodigital/nef distribution.
 * Copyright (c) e.GO Digital GmbH, Aachen, Germany (https://www.e-go-digital.com/)
 *
 * @egodigital/nef is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, version 3.
 *
 * @egodigital/nef is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * Keeps sure to return a value as array.
 *
 * @param {T|T[]} val The input value.
 *
 * @return {T[]} The output value.
 */
export declare function asArray<T>(val: T | T[]): T[];
/**
 * Returns classes of an object deep.
 *
 * @param {any} obj The object.
 *
 * @return {any[]} The list of classes.
 */
export declare function getClassesFromObject(obj: any): any[];
/**
 * Loads a module.
 *
 * @param {string} file The path to the module.
 * @param {boolean} [useCache] Use cache or not.
 *
 * @return {TModule} The module.
 */
export declare function loadModule<TModule = any>(file: string, useCache?: boolean): TModule;
/**
 * Converts a value to a boolean, if needed.
 *
 * @param {any} val The input value.
 * @param {boolean} [defaultValue] The custom default value.
 *
 * @return {string} The output value.
 */
export declare function toBooleanSafe(val: any, defaultValue?: boolean): boolean;
/**
 * Converts a value to a string, if needed, that is not (null) and (undefined).
 *
 * @param {any} val The input value.
 *
 * @return {string} The output value.
 */
export declare function toStringSafe(val: any): string;