import { type PropertyKey } from '../model/proxies/interceptors/abstract.interceptors';
export declare abstract class ObjectHelper {
    /**
     * Validate if the provided value is defined, not null and not undefined
     * @param {any} value the value to validate
     * @returns true if the value is defined, false otherwise
     * @public
     * @static
     */
    static isDefined(value: unknown): boolean;
    /**
     * Validate if the provided value is not defined, not null and not undefined
     * @param {any} value the value to validate
     * @returns true if the value is not defined, false otherwise
     * @public
     * @static
     */
    static isNotDefined(value: unknown): boolean;
    /**
     * Convert a class to plain object
     * @param {object} clazz the class to be converted to plain object
     * @public
     * @static
     */
    static classToPlainObject(clazz: any): any;
    static isObject(obj: any): boolean;
    /**
     * Evaluate if an obj is an instance of a type
     *
     * @param {Any} obj the object to be verified
     * @param {Any} type the type the object will be verified against
     * @returns {Boolean} true if obj is instance of type, false otherwise
     */
    static instanceOf(obj: any, type: any): boolean;
    static invoke(obj: any, key: PropertyKey, def?: any): any;
}