/**
 * It validate if a variable (object) not contains an attribute, it can be in differents "levels"
 * @param {object | any} variable variable to evaluate
 * @param {(string | number) | (string | number)[] | any} into Can be a name (string) of attribute , or an array of attribute s (string[]) if the attribute  is an object
 * @returns {string} Return true if the attribute  is null, otherwise false
 */
declare const safeIsNull: (variable: object | any, into: (string | number) | (string | number)[] | any) => boolean;
export { safeIsNull };