/**
 * Simple object check.
 * @param item Determine if object for item.
 * @returns True if the item is an object.
 */
export declare function isObject(item: unknown): boolean;
/**
 * Deep merge two objects.
 * @param target The target object.
 * @param source The source object.
 * @returns The merged object.
 */
export declare function mergeDeep<T extends {
    [key: string]: unknown;
}>(target: T, source: T): T;