/**
 * Deeply merges the properties of the source object into the target object.
 * If both target and source are objects, it recursively merges their properties.
 * If both target and source are arrays, it concatenates the source array into the target array.
 *
 * @param target - The target object or array to merge properties into.
 * @param source - The source object or array to merge properties from.
 * @returns The modified target object or array.
 */
export declare function deepMerge(target: any, source: any): any;
export type RecursivePartial<T> = {
    [P in keyof T]?: T[P] extends object ? RecursivePartial<T[P]> : T[P];
};