export type DeepPartial<T> = {
    [P in keyof T]?: T[P] extends object ? DeepPartial<T[P]> : T[P];
};
/**
 * Performs a deep merge of two objects.
 *
 * @example
 * const target = { a: { b: 1 } };
 * const source = { a: { c: 2 } };
 * deepMerge(target, source) // { a: { b: 1, c: 2 } }
 *
 * @param target The original object.
 * @param source The updates to merge.
 * @returns A new merged object.
 */
export declare function deepMerge<T extends object, S extends object>(target: T, source: S): T & S;