type PlainObject = Record<string, unknown>;
type DeepMerge<T, S> = {
    [K in keyof T | keyof S]: K extends keyof S ? K extends keyof T ? T[K] extends PlainObject ? S[K] extends PlainObject ? DeepMerge<T[K], S[K]> : S[K] : S[K] : S[K] : K extends keyof T ? T[K] : never;
};
export declare function deepMerge<T extends PlainObject, S extends PlainObject>(target: T, source: S): DeepMerge<T, S>;
export {};