declare namespace deepmerge {
    interface Options {
        arrayMerge?(target: any[], source: any[], options?: ArrayMergeOptions): any[];
        clone?: boolean;
        customMerge?: (key: string, options?: Options) => ((x: any, y: any) => any) | undefined;
        isMergeableObject?(value: object): boolean;
        cloneUnlessOtherwiseSpecified?(value: any, options?: Options): any;
    }
    interface ArrayMergeOptions extends Options {
        cloneUnlessOtherwiseSpecified(value: any, options?: Options): any;
    }
}
declare function deepmerge<T>(target: Partial<T>, source: Partial<T>, options?: deepmerge.Options): T;
declare function deepmerge<T1, T2>(target: Partial<T1>, source: Partial<T2>, options?: deepmerge.Options): T1 & T2;
declare namespace deepmerge {
    var all: typeof deepmergeAll;
}
declare function deepmergeAll<T extends Record<string, any> = Record<string, any>>(array: ReadonlyArray<T>, options?: deepmerge.Options): T;
export default deepmerge;