type Dict<T> = Record<string, T>;
export declare function differences<T extends {
    equals: (other: T) => boolean;
}>(a: Dict<T>, b: Dict<T>): {
    added: {
        [k: string]: T;
    };
    removed: {
        [k: string]: T;
    };
    modified: {
        [k: string]: T;
    };
    unmodified: {
        [k: string]: T;
    };
    array: {
        [k: string]: T;
    }[];
};
export declare const sortKeys: <T extends Record<string, any>>(obj: T) => T;
export declare const groupBy: <T>(arr: T[], fn: (item: T) => string) => Record<string, T[]>;
export declare const isEqual: (a: unknown, b: unknown) => boolean;
export {};