export declare function mapObject<T extends object, TResult = unknown>(obj: T, iteratee: (value: T[keyof T], key: keyof T) => TResult): {
    [P in keyof T]: TResult;
};
export declare function omit(obj: undefined, keys: Array<string>): undefined;
export declare function omit(obj: null, keys: Array<string>): null;
export declare function omit<T extends object>(obj: T, keys: Array<keyof T>): Partial<T>;
export declare function isPlainObject(o: unknown): boolean;