export declare const omitData: (data: any) => Omit; export declare const wrap: (items?: T | T[]) => T[]; export declare const isString: (value: any) => value is string; export declare function pick(obj: T, keys: K[]): Pick; export declare function omit(obj: T, keys: K[]): Omit; export declare const omitNil: >(obj: T) => T;