import React from "react";
export type FormValidator = () => string | null | Promise<string | null>;
export interface Props {
    children: React.ReactNode;
    label?: React.ReactElement | string | number | null;
    required?: boolean;
    extra?: React.ReactElement | string | number | null;
    validator?: FormValidator;
    className?: string;
    labelStyle?: React.CSSProperties;
    widthMode?: "fill" | "auto" | "shrink";
}
export declare const Item: (props: Props) => React.JSX.Element;