import * as React from 'react';
export interface OptionalFieldsProps {
    title?: React.ReactNode;
    description?: React.ReactNode;
    defaultOpen?: boolean;
    icon?: React.ReactNode | null;
    className?: string;
    contentClassName?: string;
    children: React.ReactNode;
}
/**
 * Canonical progressive-disclosure container for *optional* / *advanced* fields.
 * Children stay mounted at all times (only display collapses) — form state preserved.
 */
export declare function OptionalFields({ title, description, defaultOpen, icon, className, contentClassName, children, }: OptionalFieldsProps): import("react/jsx-runtime").JSX.Element;
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