/**
 * The union field renderer: a variant picker plus the active variant's fields.
 * An object variant renders its properties inline (skipping the discriminator
 * tag, which the picker owns), with the variant's required fields carrying the
 * design system's required marker; a scalar/enum variant renders as a single
 * nested {@link FieldNode}. Selecting a variant seeds a concrete value for it,
 * preserving the fields the outgoing value shares with the new variant (see
 * {@link switchVariantValue}).
 */
import type { ReactNode } from 'react';
import type { FieldModel } from './field-model';
import type { JsonSchema, SchemaFormErrors } from './types';
export declare function UnionField({ heading, description, error, model, root, value, onChange, path, errors, idPrefix, }: {
    heading: string;
    description: string | undefined;
    error: string | undefined;
    model: Extract<FieldModel, {
        kind: 'union';
    }>;
    root: JsonSchema;
    value: unknown;
    onChange: (value: unknown) => void;
    path: string;
    errors: SchemaFormErrors | undefined;
    idPrefix: string;
}): ReactNode;
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