import { AdditionalFieldProps } from '../additional-field.js';
/**
 * Renderer for the `username` additional field. Owns availability checking,
 * length limits, and visual indicators. `FieldError` automatically surfaces
 * native validation messages. Availability feedback is shown via the icon and
 * aria-label without affecting the field's invalid state.
 */
export declare function UsernameField({ name, field, isPending, variant }: AdditionalFieldProps): import("react").JSX.Element;