/**
 * Composer line for a chat whose model was retired or removed from the
 * catalog. Earlier turns keep their model; only the next message changes, and
 * the line says which model it will use instead of switching silently.
 */
export declare function UnavailableModelNotice({ modelName, replacementLabel, }: {
    /** Readable name of the session's unavailable model. */
    modelName: string;
    /** The model the composer now has selected, or null when none is selected. */
    replacementLabel: string | null;
}): import("react").JSX.Element;