import { FieldError, FieldErrorsImpl, Merge } from "react-hook-form";
export type FormErrorMessage = string | false | FieldError | Merge<FieldError, FieldErrorsImpl<any>> | undefined;
/**
 * react-hook-form's error.message isn't always a plain string — it can be a
 * FieldError (or a Merge of nested FieldErrors for field arrays/objects),
 * which would crash React ("Objects are not valid as a React child") if
 * rendered directly. Pulls out a safely-renderable string, or undefined.
 */
export declare function getErrorMessage(message: FormErrorMessage): string | undefined;