import { Middleware } from '@jsonforms/core';
/**
 * A JsonForms middleware that drops the ajv `type` error a file field raises while it holds a picked file.
 *
 * A file column's schema is `type: 'string'` plus `contentMediaType`, while the form data holds the `File`
 * itself until submit turns it into multipart, so ajv reports "must be string" for it on every validation
 * pass. Only errors whose parent schema marks a file and whose value is a real `Blob` are dropped, so a
 * genuinely wrong value (a number, a plain object) still fails.
 *
 * @param state - The current core state.
 * @param action - The dispatched core action.
 * @param defaultReducer - The reducer this middleware wraps.
 * @returns The reduced state, without the file type errors.
 */
export declare const fileErrorMiddleware: Middleware;