/**
 * This file is part of the NocoBase (R) project.
 * Copyright (c) 2020-2024 NocoBase Co., Ltd.
 * Authors: NocoBase Team.
 *
 * This project is dual-licensed under AGPL-3.0 and NocoBase Commercial License.
 * For more information, please refer to: https://www.nocobase.com/agreement.
 */
/// <reference types="node" />
import multer from 'multer';
import type { Readable } from 'stream';
import { AttachmentModel, StorageType } from '.';
export declare function normalizeLocalStoragePath(storagePath?: unknown): string;
export declare function getDocumentRoot(storage: any): string;
export declare function resolveSafePath(documentRoot: string, filePath?: string, filename?: string): string;
export declare function validateLocalStorageConfig(storage: Pick<StorageType['storage'], 'type' | 'options' | 'path'>, { validateDocumentRoot }?: {
    validateDocumentRoot?: boolean;
}): void;
export default class extends StorageType {
    static defaults(): {
        title: string;
        type: string;
        name: string;
        baseUrl: string;
        options: {
            documentRoot: string;
        };
        path: string;
        rules: {
            size: number;
        };
    };
    make(): multer.StorageEngine;
    exists(record: AttachmentModel): Promise<boolean>;
    copy(source: AttachmentModel, target: AttachmentModel): Promise<void>;
    delete(records: AttachmentModel[]): Promise<[number, AttachmentModel[]]>;
    getFileURL(file: AttachmentModel, preview?: boolean): Promise<any>;
    getFileStream(file: AttachmentModel): Promise<{
        stream: Readable;
        contentType?: string;
    }>;
}