/**
 * 本地文件系统 PersistenceProvider 实现
 *
 * 将文件写入本地磁盘目录，提供 HTTP URL 供前端访问。
 * 这是默认的 Provider，行为与原有 artifact.service.ts 一致。
 */
import type { PersistenceProvider, FileMeta, DataMeta, PersistedFile, PersistedData, LocalFsProviderConfig } from '../../spi/persistence-interfaces.js';
export declare class LocalFsProvider implements PersistenceProvider {
    readonly name = "local";
    private rootDir;
    private urlPrefix;
    constructor(config: LocalFsProviderConfig);
    saveFile(key: string, content: Buffer | NodeJS.ReadableStream, meta?: FileMeta): Promise<PersistedFile>;
    saveData(key: string, data: unknown, meta?: DataMeta): Promise<PersistedData>;
    readFile(key: string): Promise<Buffer>;
    readData<T = unknown>(key: string): Promise<T>;
    delete(key: string): Promise<void>;
    exists(key: string): Promise<boolean>;
    getAccessibleUrl(key: string, _expirySec?: number): Promise<string>;
    /** 获取文件绝对路径（供 controller 读取） */
    resolveFilePath(key: string): string;
    /** 安全化 key：防止路径穿越 */
    private normalizeKey;
}
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