/**
 * Workspace 内 Session 附件的本地实现。
 *
 * Data URL 在这里解码为文件；Message 层只接收相对 Workspace 根目录的文件引用。
 */
import type { FileSystem } from "../../types/workspace/FileSystem.js";
import type { SessionAttachmentStore } from "../../types/store/SessionAttachmentStore.js";
export interface LocalSessionAttachmentStoreOptions {
    /** Workspace 文件能力。 */
    files: FileSystem;
    /** 当前 Session 附件目录的绝对路径。 */
    attachments_dir_path: string;
}
/** Session 附件本地持久化实现。 */
export declare class LocalSessionAttachmentStore implements SessionAttachmentStore {
    private readonly files;
    private readonly attachments_dir_path;
    constructor(options: LocalSessionAttachmentStoreOptions);
    persist_data_url(input: {
        data_url: string;
        media_type: string;
        filename?: string;
    }): Promise<string>;
}
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