export type FeishuMessageResourceType = 'audio' | 'file' | 'image';
export interface FeishuMessageResourceRef {
    fileId: string;
    fileKey: string;
    messageId: string;
    resourceType: FeishuMessageResourceType;
}
export interface FeishuDownloadedMessageResource {
    bytes: Buffer;
    contentType?: string;
    filename?: string;
}
export declare class FeishuFileService {
    findCachedFile(input: {
        fileId: string;
    }): Promise<string | undefined>;
    writeToCache(input: {
        file: FeishuDownloadedMessageResource;
        ref: FeishuMessageResourceRef;
    }): Promise<string>;
}
export declare function cachedFeishuFilePath(input: {
    fileId: string;
    name: string;
}): string;
export declare function parseFeishuMessageResourceId(fileId: string): FeishuMessageResourceRef | undefined;
export declare function feishuMessageResourceId(input: {
    fileKey: string;
    messageId: string;
    resourceType: FeishuMessageResourceType;
}): string;
export declare const defaultFeishuFileService: FeishuFileService;
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