import { Storage } from '@google-cloud/storage';
import { ComKey, Item, PriKey } from '@fjell/types';
import { PathBuilder } from '../../PathBuilder';
import { Options } from '../../Options';
/**
 * Download a file attachment for an item
 */
export declare function downloadFile<V extends Item<S, L1, L2, L3, L4, L5>, S extends string, L1 extends string = never, L2 extends string = never, L3 extends string = never, L4 extends string = never, L5 extends string = never>(storage: Storage, bucketName: string, key: PriKey<S> | ComKey<S, L1, L2, L3, L4, L5>, label: string, filename: string, pathBuilder: PathBuilder, options: Options<V, S, L1, L2, L3, L4, L5>): Promise<Buffer>;