import { FileStorageOption, FileStorageProviderEnum } from '@metad/contracts';
import * as Providers from './providers';
import { Provider } from './providers/provider';
export declare class FileStorage {
    providers: {
        [key: string]: Provider<any>;
    };
    config: FileStorageOption;
    constructor(option?: FileStorageOption);
    setConfig(config?: Partial<FileStorageOption>): this;
    setProvider(providerName: FileStorageProviderEnum): this;
    getProvider(providerName?: FileStorageProviderEnum): Providers.Provider<any>;
    storage(option?: FileStorageOption): import("multer").StorageEngine;
    getProviderInstance(): Provider<any>;
    initProvider(): void;
}