import { Configuration } from '../Configuration';
import Logger from './logger/Logger';
import ImageEncoder from './image-encoder/ImageEncoder';
import { DicomFileRepository } from '@utrad-ical/circus-lib/lib/dicom-file-repository';
import Counter from './Counter';
import { VolumeProvider, VolumeAccessor } from './createVolumeProvider';
import { AsyncCachedLoader } from '../../common/asyncMemoize';
/**
 * This is a simple facade interface that aggregates helper modules
 */
export interface AppHelpers {
    readonly logger: Logger;
    readonly authorizer?: Authorizer;
    readonly counter: Counter;
    readonly repository?: DicomFileRepository;
    readonly imageEncoder?: ImageEncoder;
    readonly volumeProvider?: VolumeProvider | AsyncCachedLoader<VolumeAccessor>;
}
export interface Authorizer {
    issueToken: (target: string) => Promise<string | void>;
    checkToken: (token: string, target?: string) => Promise<boolean>;
    dispose?: () => Promise<void>;
}
export default function prepareHelperModules(config: Configuration): Promise<AppHelpers>;
export declare function disposeHelperModules(modules: AppHelpers): Promise<void>;