import * as Bunyan from 'bunyan';
import { Request as ExpressRequest } from 'express';
import { IdentifiedBillBase } from '../types';
import { StringTo } from '../helper-types';
export declare type PrincipalFnRet<TIdentifiedBill extends IdentifiedBillBase> = TIdentifiedBill | null | false;
export declare type PrincipalFn<TIdentifiedBill extends IdentifiedBillBase> = (headers: StringTo<string | Array<string> | undefined>, cookies: StringTo<string>, request: ExpressRequest) => PrincipalFnRet<TIdentifiedBill> | Promise<PrincipalFnRet<TIdentifiedBill>>;
export interface HttpAuthnOptions<TIdentifiedBill extends IdentifiedBillBase> {
    principalFn: PrincipalFn<TIdentifiedBill>;
    anonymousScopes: ReadonlyArray<string>;
    logger?: Bunyan;
}