import { Request, Response, NextFunction } from 'express';
export interface AnyErrorDuck extends Error {
    code?: string;
    status?: number;
    [key: string]: any;
}
export declare type ServeFunction = (req: Request, res: Response) => void;
export declare type MiddlewareFunction = (req: Request, res: Response, next: NextFunction) => void;
export declare type TransformPromiseFromFileName = ((fileName: string) => Promise<any>);
export declare let globalOpts: {
    serveErr: {
        propertiesWhiteList: string[];
        sendStack: boolean;
    };
    logServe: boolean;
    readConfig: {
        exts: {
            [key: string]: (fileName: string) => Promise<any>;
        };
    };
};
export declare function serveErr(req: Request, res: Response, next: NextFunction): (err: AnyErrorDuck) => Promise<void>;
export declare type IdentsMap = {
    [key: string]: boolean;
};
export declare function preEval(expresion: string, vars: IdentsMap, functions: IdentsMap): boolean;
export declare function serveText(htmlText: string, contentTypeText: string): ServeFunction;
export declare function serveFile(fileName: string, options: object): ServeFunction;
export declare function escapeRegExp(string: string): string;
export declare function getTraceroute(): string;
export declare function serveStylus(pathToFile: string, anyFile: boolean): MiddlewareFunction;
export declare function serveJade(pathToFile: string, anyFileOrOptions: boolean): MiddlewareFunction;
export declare function serveJson(object: any): MiddlewareFunction;
export declare function serveYaml(object: any): MiddlewareFunction;
export declare function readConfig(listOfFileNamesOrConfigObjects: (string | object)[], opts?: {
    whenNotExist?: string;
}): Promise<object>;