import { TogglingApi, TogglingApiByActivationContext } from '../client';
import { Response, Request, NextFunction } from 'express-serve-static-core';
import { Extractor, ForcedToggleExtractor } from './extractors';
export declare type ExpressConfig = {
    client: TogglingApiByActivationContext;
    /**
     * Customize request extractors
     */
    extractors?: {
        /**
         * Visitor UUID extractor
         */
        uuid?: Extractor<string>;
        /**
         * Forced-toggles extractor
         */
        forcedToggles?: ForcedToggleExtractor;
        /**
         * Extractors for different toggle attributes
         * The value extracted from the request will be used to compared against the toggle attribute to determine activation
         */
        attributes?: Array<{
            attribute: string;
            extractor: Extractor<string>;
        }>;
    };
};
/**
 * An Express-middleware that provides toggle computation based on the Request information
 */
export declare const middleware: (config: ExpressConfig) => (req: Request, _: Response, next: NextFunction) => void;
/**
 * A refinement of the base toguru client that extracts activation information from the request
 */
export declare const expressClient: (config: ExpressConfig) => (req: Request) => TogglingApi;