import * as express from 'express';
/**
 * Correlation ID Middleware
 *
 * @param filter a filter which is going to be called with the request to see if a
 * colleration id scope must be managed or not.
 */
export declare const createCorrelationIdMiddleware: (filter?: (req: express.Request) => boolean) => ((req: express.Request, res: express.Response, next: express.NextFunction) => void);
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