/**
 * @module
 * Express middleware for auto-api-observe. Use `createExpressMiddleware` or
 * the default `observe()` alias for zero-config request tracing.
 */
import { RequestHandler } from 'express';
import { ObservabilityOptions } from '../types';
/**
 * Creates an Express `RequestHandler` that auto-instruments all routes with
 * request tracing, DB profiling, outbound HTTP tracking, and real-time metrics.
 *
 * @example
 * ```js
 * import express from 'express';
 * import { createExpressMiddleware } from 'auto-api-observe';
 *
 * const app = express();
 * app.use(createExpressMiddleware({ apiKey: process.env.APILENS_KEY }));
 * ```
 */
export declare function createExpressMiddleware(options?: ObservabilityOptions): RequestHandler;
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