import type { Server } from 'node:http';
/**
 * Given a server and a starting port, keep listening on every port in
 * sequence until the first available one is found, and return it.
 *
 * If an available port cannot be found, then the last error will be raised.
 */
export declare const listenCarefully: (server: Server, start: number, end?: number) => Promise<number>;
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