export declare function getPortLazy(): Promise<number | undefined>;
/**
 * Resets the per-process port cache. Intended for tests; not used on the hot
 * path. Callers must let any in-flight lookup settle (await the pending
 * `getPortLazy()` call) before resetting: clearing `_inFlight` here does not
 * cancel an already-scheduled resolution, so a late `.then` could otherwise
 * repopulate `_cachedPort` after the reset and bleed into the next test.
 */
export declare function resetPortCacheForTesting(): void;
/**
 * Installs a fake port resolver and clears the cache. Test-only seam used to
 * exercise the caching contract deterministically without touching the OS.
 */
export declare function setPortResolverForTesting(fn: () => Promise<number | undefined>): void;
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