/**
 * Shared per-key mutex serializing external-scanner ingest dispatch.
 *
 * Keyed by the engine's per-(scanner,strategy) guard identity (runtimeId +
 * configured scanner NAME) so batched or concurrent signals for one scanner
 * ingest one at a time — the engine allows only one in-flight ingest per key
 * and rejects overlap. Different keys still run concurrently.
 *
 * Process/plugin scope (single shared instance) so it serializes across both
 * dispatch seams and across separate POSTs, not just within one request.
 */
import { KeyedMutex } from "../../utils/keyed-mutex.js";
export declare const ingestDispatchMutex: KeyedMutex;
/** The engine guard identity: runtimeId + configured scanner NAME. */
export declare function ingestDispatchKey(runtimeId: string, scannerName: string): string;
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