/**
 * Topic/pub-sub contract extractor for NEXUS (stub implementation).
 *
 * Detects common pub/sub patterns like:
 * - `.publish(topic)` in Kafka-style code
 * - `@KafkaListener(topic)` annotations in Java/Spring
 * - `emitter.emit(eventName)` in Node.js
 *
 * Current implementation is minimal — projects without pub/sub patterns return empty.
 * Acceptance: the extractor exists and is wire-ready; finding actual topic contracts
 * is deferred to a follow-up task if needed.
 *
 * @task T1065 — Contract Registry
 */
import type { TopicContract } from '@cleocode/contracts';
/**
 * Extract all topic/pub-sub contracts from a project's source code.
 *
 * Stub implementation: returns empty array on projects without pub/sub patterns.
 * Full implementation would search for common patterns like:
 * - `.publish(topicName)` calls
 * - `.subscribe(topicName)` calls
 * - `@KafkaListener(topic)` annotations
 * - `EventEmitter.emit(eventName)` calls
 *
 * @param projectId - Project identifier from registry
 * @param projectRoot - Root directory of the project
 * @returns Promise resolving to array of TopicContract objects (empty if no pub/sub patterns)
 */
export declare function extractTopicContracts(_projectId: string, _projectRoot: string): Promise<TopicContract[]>;
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