/**
 * Nexus Discovery — Cross-project task discovery and search business logic.
 *
 * Extracted from src/dispatch/engines/nexus-engine.ts so the engine
 * remains a thin wrapper and all business logic lives in src/core/.
 *
 * @task T5701
 * @epic T5701
 */
import type { NexusDiscoverParams, NexusDiscoverResult, NexusSearchParams, NexusSearchResult } from '@cleocode/contracts/operations/nexus';
import { type EngineResult } from '../engine-result.js';
/**
 * Extract meaningful keywords from text (filters stop words and short tokens).
 */
export declare function extractKeywords(text: string): string[];
/**
 * Discover tasks related to a given task query across projects.
 *
 * Returns a structured result or throws on unrecoverable errors.
 * Validation errors (bad syntax, wildcard) are returned as { error } objects
 * so callers can wrap them in an appropriate engine error response.
 */
export declare function discoverRelated(_projectRoot: string, params: NexusDiscoverParams): Promise<NexusDiscoverResult | {
    error: {
        code: string;
        message: string;
    };
}>;
/** @deprecated Use `discoverRelated(projectRoot, params)` — ADR-057 D1 */
export declare function discoverRelated(taskQuery: string, method?: string, limit?: number): Promise<NexusDiscoverResult | {
    error: {
        code: string;
        message: string;
    };
}>;
/**
 * Search for tasks across all registered projects.
 *
 * Returns a structured result or throws on unrecoverable errors.
 * Validation errors (bad pattern) are returned as { error } objects.
 */
export declare function searchAcrossProjects(_projectRoot: string, params: NexusSearchParams): Promise<NexusSearchResult | {
    error: {
        code: string;
        message: string;
    };
}>;
/** @deprecated Use `searchAcrossProjects(projectRoot, params)` — ADR-057 D1 */
export declare function searchAcrossProjects(pattern: string, projectFilter?: string, limit?: number): Promise<NexusSearchResult | {
    error: {
        code: string;
        message: string;
    };
}>;
export declare function nexusDiscover(taskQuery: string, method?: string, limit?: number): Promise<EngineResult<{
    query: string;
    method: string;
    results: Array<{
        project: string;
        taskId: string;
        title: string;
        score: number;
        type: string;
        reason: string;
    }>;
    total: number;
}>>;
export declare function nexusSearch(pattern: string, projectFilter?: string, limit?: number): Promise<EngineResult<{
    pattern: string;
    results: Array<{
        id: string;
        title: string;
        status: string;
        priority?: string;
        description?: string;
        _project: string;
    }>;
    resultCount: number;
}>>;
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