/**
 * Heuristic Matching for Google Search Results
 *
 * Stage 4 of the entity resolution pipeline.
 * Rule-based matching to resolve obvious matches without AI.
 */
import type { DeferredItem, EntityType, GoogleSearchResult, HeuristicMatch } from './types';
/**
 * Normalize unicode by removing diacritics/accents.
 */
export declare function normalizeUnicode(s: string): string;
/**
 * Extract content words from a title, removing filler words and punctuation.
 */
export declare function extractContentWords(title: string): Set<string>;
/**
 * Get source name from URL.
 */
export declare function getSource(url: string): string | null;
/**
 * Get canonical (root) URL for a source.
 */
export declare function getCanonicalUrl(url: string, source: string): string;
/**
 * Result from heuristic matching.
 */
interface HeuristicMatchResult {
    /** Matched items */
    found: HeuristicMatch[];
    /** Items deferred to AI classification */
    deferred: DeferredItem[];
}
/**
 * Try to find a heuristic match for search results.
 *
 * Returns match if found, null if should defer to AI.
 */
export declare function tryHeuristicMatch(title: string, category: EntityType, results: GoogleSearchResult[]): HeuristicMatch | null;
/**
 * Apply heuristic matching to multiple search results.
 *
 * @param items - Array of items with search results
 * @returns Found matches and deferred items
 */
export declare function applyHeuristics(items: Array<{
    title: string;
    category: EntityType;
    results: GoogleSearchResult[];
    author?: string;
}>): HeuristicMatchResult;
export {};
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