/**
 * Shared TF-IDF helpers for tool and skill relevance scoring.
 */
import { tokenize } from './tool-filter.js';
export { tokenize };
export declare function buildDocumentFrequency(corpusTermSets: Iterable<Set<string>>): Map<string, number>;
export declare function createIdfFn(docCount: number, df: Map<string, number>): (term: string) => number;
/** Weighted term overlap: sum(baseWeight * idf) for query tokens present in doc. */
export declare function scoreWeightedTfidfOverlap(query: string, docWeightedTerms: Map<string, number>, idf: (term: string) => number): number;
export declare function collectSkillWeightedTerms(skill: {
    name: string;
    description: string;
    keywords?: string[];
    tags?: string[];
}): Map<string, number>;
export declare function collectTermSet(weighted: Map<string, number>): Set<string>;
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