import { Doc } from "./docs.js";
interface SearchResult {
    doc: Doc;
    score: number;
    snippet: string;
}
/** Simple TF-IDF search engine — no external dependencies */
export declare class SearchEngine {
    private idfCache;
    private docTermFreqs;
    private totalDocs;
    private static STOP_WORDS;
    /** Lightweight synonym map for common gamedev query expansions */
    private static QUERY_SYNONYMS;
    /** Lightweight stemmer — strips common English suffixes for better recall */
    private stem;
    /** Tokenize text into lowercase terms, splitting hyphens and handling special tokens */
    private tokenize;
    /** Build the index from a list of docs */
    index(docs: Doc[]): void;
    /** Expand query tokens with synonyms (discounted weight) */
    private expandWithSynonyms;
    /** Search docs, return sorted by relevance. Callers pass filtered doc
     *  subsets, so results are computed fresh each call — a sub-millisecond
     *  scan; a query-keyed cache here once leaked results across filters. */
    search(query: string, docs: Doc[], limit?: number): SearchResult[];
    /** Extract a relevant snippet containing query terms */
    private extractSnippet;
}
export {};