/**
 * Deterministic reranker over the fused top-50
 * (docs/hybrid-retrieval-design.md, step 7 of the shipping order).
 *
 * The eval gate showed fused Recall@50 well above Recall@5/10 — the right
 * candidates survive fusion but sit too deep. This reranker re-orders them
 * using evidence that is only cheap to compute *after* fusion, when there
 * are ≤50 candidates instead of thousands of lines:
 *
 *   - term coverage: how many distinct query terms appear in the candidate's
 *     actual expanded window (read from disk);
 *   - path affinity: query terms appearing in the candidate's file path —
 *     this is what lets a query like `core/search/hybrid-search.ts` rank the
 *     file itself first, which content grep alone cannot do;
 *   - fused prior: the RRF ordering, so retriever consensus still counts.
 *
 * Not every signal suits every query. A query that names something and a query
 * that describes behaviour want different evidence, so the name-matching
 * signal is gated on {@link queryIsProse} — see its comment for the numbers.
 *
 * Purely lexical-statistical and deterministic — no model, no I/O beyond
 * reading candidate windows. A cross-encoder can later replace the scoring
 * function behind the same signature; that model work belongs to
 * `kolisachint/embeddingsearchtools`, not here.
 */
import type { FusedCandidate } from "./types.js";
/**
 * Is `query` a sentence rather than a name?
 *
 * A quoted segment is never prose regardless of its words: the plan collapses
 * it to one literal term, so the declaration bonus cannot fire on it anyway,
 * and its path-token split is what lets `"Theme not initialized…"` find
 * `core/theme.ts`.
 */
export declare function queryIsProse(query: string): boolean;
export interface RerankResult {
    candidates: FusedCandidate[];
    latencyMs: number;
}
/**
 * The exact source text each candidate stands for, as the model should see it.
 *
 * Shared with the cross-encoder path so both rerankers score identical text —
 * otherwise a comparison between them would partly measure which one got a
 * better view of the candidate.
 */
export declare function readCandidateWindows(candidates: readonly FusedCandidate[], cwd: string): Array<string | undefined>;
export declare function rerankCandidates(query: string, candidates: readonly FusedCandidate[], cwd: string): RerankResult;
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