export declare const DEFAULT_RRF_K = 60;
export declare const DEFAULT_VECTOR_K = 64;
export interface RankedList {
    /**
     * Ids ordered best → worst. Rank is the 1-based index. Ids within a single
     * list are expected to be unique; duplicates accumulate score.
     */
    readonly ids: readonly string[];
    /** Per-list weight in the fusion; default 1 (co-equal). */
    readonly weight?: number;
}
/** Raw cosine similarity in [-1, 1]. Zero-norm, length-mismatch, or non-finite result → 0 (never NaN/throw). */
export declare function cosineSimilarity(a: Float32Array, b: Float32Array): number;
/**
 * Reciprocal Rank Fusion. score(id) = Σ_lists weight / (k + rank). An id absent
 * from a list contributes 0 (RRF subsumes the union of the lists). Rank-based, so
 * it is immune to the score-scale incompatibility between IDF and cosine.
 */
export declare function fuseRRF(lists: readonly RankedList[], opts?: {
    readonly k?: number;
}): Map<string, number>;
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