import type { Doc, PartialDoc, SearchResult } from '../types.js';
export declare function cosineSimilarity(a: number[], b: number[]): number;
export declare function calculateTextScore(query: string, content: string): number;
export declare function scoreDocuments(query: string, queryVector: number[], ids: string[], vectorMap: Map<string, number[]>, contentMap: Map<string, string>, topK: number): SearchResult[];
export declare function normalizeDocs(docs: Array<string | PartialDoc>): {
    normalizedDocs: Doc[];
    droppedIndices: number[];
};
export declare function generateId(): string;
export declare function heapifyUp<T extends {
    similarity: number;
}>(heap: T[], index: number): void;
export declare function heapifyDown<T extends {
    similarity: number;
}>(heap: T[], index: number): void;
export declare function reservoirSample<T>(array: T[], sampleSize: number): T[];
export interface LRUCache<K, V> {
    get(key: K): V | undefined;
    set(key: K, value: V): void;
    has(key: K): boolean;
    delete(key: K): boolean;
    clear(): void;
    readonly size: number;
}
export declare function createLRUCache<K, V>(maxSize: number): LRUCache<K, V>;