/**
 * HNSW Vector Index FFI Bindings
 *
 * Native vector search using HNSW (Hierarchical Navigable Small World) algorithm.
 *
 * @see sochdb-index/src/ffi.rs
 */
export interface SearchResult {
    id: string;
    distance: number;
}
export interface HnswConfig {
    dimension: number;
    maxConnections?: number;
    efConstruction?: number;
    efSearch?: number;
}
export declare class HnswBindings {
    private static instance;
    private lib;
    hnsw_new: any;
    hnsw_free: any;
    hnsw_insert: any;
    hnsw_insert_batch: any;
    hnsw_insert_flat: any;
    hnsw_insert_batch_flat: any;
    hnsw_search: any;
    hnsw_search_fast: any;
    hnsw_search_ultra: any;
    hnsw_len: any;
    hnsw_dimension: any;
    hnsw_set_ef_search: any;
    hnsw_get_ef_search: any;
    hnsw_build_flat_cache: any;
    private constructor();
    static getInstance(): HnswBindings;
}
/**
 * High-level HNSW Index wrapper
 */
export declare class HnswIndex {
    private ptr;
    private bindings;
    private _dimension;
    private _efSearch;
    constructor(config: HnswConfig);
    /**
     * Insert a single vector
     */
    insert(id: string, vector: number[]): void;
    /**
     * Insert multiple vectors in batch (faster)
     */
    insertBatch(ids: string[], vectors: number[][]): void;
    /**
     * Search for k nearest neighbors
     */
    search(queryVector: number[], k: number, fast?: boolean): SearchResult[];
    /**
     * Ultra-fast search with minimal ef_search
     */
    searchUltra(queryVector: number[], k: number): SearchResult[];
    /**
     * Get number of vectors in index
     */
    get length(): number;
    /**
     * Get vector dimension
     */
    get dimension(): number;
    /**
     * Set ef_search parameter (controls search quality vs speed)
     */
    set efSearch(value: number);
    /**
     * Get ef_search parameter
     */
    get efSearch(): number;
    /**
     * Build flat cache for faster searches
     */
    buildFlatCache(): void;
    /**
     * Free native resources
     */
    close(): void;
    private stringToId;
    private idToString;
}
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