import * as sqlite3 from 'sqlite3';
import { VssLoader } from './vss-loader';
import { VectorDatabase } from './vector-database-interface';
/**
 * VSS-based vector database implementation.
 * Uses SQLite VSS Extension for optimized vector similarity search.
 * Only available on macOS and Linux (Windows not supported).
 */
export declare class VssVectorDatabase implements VectorDatabase {
    private db;
    private vssLoader;
    private vssAvailable;
    private readonly embeddingDimensions;
    constructor(db: sqlite3.Database, vssLoader: VssLoader);
    /**
     * Checks if VSS extension is available.
     */
    isAvailable(): boolean;
    /**
     * Initializes VSS Virtual Table.
     * Must be called after VSS extension is loaded.
     *
     * @returns Promise that resolves when VSS is initialized
     */
    initialize(): Promise<void>;
    /**
     * Checks if the VSS virtual table exists.
     */
    private checkVirtualTableExists;
    /**
     * Creates the VSS virtual table.
     */
    private createVirtualTable;
    /**
     * Gets the rowid for an embedding ID.
     */
    private getRowidFromEmbeddingId;
    /**
     * Gets the embedding ID from a rowid.
     */
    getEmbeddingIdFromRowid(rowid: number): Promise<string | null>;
    /**
     * Checks if a row exists in the VSS virtual table.
     */
    private checkRowExists;
    /**
     * Inserts an embedding into the VSS virtual table.
     */
    private insertEmbedding;
    /**
     * Deletes an embedding from the VSS virtual table.
     */
    private deleteEmbedding;
    /**
     * Upserts an embedding into the VSS virtual table.
     */
    upsertEmbedding(embeddingId: string, embeddingVector: Float32Array | number[]): Promise<void>;
    /**
     * Searches for similar embeddings using VSS.
     */
    search(queryEmbedding: Float32Array | number[], limit?: number, dimension?: 'X' | 'Y' | 'Z' | 'W' | 'T', pluginId?: string): Promise<Array<{
        rowid: number;
        distance: number;
        similarity?: number;
    }>>;
    /**
     * Alternative search method (fallback if MATCH syntax doesn't work).
     */
    private tryAlternativeSearch;
}
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