import type { RdfSearchCardinalityEstimate, RdfTextChunkInput, RdfTextIndexLike, RdfTextIndexStats, RdfTextRebuildStatus, RdfTextRebuildStatusInput, RdfTextSearchOptions, RdfTextSearchResult, RdfTextSourceListOptions, RdfTextSourceMetadata, RdfTextSourceInput, RdfTextTermDocumentFrequency } from './types';
export type PostgresRdfTextSearchBackend = 'posting' | 'pg-native-fts' | 'auto';
export interface PostgresRdfTextIndexOptions {
    driver?: 'pglite' | 'pg';
    dataDir?: string;
    connectionString?: string;
    host?: string;
    port?: number;
    database?: string;
    user?: string;
    password?: string;
    pool?: any;
    autoOpen?: boolean;
    maxSourceBytes?: number;
    maxChunksPerSource?: number;
    textSearchBackend?: PostgresRdfTextSearchBackend;
}
export declare class PostgresRdfTextIndex implements RdfTextIndexLike {
    private readonly options;
    private executor;
    private pglite;
    private pgPool;
    private sharedPoolConfig;
    private initializing;
    constructor(options?: PostgresRdfTextIndexOptions);
    open(): Promise<void>;
    close(): Promise<void>;
    clear(): Promise<void>;
    schemaVersion(): Promise<number>;
    private readSchemaVersion;
    sourceMetadata(source: string): Promise<RdfTextSourceMetadata | undefined>;
    listSources(options?: RdfTextSourceListOptions): Promise<RdfTextSourceMetadata[]>;
    recordRebuildStatus(input: RdfTextRebuildStatusInput): Promise<void>;
    rebuildStatus(source: string): Promise<RdfTextRebuildStatus | undefined>;
    indexText(source: RdfTextSourceInput, text: string, chunks?: RdfTextChunkInput[]): Promise<void>;
    moveSource(oldSource: string, next: RdfTextSourceInput): Promise<number>;
    deleteSource(source: string): Promise<number>;
    search(options: RdfTextSearchOptions): Promise<RdfTextSearchResult[]>;
    listSourceChunks(sourceKey: string): Promise<RdfTextSearchResult[]>;
    estimateSearchCardinality(options: RdfTextSearchOptions): Promise<RdfSearchCardinalityEstimate>;
    private searchNativeFts;
    private estimateNativeFtsSearchCardinality;
    stats(): Promise<RdfTextIndexStats>;
    termDocumentFrequency(limit?: number): Promise<RdfTextTermDocumentFrequency[]>;
    private openInternal;
    private initializeSchema;
    private initializeNativeFtsSchema;
    private validateSchema;
    private validateNativeFtsSchema;
    private nativeFtsEnabled;
    private canUseNativeFts;
    private upsertSource;
    private estimateDatabaseBytes;
    private entitiesForChunk;
    private entitiesForChunks;
    private requireExecutor;
}