import { AsyncPreparedStatement, ScriptTokens, TokenType } from './@duckdb/duckdb-wasm';
import { MDConnectionParams } from './MDConnectionParams.js';
import { MaterializedQueryResult, SafePrepareResult, SafeQueryResult, StreamingQueryResult } from './QueryTypes.js';
export { AsyncPreparedStatement, ScriptTokens, TokenType };
export declare class MDConnection {
    readonly params: MDConnectionParams;
    private deferredDdbConnection;
    private sequencer;
    private constructor();
    static create(params: MDConnectionParams): MDConnection;
    isInitialized(): Promise<boolean>;
    tokenize(text: string): Promise<ScriptTokens>;
    incompleteQueryCount(): number;
    enqueueQuery(query: string, args?: unknown[]): string;
    safePrepareQuery(query: string): Promise<SafePrepareResult>;
    safeEvaluateQuery(query: string): Promise<SafeQueryResult<MaterializedQueryResult>>;
    safeEvaluatePreparedStatement(query: string, ...args: unknown[]): Promise<SafeQueryResult<MaterializedQueryResult>>;
    safeEvaluateStreamingQuery(query: string): Promise<SafeQueryResult<StreamingQueryResult>>;
    safeEvaluateStreamingPreparedStatement(query: string, args: unknown[]): Promise<SafeQueryResult<StreamingQueryResult>>;
    safeEvaluateQueuedQuery(queryId: string): Promise<SafeQueryResult<MaterializedQueryResult>>;
    prepareQuery(query: string): Promise<AsyncPreparedStatement>;
    evaluateQuery(query: string): Promise<MaterializedQueryResult>;
    evaluatePreparedStatement(query: string, args: unknown[]): Promise<MaterializedQueryResult>;
    evaluateStreamingQuery(query: string): Promise<StreamingQueryResult>;
    evaluateStreamingPreparedStatement(query: string, args: unknown[]): Promise<StreamingQueryResult>;
    private evaluateExclusive;
    evaluateQueuedQuery(queryId: string): Promise<MaterializedQueryResult>;
    cancelQuery(queryId: string, errorMessage?: string): Promise<boolean>;
    close(): Promise<void>;
}