import { Nullable } from "../../base-types";
import { IIterator } from "./iterator";
import { Query } from "./query";
import { IQueryResult } from "./query-result";
export interface IQueryIterator<T extends IQueryResult> extends IIterator<T> {
    readonly current: Nullable<T>;
}
export declare abstract class QueryIteratorBase<T extends IQueryResult> implements IQueryIterator<T> {
    private readonly _query;
    current: Nullable<T>;
    constructor(query: Query, result?: T);
    canMoveNext(): boolean;
    canMovePrevious(): boolean;
    moveNextAsync(): Promise<boolean>;
    movePreviousAsync(): Promise<boolean>;
    reset(): void;
    abstract getResultAsync(query: Query): Promise<T>;
}