import { OperationVariables } from '@apollo/client';
import { DocumentNode } from 'graphql';
import { CreateClientOpts } from '../apollo';
import { ChannelHeaders } from './persistedQueries/PersistedClient';
export type ErrorCallback = (err: Error) => void;
export interface IntervalQueryOptions {
    query: DocumentNode;
    pollInterval: number;
    createClientOpts: CreateClientOpts;
    variables?: OperationVariables;
    onError?: ErrorCallback;
}
export declare class IntervalQuery<ResponseShape> {
    private pendingResponse?;
    private lastResponse?;
    private query;
    private client?;
    private createClientOpts;
    private variables?;
    private timeout;
    private onError?;
    private pollInterval;
    private channelHeaders?;
    constructor({ query, variables, createClientOpts, pollInterval, onError, headers }: IntervalQueryOptions & {
        headers?: ChannelHeaders;
    });
    private scheduleNext;
    private executeQuery;
    results(): Promise<ResponseShape>;
    getPendingResponse(): Promise<ResponseShape | undefined>;
    extractCache(): any;
}