import { ApolloLink, NextLink, Operation, Observable } from "apollo-link";
import { NetworkStatus, OfflineQueueListener, OfflineMutationsHandler, OfflineStore } from ".";
import { ObjectState } from "../conflicts";
import * as debug from "debug";
export declare const logger: debug.Debugger;
export interface OfflineLinkOptions {
    networkStatus: NetworkStatus;
    store: OfflineStore;
    listener?: OfflineQueueListener;
    conflictStateProvider?: ObjectState;
}
/**
 * Apollo link implementation used to queue graphql requests.
 *
 * Link will push every incoming operation to queue.
 * All operations that are ready (i.e. they don't use client
 * generated ID) are forwarded to next link when:
 *
 * - client goes online
 * - there is a new operation and client is online
 * - operation was completed (which could result in ID updates, i.e. new
 *   operations ready to be forwarded - see OfflineQueue class)
 */
export declare class OfflineLink extends ApolloLink {
    private online;
    private queue;
    private readonly networkStatus;
    private offlineMutationHandler?;
    constructor(options: OfflineLinkOptions);
    request(operation: Operation, forward: NextLink): Observable<{}>;
    /**
     * Force forward offline operations
     */
    forwardOfflineOperations(): Promise<void>;
    initOnlineState(): Promise<void>;
    setup(handler: OfflineMutationsHandler): void;
}