import { ApolloLink, Observable, Operation, FetchResult } from "@apollo/client/core";
import { BusLinkRequestTypes, DefaultInitArgs, BusLinkResponseTypes } from "../types";
declare type LinkArgs<A = DefaultInitArgs> = {
    requestHandler: (message: BusLinkRequestTypes<A>) => void;
    registerResponseHandler: (responseHandler: (response: BusLinkResponseTypes) => void) => void;
};
export default class MessengeBusLink<A = DefaultInitArgs> extends ApolloLink {
    private counter;
    private observers;
    private postMessage;
    private readyListener?;
    onResponse: (message: BusLinkResponseTypes) => void;
    constructor({ registerResponseHandler, requestHandler }: LinkArgs<A>);
    request(operation: Operation): Observable<FetchResult>;
    /**
     * Initialise the backend with the provided args.
     * Will resolve once the backend has been created,
     * and has responded with ready.
     *
     * This doesn't need to be called if you preinitialise
     * the backend (in electron main for example)
     */
    initialiseBackend(args: A): Promise<void>;
}
export {};