/// <reference types="zen-observable" />
import { Observable } from '@apollo/client';
export declare type Operation = {
    variables: Record<string, any>;
    operationName: string;
    extensions: Record<string, any>;
    setContext: (context: Record<string, any>) => Record<string, any>;
    getContext: () => Record<string, any>;
    toKey: () => string;
};
export declare type FetchResult<TData = {
    [key: string]: any;
}, C = Record<string, any>, E = Record<string, any>> = TData & {
    extensions?: E;
    context?: C;
};
export declare type NextLink = (operation: Operation) => Observable<FetchResult>;
export declare function initializeApollo(initialState?: null): any;
export declare function useApollo(initialState: any): any;