apollo-link-state

withClientState: (clientStateConfig?: ClientStateConfig) => {
    writeDefaults(): void;
    request(
        operation: Operation,
        forward?: NextLink
    ): Observable<FetchResult<Record<string, any>, Record<string, any>>>;
    split(test: (op: Operation) => boolean, left: any, right?: any): ApolloLink;
    concat(next: any): ApolloLink;
};

type ClientStateConfig = {
    cache?: ApolloCache<any>;
    resolvers: any | (() => any);
    defaults?: any;
    typeDefs?: string | string[] | DocumentNode | DocumentNode[];
    fragmentMatcher?: FragmentMatcher;
};