Apollo Client - catching offline and online events

Help
,
1

I have the following client code and wish to be able to catch server offline and online events in order to display user notifications.

import { ApolloClient, InMemoryCache } from '@apollo/client';
import { getMainDefinition } from 'apollo-utilities';
import { ApolloLink, split } from 'apollo-link';
import { WebSocketLink } from 'apollo-client-graphql-ws';
import { HttpLink } from 'apollo-link-http';

const httpServer = 'http://localhost:3030/graphql';
const wsServer = 'ws://localhost:3030/graphql';

const httpLink = new HttpLink({
    uri: httpServer,
//    credentials: 'include'
});

const wsLink = new WebSocketLink({
    url: wsServer,
    options: {
        reconnect: true,
        connectionCallback: (err, result) => {
            if (err) {
                console.log(`Error connecting to Websocket ${JSON.stringify(err)}`);
            } else {
                console.log(`Connected to WebSocket :  ${result}`);
            }
        }

    }
});

const terminatingLink = split(
    ({ query }) => {
        const { kind, operation } = getMainDefinition(query);
        return (
            kind === 'OperationDefinition' && operation === 'subscription'
        );
    },
    wsLink,
    httpLink,
);

const link = ApolloLink.from([terminatingLink]);

const cache = new InMemoryCache();

const client = new ApolloClient({
    link,
    cache
});

export default client;