How to keep state unchanged after page refresh?

Question

Hi everyone, I'm trying to find a way to persist my status values ​​across page refreshes. Currently I'm storing the values ​​in local storage and I've tried many solutions to keep the user logged in after the page reloads still doesn't work. I get this quit every time when I refresh the page, any help would be greatly appreciated. Thank you so much.

Core.ts：

class Core {
      agv: typeof agv;
      auth: Auth;
      workflow: WorkflowApi;
      graphql: GraphQLSdk;
      fleetState: Stream<FleetState>;
      taskList: Stream<TaskList>;
      zoneList: Stream<ZoneList>;

  configuration = getConfiguration();

  url: string;

  constructor(options: Options) {
    const auth = getAuth(options);
    const graphqlUrl = `${options.host}/graphql`;
    const graphql = getSdk(new GraphQLClient(graphqlUrl, { fetch: authMiddleware({ auth, fetch: options.fetch }) }));

    const streamContext = {
      ...options,
      headers: getAuthHeaders(auth),
      getSites: () => auth.session.value?.sites || [],
    };

    this.auth = auth;
    this.workflow = getWorkflowApi({ auth }) ;
    this.graphql = graphql;
    this.fleetState = fleetState.call({
      ...options,
      headers: getAuthHeaders(auth),
      getSites: () => auth.session.value?.sites || [],
    });

    this.configuration.map.fetch = this.configuration.map.fetch.bind(async () => {
      const site = auth.session.value.sites[0];
      return graphql.map({ site }).then(({ map }) => map);
    });

    this.taskList = taskList.call(streamContext);
    this.zoneList = zoneList.call(streamContext);

    this.agv = {
      ...agv,
      graphql,
      map: this.configuration.map,
      getSites: () => auth.session.value?.sites || [],
    } as typeof agv;

    auth.session.listen(session => {
      window.localStorage.setItem('session', JSON.stringify(session));
      console.log(session);
      if (session) {
    this.configuration.map.fetch();
      }
    });
  }
}

export { Core };

Answer 1

If the session is persisted to localStorage, as follows

auth.session.listen(session => {
  window.localStorage.setItem('session', JSON.stringify(session));
  ...
})

Then I think you can initialize from localStorage in getAuth as follows

function getAuth({ host, fetch }: Dependencies) {
  const session = getEventEmitter({
    initialValue: JSON.parse(window.localStorage.getItem("session")),
  });

  ...

If no session remains in the state, null is the value of the expression and is returned as initialValue.