Example of how I do logged in user session

app.js

class App extends Component {
  componentDidMount() {
    this._loadSession().done();
  }

  componentWillReceiveProps(nextProps) {
    if (!this.props.userState.loggedIn && nextProps.userState.currentUser.sessionToken) {
      this._setSession(nextProps.userState.currentUser.sessionToken).done();
    }
  }

  async _loadSession() {
    try {
      let value = await AsyncStorage.getItem(SESSION_KEY);
      let { dispatch, userState } = this.props;

      if (value !== null) {
        dispatch(userActions.logInWithSession(value));
        console.log(value);
      }
    }

    // I don't think I care if this is successfull or errors,
    // because on initial load if it isn't there it isn't there
    // and the user has to log back in, but maybe I am crazy.
    finally {}
  }

  async _setSession(sessionValue) {
    try {
      await AsyncStorage.setItem(SESSION_KEY, sessionValue);
    } catch(error) {
      // TODO: Throw a proper error probably via the error messaging
      // if you cannot get the session.
      console.log('error setting session: ', error)
    }
  }
  render() {
    return <View></View>;
  }
};

export default App;