talk/plugin-api/beta/client/selectors/auth.js

import get from 'lodash/get';

export const usernameStatusSelector = state =>
  get(state, 'auth.user.status.username.status');

export const usernameSelector = state => get(state, 'auth.user.username');

export const isLoggedInSelector = state => !!get(state, 'auth.user');