Accessing Redux Store outside a component

acccessRedusStore.js

// tooling modules
import axios from 'axios'

// store
import store from '../store'
store.subscribe(listener);

function select(state) {
  return state.auth.tokens.authentication_token
}

function listener() {
  let token = select(store.getState())
  axios.defaults.headers.common['Authorization'] = token;
};

// configuration
const api = axios.create({
  baseURL: 'http://localhost:3000/api/v1',
  headers: {
    'Content-Type': 'application/json',
  }
});

export default api

From this answer on StackOverflow: https://stackoverflow.com/a/38480550/3310235