What is the best way to request a refresh_token in Vue?

Question

JavaScript

Hey!
It is necessary to check the validity of the access_token before each ajax request, and if it is expired before the ajax request, make a request to reissue it by refresh_token.
I do it like this:

Vue.http.interceptors.push((request, next) => {
  var accessToken = null
  if (window.location.pathname !== '/login') {
    if (window.localStorage && typeof window.localStorage.user !== 'undefined' && typeof window.localStorage.user_auth !== 'undefined') {
      var _user = JSON.parse(window.localStorage.user)
      var userAuth = JSON.parse(window.localStorage.user_auth)
      var interval = parseInt(new Date().getTime() / 1000) - userAuth.timestamp
      // ставим - 10 секунд, перестраховываемся на счет задержки при выдачи токена
      if (interval > userAuth.expires_in - 10) {
        if (request.url !== 'https://api.domain.ru/v1/oauth/refresh') {
          accessToken = user.refreshToken(_user.id, userAuth.refresh_token)
          request.headers.set('Authorization', 'Bearer ' + accessToken)
        }
        next()
      }
    } else {

    }
    accessToken = store.state.userAuth.access_token
    request.headers.set('Authorization', 'Bearer ' + accessToken)
  }
})

But it turns out some kind of pornography.
What is the best way to do this?