vue-router / START_LOCATION
START_LOCATION 
ts
const START_LOCATION: RouteLocationNormalizedLoaded;Initial route location where the router is. Can be used in navigation guards to differentiate the initial navigation.
Example 
js
import { START_LOCATION } from 'vue-router'
router.beforeEach((to, from) => {
  if (from === START_LOCATION) {
    // initial navigation
  }
})
