I am using vue-cli for front-end and lumen for back-end and I am curious about what is a best practice to store API root-url and endpoints in vue ? 
Now I have constants.js file in src directory where API root-url and endpoints are like that:
const BASE_URL = "http://localhost:8000"
export const AddLanguge = BASE_URL + "/api/languages"
and when I need for example to implement add language functionality in component I import required API endpoint from constants.js like that:
import { AddLanguge } from '@/constants'
and then use axios to make request
this.$http.post(AddLanguge, params).then(response => {
   if (response.status == 200) {
       this.addLanguage(response.data.data)
   } else {
       this.setHttpResponseDialog(response)
   }
}).catch(er => {
       this.setHttpResponseDialog("Error")
})
I searched this question, but there is no clear answer some say: it's ok.
Others say: it's bad you must store that kind of data in dev.env.js and prod.env.js, and most important fact here is I don't get why are they saying so, why is it important to save that data in .env files? Or maybe is there some other better way?
Can you guys provide a right answer with good explanation or if there is no right answer and it depends on situation how can I decide which way is suitable for my case?
 
    