Edit.vue

<script>
  import Form from './Form'
  import { update } from '../services/Users' 
  
  export default {
    extends: Form,
    methods: {
      performSave() {
        const hideLoad = () => this.$loader.hide()
        this.$loader.show()
      
        update(this.user.id, this.user)
          .then(...)
          .then(hideLoad)
          .cath(hideLoad)
      },
    },
  }
</script>

<template>...</template>

<style>...</style>