JSFiddle - React, Tailwind, and code Playground

HTML

<div id="app">
  
</div>

JavaScript

var app = new Vue({
  el: '#app',
  created () {
  	console.log('created')
    window.addEventListener('beforeunload', this.removeUser)
  },
  data: {
    
  },
  methods: {
  	removeUser () {
    	console.log('removing user')
    }
  }
})