Cacher is the code snippet organizer for pro developers

var params = $window.location.search.substring(1);
  
  if(params && $window.opener) {
    var pair = params.split('=');
    $window.opener.postMessage(pair[1], $window.location.origin);
  }
  
      var popup = this.$window.open('auth/facebook', '', 'width=500, height=500');
    this.$window.focus();
    this.$window.addEventListener('message', (e) => {
      if(e.data === 'yes') {
        popup.close();
      }
    })