overleaf/services/web/frontend/js/main/subscription/upgrade-subscription.js

import App from '../../base'

export default App.controller('UpgradeSubscriptionController', function(
  $scope,
  eventTracking
) {
  $scope.upgradeSubscription = function() {
    eventTracking.send('subscription-funnel', 'subscription-page', 'upgrade')
  }
})