overleaf/services/web/frontend/js/features/editor-left-menu/controllers/left-menu-documentation-controller.js

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

export default App.controller(
  'LeftMenuDocumentationController',
  function ($scope, eventTracking) {
    $scope.sendLeftMenuDocumentationEvent = () => {
      eventTracking.sendMB('left-menu-documentation-click')
    }
  }
)