overleaf/services/web/frontend/js/ide/toolbar/EditorLoaderController.js

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

App.controller('EditorLoaderController', function ($scope, localStorage) {
  $scope.$watch('editor.showVisual', function (val) {
    localStorage(
      `editor.mode.${$scope.project_id}`,
      val === true ? 'rich-text' : 'source'
    )
  })

  $scope.$watch('editor.newSourceEditor', function (val) {
    localStorage(
      `editor.source_editor.${$scope.project_id}`,
      val === true ? 'cm6' : 'ace'
    )
  })
})