overleaf/services/web/frontend/js/main/importing.js

import App from '../base'
App.controller('ImportingController', function(
  $interval,
  $scope,
  $timeout,
  $window
) {
  $interval(function() {
    $scope.state.load_progress += 5
    if ($scope.state.load_progress > 100) {
      $scope.state.load_progress = 20
    }
  }, 500)
  $timeout(function() {
    $window.location.reload()
  }, 5000)
  $scope.state = {
    load_progress: 20
  }
})