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                <body ng-app="app">
  <div ng-controller="parentController as ctrl">
    <my-directive on-timeout="ctrl.onTimeout()"></my-directive>




                // declare our main module
angular.module('app', []);

// add our controller to the 
.controller('parentController', [function() {
   this.onTimeout = () => 'value from onTimeout in parentController';

// note camelCase, in html it will be hyphenated: `my-directive`
.directive('myDirective', function() {
  return {
    // we restrict it to be an element, so it can be used only as a tag
    restrict: 'E',
    // following best practices, we allow only certain props
    scope: {
      // please note that in html it is `on-timeout`
      onTimeout: '&onTimeout'
    controller: ['$scope', '$timeout', function($scope, $timeout) {
      this.value = 'Initial string';

      // this will reflect in the DOM!
      $timeout(() => {
        this.value = $scope.onTimeout();
      }, 500);
    controllerAs: 'myCtrl',
    template: `
        {{ myCtrl.value }}