JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-controller='mainCtrl'>
    
    <foo></foo>
    
</div>

JavaScript

var app = angular.module('myApp', [])

app.controller('mainCtrl', function($scope) {
    
    
});


app.directive('foo',function() {
 
    return {
        restrict: 'E',
        link: function(scope,iElement,iAttrs) {
            
            scope.message = "directive message";
            
            scope.alertFunction = function() {
              alert("testing function");   
            }
            
            
            
        },
        template: "<div ng-click='alertFunction()'> this is the alert message : {{message}} </div>"
    }
    
  
});

app.config( function( $provide ) {
    
        
    $provide.decorator('fooDirective',function($delegate) {
        
        var directive = $delegate[0];
        
        var link = directive.link;
        
        directive.compile = function() {
          return function(scope, element, attrs) {
           
            link.apply(this, arguments);
              
              scope.alertFunction = function() {
                  alert(scope.message); // using directive message variable, but overriding the alertFunction method
              }
              
          }
        }
        
        return $delegate;
    });

    
});