Grunt uglify causing JS error after minification of AngularJS code

When working with AngularJS, we pass parameters using dependency injection. For instance,

function checkInCtrl ($scope, $rootScope, $location, $http){
…..
….
}

However, when the code is minified, it looks like this:

function checkInCtrl(a,b,c,d){
}

As a result, 'a', 'b', 'c', and 'd' are not recognized as '$scope', '$rootScope', '$location', and '$http' by Angular, causing the code to fail. To address this, AngularJS provides a solution:

checkInCtrl.$inject = ['$scope', '$rootScope', $location', '$http'];

Using the above syntax allows for injecting different dependencies. This method worked well until employing custom Angular services as dependencies.

For example,

function checkInCtrl ($scope, $rootScope, $location, $http){
…..
….
}

This setup works fine with the given solution. However, if the function includes:

function checkInCtrl ($scope, $rootScope, $location, $http, customService){
…..
….
}

Where 'customService' may be defined as:

angular.module(customService, ['ngResource'])
                .factory('abc', function($resource) {
                                return $resource('/abc');
                })

In such cases, the minified version of the code may not be interpreted correctly by Angular.

Due to project time constraints, we didn't delve deep into this issue and proceeded without minifying the controllers. The primary question here is whether this issue is inherent in Angular or if there was an error on my part that led to its malfunctioning. And, if this problem indeed exists, what would be the solution?

javascriptangularjsdependency-injectiongruntjsuglifyjs

Answer №1

In order to correctly point to the appropriate dependency in the minified version, you must utilize the string-injection based syntax:

function checkInCtrl ($scope, $rootScope, $location, $http){}

This should be transformed into:

['$scope', '$rootScope', '$location', '$http', function checkInCtrl ($scope, $rootScope, $location, $http){}]

Answer №2

Hello Navdeep,

I have a simpler solution for you to handle dependency injection in your project. You can use the ngmin Grunt plugin, which eliminates the need for manual handling of dependencies like what you did before with Bixi.

All you need to do is ensure that you have the grunt-ngmin installed and call it before the uglify task in your Gruntfile.js:

ngmin: {
  dist: {
    files: [{
      expand: true,
      cwd: '.tmp/concat/scripts',
      src: '*.js',
      dest: '.tmp/concat/scripts'
    }]
  }
},

....

grunt.registerTask('build', [
  'ngmin',
  'uglify',
]);

Answer №3

Just a heads up, ngMin is no longer recommended and has been marked as deprecated. It's best to switch over to using ngAnnotate, which integrates seamlessly with both grunt and gulp.

Answer №4

When trying to get uglify and minify to work, I discovered that it can expose instances where injected variables are altered from something like $scope to 'a'. For example: Consider the following code:

controller: function($scope) {
        $scope.showValidation= false;
        this.showValidation = function(){
            $scope.showValidation = true;
        };
    }

After undergoing minification and uglification, the code transforms to:

controller:function(a){a.showValidation=!1,this.showValidation=function(){a.showValidation=!0}}

This change causes an error because 'a' is not equivalent to $scope.

The solution is to explicitly declare the injected variables:

controller: ['$scope', function($scope) {
        $scope.showValidation= false;
        this.showValidation = function(){
            $scope.showValidation = true;
        };
    }]

After minifying and uglifying, the code becomes:

controller:["$scope",function(a){a.showValidation=!1,this.showValidation=function(){a.showValidation=!0}}]

Now, 'a' correctly corresponds to $scope.

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