How Can I Prevent AngularJS Dependency Injection Issues During Minification?

Preserving Injection Names in AngularJS Minification

Minifying JavaScript code can introduce issues in AngularJS's dependency injection system. When minification removes variable and function names, it can break the identity that AngularJS relies on to match dependencies to their controllers.

Traditional Method

To avoid this problem, the traditional approach was to declare controllers using an anonymous function with the dependencies as an array of strings. This preserves the dependency names during minification:

var MyController = ['$scope', '$http', function($scope, $http) {
  // ...
}];

Inject Method

However, the preferred method in modern versions of AngularJS is to use the inject syntax for dependency injection. This allows the dependency names to be defined even more explicitly and accurately preserves their identity during minification:

var MyController = function($scope, $http) {
  $http.get('https://api.github.com/repos/angular/angular.js/commits')
    .then(function(response) {
      $scope.commits = response.data
    })
};
MyController.$inject = ['$scope', '$http'];

Recommendation

Always use the inject method for dependency injection in AngularJS. It ensures that the dependency names are preserved during minification, preventing potential injection errors.

Alternatives

For convenience, you can use the ng-annotate npm package as part of your build process. This tool will automatically add the $inject property to your controllers, reducing the verbosity of the annotation syntax.

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