How Does AngularJS Dependency Injection Handle Minification, and What\'s the Best Practice?

AngularJS Dependency Injection Minification Considerations

The AngularJS dependency injection mechanism presents challenges when minifying JavaScript. The default dependency injection syntax utilizes function declarations, which can be problematic during minification.

Standard Injection Syntax

Before:

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

During minification, variables $scope and $http may be renamed, breaking the dependency injection system.

Inject-Style Syntax

To resolve this issue, it is recommended to use the inject-style syntax:

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

In this syntax, the dependency array is passed as a string, preserving the identity of the dependencies during minification.

Always Use Inject-Style?

Yes, it is advisable to always use the inject-style syntax. This ensures that the dependency injection system will function correctly even after minification.

Additional Options

As an alternative, you can use the ng-annotate npm package during your build process to avoid the need for verbose inject-style syntax. Ng-annotate analyzes your JavaScript code and adds dependency annotations to function declarations, making them minification-safe.

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