Is it necessary for me to specify the $http service when using other services in AngularJS?

angular.module("ABC.services").service("configService", [
  'loggerService', function(logger, $http) {
    debugger;
    return this.get = function(onError, onSuccess) {
      return $http.get("/api/config/").success(function(config) {
        logger.debug('loaded config');
        return onSuccess(config);
      }).error(onError);
    };
  }
]);

(I have a more advanced logger than just using $log)

When I reach the debugger line, I've noticed that $http is undefined unless I include '$http' in the list of dependencies. The AngularJS documentation does not cover this scenario explicitly. Their example of native service injection appears like:

angular.module('myModule', [], function($provide) {

If I am also using one of my own services, would I need to declare $provide as a dependency? I'm uncertain about when I can expect the automatic injection of $ services and when I must manually declare them.

Answer №1

Modules should only be injected when they are being used in the code. If a module is not being utilized, there is no need to inject it. In the example you mentioned, the $provide is injected because it is being used in the code.

When using array notation to inject modules, the modules declared in the array must match the parameters in the function. For instance:

angular.module("ABC.services").service("configService", [
  'loggerService', '$http', function(logger, $http) {

Alternatively, without using array notation:

angular.module("ABC.services").service("configService", function(loggerService, $http) { ...

The benefit of using array notation is that it helps protect against minification.

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