[Solved] AngularJS Dependency Injection when no dependencies

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Because angular.module('app') with 1 parameter has a different function – to get an already existing module without having a code reference to it.

The reason this:

angular.module('app', []); // Define the module.
angular.module('app'); // Get the module.

works as well as this:

var app = angular.module('app', []); // Define the module and assign to variable.

solved AngularJS Dependency Injection when no dependencies