Constant not injected to config() - angularjs

Question

I'm trying to modularize my first angular project. Need to make my module views relative to this module. In example below i have sample main module, that require controllers module. I can inject VIEWS_PATH to controller, but no to config(). As i know constant can be injected into config(). What is wrong with that ?
mainModule.js
angular.module('mainModule', ['app.main.controllers'])
.constant('VIEWS_PATH', 'js/modules/main/views');
controllersMain.js
angular.module('app.main.controllers', [])
.config(function($routeProvider, VIEWS_PATH) { // error
$routeProvider.when('/hello', {
templateUrl: VIEWS_PATH+'/hello.html',
controller: 'HelloController'
})
})
.controller('HelloController', function($scope, VIEWS_PATH) {
$scope.hello = 'Hello World!';
console.log('VIEWS_PATH: '+VIEWS_PATH); // ok
});

Answer 1

It's because you defined your VIEWS_PATH constant in one module -mainModule and you're trying to use it in a different module - app.main.controllers.
You can define that constant in app.main.controllers module if you wish to use it in the configuration of that module.
angular.module('app.main.controllers', [])
.constant('VIEWS_PATH', 'js/modules/main/views')
.config(function($routeProvider, VIEWS_PATH) {
$routeProvider.when('/hello', {
templateUrl: VIEWS_PATH+'/hello.html',
controller: 'HelloController'
});
});
But Constants from app.main.controllers module will work in mainModule as it listed as dependency in mainModule like below.
angular.module('mainModule', ['app.main.controllers']);
For example, let's say we defined two modules - MyApp & SomeModule
var someModule = angular.module('SomeModule',['someOtherModule']);
someModule.constant('SOME_CONSTANT','SomeValue');
var myApp = angular.module('MyApp',['SomeModule']);
myApp.constant('TEST_CONSTANT','Test');
myApp.config(function(SOME_CONSTANT){
console.log("from dependent module "+SOME_CONSTANT);
});
With the above setup, SOME_CONSTANT from SomeModule can be used in MyApp but TEST_CONSTANT from MyApp cannot be used in SomeModule.
Here's a sample Pen in action.