auto.$provide.value()

Register a value service with the $injector, such as a string, a number, an array, an object or a function. This is short for registering a service where its provider's $get property is a factory function that takes no arguments and returns the value service. That also means it is not possible to inject other services into a value service.

Value services are similar to constant services, except that they cannot be injected into a module configuration function (see angular.Module) but they can be overridden by an Angular decorator.