feat($rti): a runtime injected function proxy provider

src/common.js

@@ -364,3 +364,34 @@ angular.module('ui.router.state', ['ui.router.router', 'ui.router.util']);
 angular.module('ui.router', ['ui.router.state']);
 
 angular.module('ui.router.compat', ['ui.router']);
+
+/**
+ * $rtiProvider: Runtime Injector Provider
+ * Declare functions that are injected at runtime within config blocks.
+ * Creates a no-argument function proxy. The target `injectedFunction` will be injected
+ * when the no-argument proxy is invoked.
+ */
+angular.module('ui.router').provider('$rti', function() {
+  var _injector;
+
+  this.invoke = function(injectedFunction, self, locals) {
+    if (_injector === undefined) throw new Error("Can only be used at runtime");
+    return _injector.invoke(injectedFunction, self || this, locals);
+  };
+
+  this.makeRuntimeFn = function(injectedFunction, self, locals) {
+    return function() {
+      return invoke(injectedFunction, self, locals);
+    }
+  };
+
+  this.$get = ['$injector', function($injector) {
+    _injector = $injector;
+    return { };
+  }];
+
+  return this;
+});
+
+angular.module('ui.router').run(function($rtiProvider) { });
+