@Inject decorator for easily annotating dependency-injected class constructors

static/js/decorators/inject/inject.decorator.spec.ts

@@ -0,0 +1,17 @@
+import { Inject } from './inject.decorator';
+
+
+describe("Decorator: Inject", () => {
+
+  describe("parameter injection", () => {
+
+    it("adds given string to the 'inject' property of the annotated class", () => {
+      expect(ValidService.$inject).toContain('$scope');
+    });
+  });
+});
+
+
+class ValidService {
+  constructor(@Inject('$scope') private $scope: any) {}
+}

static/js/decorators/inject/inject.decorator.ts

@@ -0,0 +1,11 @@
+/**
+ * Adds the given value to the inject property of the annotated class.
+ * Used to annotate the constructor parameters of an AngularJS service/component class.
+ * @param value The string name of the dependency.
+ */
+export function Inject(value: string) {
+  return (target: any, propertyKey: string | symbol, parameterIndex: number): void => {
+    target.$inject = target.$inject || [];
+    target.$inject[parameterIndex] = value;
+  }
+}