Added check for Service option

Author: Julien Heller

src/container-instance.class.ts

@@ -6,6 +6,7 @@ import { Constructable } from './types/constructable.type';
 import { ServiceIdentifier } from './types/service-identifier.type';
 import { ServiceMetadata } from './interfaces/service-metadata.interface.';
 import { AsyncInitializedService } from './types/AsyncInitializedService';
+import { MissingInitializedPromiseError } from './error/MissingInitializedPromiseError';
 
 
 /**
@@ -495,8 +496,12 @@ export class ContainerInstance {
 
     if (type) this.applyPropertyHandlers(type, value);
 
-    if (value instanceof AsyncInitializedService) {
-      return new Promise(resolve => {
+    if (value instanceof AsyncInitializedService || service.asyncInitialization) {
+      return new Promise((resolve) => {
+        if (!(value._initialized instanceof Promise) && service.asyncInitialization) {
+            throw new MissingInitializedPromiseError(service.value);
+        }
+        
         value._initialized.then(() => resolve(value));
       });
     }

src/error/MissingInitializedPromiseError.ts

@@ -0,0 +1,19 @@
+/**
+ * Thrown when DI cannot inject value into property decorated by @Inject decorator.
+ */
+export class MissingInitializedPromiseError extends Error {
+    name = "MissingInitializedPromiseError";
+
+    constructor(value: any) {
+        super(
+          (value._initialized
+              ? `asyncInitialization: true was used, but ${value.name}#_initialized is not a Promise. `
+              : `asyncInitialization: true was used, but ${value.name}#_initialized is undefined. `) +
+          `You will need to either extend the abstract AsyncInitializedService class, or assign ` +
+          `${value.name}#_initialized to a Promise in your class' constructor that resolves when all required ` +
+          `initialization is complete.`
+        );
+        Object.setPrototypeOf(this, MissingInitializedPromiseError.prototype);
+    }
+
+}