Add asyncInitialization option to Service decorator

Author: Julien Heller

src/decorators/Service.ts

@@ -102,13 +102,15 @@ export function Service<T, K extends keyof T>(optionsOrServiceName?: ServiceOpti
                 service.multiple = (optionsOrServiceName as ServiceOptions<T, K>).multiple;
                 service.global = (optionsOrServiceName as ServiceOptions<T, K>).global || false;
                 service.transient = (optionsOrServiceName as ServiceOptions<T, K>).transient;
+                service.asyncInitialization = (optionsOrServiceName as ServiceOptions<T, K>).asyncInitialization;
 
             } else if (optionsOrServiceName) { // ServiceOptions
                 service.id = (optionsOrServiceName as ServiceOptions<T, K>).id;
                 service.factory = (optionsOrServiceName as ServiceOptions<T, K>).factory;
                 service.multiple = (optionsOrServiceName as ServiceOptions<T, K>).multiple;
                 service.global = (optionsOrServiceName as ServiceOptions<T, K>).global || false;
                 service.transient = (optionsOrServiceName as ServiceOptions<T, K>).transient;
+                service.asyncInitialization = (optionsOrServiceName as ServiceOptions<T, K>).asyncInitialization;
             }
 
             Container.set(service);

src/types/ServiceMetadata.ts

@@ -41,6 +41,11 @@ export interface ServiceMetadata<T, K extends keyof T> {
      */
     factory?: [ObjectType<T>, K]|((...params: any[]) => any);
 
+    /**
+     * Will call instance's #initialize method and resolve the promise it returns when getting with Container.getAsync() and Container.getManyAsync().
+     */
+    asyncInitialization?: boolean;
+
     /**
      * Instance of the target class.
      */