fix: ensure that shutdown works in loaderOnly mode (#6893)

packages/modules-sdk/src/medusa-module.ts

@@ -119,16 +119,18 @@ export class MedusaModule {
   }
   public static async onApplicationShutdown(): Promise<void> {
     await promiseAll(
-      [...MedusaModule.instances_.values()].map(instances => {
-        return Object.values(instances).map((instance: IModuleService) => {
+      [...MedusaModule.instances_.values()]
+        .map((instances) => {
+          return Object.values(instances).map((instance: IModuleService) => {
             return instance.__hooks?.onApplicationShutdown
               ?.bind(instance)()
               .catch(() => {
                 // The module should handle this and log it
                 return void 0
               })
+          })
         })
-      }).flat()
+        .flat()
     )
   }
 
@@ -262,14 +264,13 @@ export class MedusaModule {
     let finishLoading: any
     let errorLoading: any
 
+    const loadingPromise = new Promise((resolve, reject) => {
+      finishLoading = resolve
+      errorLoading = reject
+    })
+
     if (!loaderOnly) {
-      MedusaModule.loading_.set(
-        hashKey,
-        new Promise((resolve, reject) => {
-          finishLoading = resolve
-          errorLoading = reject
-        })
-      )
+      MedusaModule.loading_.set(hashKey, loadingPromise)
     }
 
     let modDeclaration =
@@ -330,6 +331,7 @@ export class MedusaModule {
     const services = {}
 
     if (loaderOnly) {
+      finishLoading(services)
       return services
     }