chore: added support for forFeatureAsync

Author: Ashish Kumar

src/http/http.module.ts

@@ -1,4 +1,10 @@
-import { DynamicModule, Module, Provider } from "@nestjs/common";
+import {
+  DynamicModule,
+  FactoryProvider,
+  Module,
+  ModuleMetadata,
+  Provider,
+} from "@nestjs/common";
 import { HttpModule as NestHttpModule } from "@nestjs/axios";
 
 import { HttpService } from "./http.service";
@@ -83,4 +89,38 @@ export class HttpModule {
       provider,
     };
   }
+
+  static forFeatureAsync(options: {
+    serviceName: string;
+    imports?: ModuleMetadata["imports"];
+    inject?: FactoryProvider["inject"];
+    useFactory: (
+      ...args: any[]
+    ) =>
+      | Promise<Omit<IHttpModuleOptions, "serviceName">>
+      | Omit<IHttpModuleOptions, "serviceName">;
+  }): DynamicModule {
+    const {
+      serviceName = "HttpService",
+      imports,
+      inject,
+      useFactory,
+    } = options;
+
+    const provider = {
+      provide: serviceName,
+      useFactory: async (...args: any[]) => {
+        const config = await useFactory(...args);
+        return new HttpService(config);
+      },
+      inject: inject || [],
+    };
+
+    return {
+      module: HttpModule,
+      imports: imports || [],
+      providers: [provider],
+      exports: [provider],
+    };
+  }
 }

src/test/HttpModule.spec.ts

@@ -1,4 +1,5 @@
 import { Test, TestingModule } from "@nestjs/testing";
+import { DynamicModule, FactoryProvider, ModuleMetadata } from "@nestjs/common";
 
 import { HttpModule } from "../http/http.module"; // Adjust the import path as necessary
 import { HttpService } from "../http/http.service";
@@ -62,4 +63,23 @@ describe("HttpModule", () => {
     expect(serviceOne).toBeInstanceOf(HttpService);
     expect(serviceTwo).toBeInstanceOf(HttpService);
   });
+
+  it("should handle asynchronous dynamic configuration", async () => {
+    const asyncConfig = {
+      imports: [] as ModuleMetadata["imports"],
+      inject: [] as FactoryProvider["inject"],
+      useFactory: async () => ({
+        config: { baseURL: "http://async-config.com" },
+      }),
+      serviceName: "AsyncService",
+    };
+
+    const asyncModule = HttpModule.forFeatureAsync(asyncConfig);
+    const featureModule = await Test.createTestingModule({
+      imports: [asyncModule],
+    }).compile();
+    const asyncHttpService = featureModule.get<HttpService>("AsyncService");
+
+    expect(asyncHttpService).toBeInstanceOf(HttpService);
+  });
 });