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code/allapp/allapp-nest/src/app.service.ts

@@ -0,0 +1,14 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+@Injectable()
+export class AppService {
+  @Inject(ConfigService)
+  private configService: ConfigService;
+
+  getHello(): string {
+    console.log(this.configService.get('server.port'));
+
+    return 'Hello World!';
+  }
+}