added config support

src/config/config.model.ts

+export interface IServerConfig {
+  port: number;
+}
+
+export interface IConfig {
+  server: IServerConfig;
+}

src/config/config.template.json

+{
+  "server": {
+    "port": 0
+  }
+}

src/config/index.ts

+import _config from './config.json';
+import { IConfig } from './config.model';
+
+const config = _config as IConfig;
+
+export const server = config.server;
+export default config;

src/main.ts

 import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
+import { server } from './config';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-  await app.listen(3000);
+  await app.listen(server.port);
 }
 bootstrap();

tsconfig.json

@@ -16,6 +16,7 @@
     "noImplicitAny": false,
     "strictBindCallApply": false,
     "forceConsistentCasingInFileNames": false,
-    "noFallthroughCasesInSwitch": false
+    "noFallthroughCasesInSwitch": false,
+    "resolveJsonModule": true
   }
 }