improve

things/nest/install-npm.sh

@@ -3,7 +3,9 @@ npm install --save \
 	class-validator \
 	class-transformer \
 	@nestjs/swagger \
+	@nestjs/config \
 	swagger-ui-express \
+	yaml
 
 npm install --save-dev \
 	@types/express

things/nest/src/app.module.ts

 import { Module } from '@nestjs/common';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
+import { ConfigModule } from '@nestjs/config';
+import { loadConfig } from './utility/config';
 
 @Module({
-  imports: [],
+  imports: [
+    ConfigModule.forRoot({
+      ignoreEnvVars: true,
+      load: [loadConfig],
+    }),
+  ],
   controllers: [AppController],
   providers: [AppService],
 })

things/nest/src/main.ts

@@ -2,6 +2,7 @@ import { NestFactory } from '@nestjs/core';
 import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
 import { NestExpressApplication } from '@nestjs/platform-express';
 import { AppModule } from './app.module';
+import { ConfigService } from '@nestjs/config';
 
 async function bootstrap() {
   const app = await NestFactory.create<NestExpressApplication>(AppModule);
@@ -17,6 +18,10 @@ async function bootstrap() {
   const document = SwaggerModule.createDocument(app, documentConfig);
   SwaggerModule.setup('docs', app, document);
 
-  await app.listen(3000);
+  const config = app.get(ConfigService);
+  await app.listen(
+    config.get<number>('port') || 3000,
+    config.get<string>('host') || '::',
+  );
 }
 bootstrap();