refactor: setup project mode

.env.example

@@ -1,3 +1,5 @@
+NODE_ENV=production
+
 DB_HOST=127.0.0.1
 DB_PORT=3306
 DB_USERNAME=cophr

src/config/env.validation.ts

@@ -1,7 +1,23 @@
 import { plainToInstance } from "class-transformer";
-import { IsNotEmpty, IsNumber, IsString, validateSync } from "class-validator";
+import {
+  IsEnum,
+  IsNotEmpty,
+  IsNumber,
+  IsString,
+  validateSync,
+} from "class-validator";
+
+export enum Environment {
+  Development = "development",
+  Production = "production",
+  Test = "test",
+  Provision = "provision",
+}
 
 class EnvironmentVariables {
+  @IsEnum(Environment)
+  NODE_ENV: Environment = Environment.Production;
+
   @IsString()
   @IsNotEmpty()
   DB_HOST: string;

src/main.ts

@@ -4,11 +4,14 @@ import { DocumentBuilder, SwaggerModule } from "@nestjs/swagger";
 import * as dotenv from "dotenv";
 
 import { AppModule } from "./app.module";
+import { Environment } from "./config/env.validation";
 
 dotenv.config();
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-  setupSwagger(app);
+  if (process.env.NODE_ENV !== Environment.Production) {
+    setupSwagger(app);
+  }
   await app.listen(3000);
 }