Refactor: refactor get NODE_ENV

Author: sally0226

src/common/helper/env.helper.ts

@@ -4,19 +4,11 @@ import { NODE_ENVIRONMENT } from './env.validation';
 
 export const getNodeEnv = (() => {
   const env = process.env.NODE_ENV;
-
-  switch (env) {
-    case 'test':
-      return NODE_ENVIRONMENT.test;
-    case 'development':
-      return NODE_ENVIRONMENT.development;
-    case 'stage':
-      return NODE_ENVIRONMENT.stage;
-    case 'production':
-      return NODE_ENVIRONMENT.production;
-    default:
-      throw new InternalServerErrorException('Unknown NODE_ENV');
+  const nodeEnv = NODE_ENVIRONMENT[env];
+  if (nodeEnv === undefined) {
+    throw new InternalServerErrorException('Unknown NODE_ENV');
   }
+  return nodeEnv;
 })();
 
 export const isIgnoreEnvFile =

src/common/helper/env.validation.ts

@@ -18,7 +18,7 @@ export const NODE_ENVIRONMENT = {
   [stage]: stage,
   [production]: production,
   [test]: test,
-};
+} as const;
 
 export class EnvironmentVariables {
   @IsEnum(NODE_ENVIRONMENT)