adds nodeEnv to src/config/config

src/config/config.ts

@@ -2,15 +2,20 @@
 
 export interface IConfig {
   mongodbUri: string;
+  nodeEnv: string;
 }
 
 class Config implements IConfig {
   private static instance: Config;
 
   public readonly mongodbUri: string;
+  public readonly nodeEnv: string;
+
 
   private constructor() {
     this.mongodbUri = process.env.MONGODB_URI || 'mongodb://localhost:27017/dailytrends';
+    this.nodeEnv = process.env.NODE_ENV || 'development';
+
     this.validateConfig();
   }
 
@@ -26,6 +31,18 @@ class Config implements IConfig {
       throw new Error('MONGODB_URI is required');
     }
   }
+
+  public isDevelopment(): boolean {
+    return this.nodeEnv === 'development';
+  }
+
+  public isProduction(): boolean {
+    return this.nodeEnv === 'production';
+  }
+
+  public isTest(): boolean {
+    return this.nodeEnv === 'test';
+  }
 }
 
 export const config = Config.getInstance();