feat(Joi + Jest): Add joi configuration and jest elements

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "build": "rimraf dist && tsc",
     "start": "npm run build && node dist/app.js",
-    "dev": "nodemon src/app.ts",
+    "dev": "nodemon --exec ts-node src/app.ts",
     "test": "jest",
     "test:watch": "jest --watch",
     "test:cov": "jest --coverage",
@@ -62,6 +62,7 @@
       "!**/*.util.(t|j)s",
       "!**/*.gateway.(t|j)s",
       "!**/*.schema.(t|j)s",
+      "!**/*.env.(t|j)s",
       "!**/*.dto.(t|j)s",
       "!**/*.module.(t|j)s"
     ],
@@ -70,7 +71,8 @@
   },
   "dependencies": {
     "dotenv": "^16.4.5",
-    "express": "^4.17.2"
+    "express": "^4.17.2",
+    "joi": "^17.13.3"
   },
   "devDependencies": {
     "@eslint/js": "^9.10.0",
@@ -89,6 +91,7 @@
     "nodemon": "^3.0.1",
     "rimraf": "^4.0.0",
     "ts-jest": "^29.2.5",
+    "ts-node": "^10.9.2",
     "typescript": "^5.0.0",
     "typescript-eslint": "^8.5.0"
   }

src/app.env.ts

@@ -0,0 +1,23 @@
+import * as dotenv from 'dotenv';
+import schema from './app.schema';
+
+dotenv.config();
+
+const { error, value: env } = schema.validate(process.env,
+	{ abortEarly: false }
+);
+
+if (error) {
+	console.error('Config validation error(s):');
+	error.details.forEach(detail => {
+		console.error(`- ${detail.message}`);
+	});
+	throw new Error('Environment variables validation failed.');
+}
+
+export default {
+	nodeEnv: env.NODE_ENV,
+	port: env.PORT,
+	databaseUrl: env.DATABASE_URL,
+	apiKey: env.API_KEY,
+}

src/app.schema.ts

@@ -0,0 +1,10 @@
+import * as Joi from 'joi';
+
+const schema = Joi.object({
+	NODE_ENV: Joi.string().valid('development', 'production', 'test').default('development'),
+	PORT: Joi.number().default(3000),
+	DATABASE_URL: Joi.string().uri().optional().default('db://localhost:5432'),
+	API_KEY: Joi.string().optional().default('sfn-notification-hub'),
+}).unknown();
+
+export default schema;