diff --git a/eslint.config.js b/eslint.config.js
index b2e2883..0f0ea2c 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -105,9 +105,31 @@ module.exports = [
       '@typescript-eslint/consistent-type-imports': ['error', { prefer: 'type-imports' }]
     }
   },
-  // Test files (JavaScript and TypeScript)
+  // Test files (JavaScript)
   {
-    files: ['test/**/*.js', '**/*.test.js', 'test/**/*.ts', '**/*.test.ts'],
+    files: ['test/**/*.js', '**/*.test.js'],
+    languageOptions: {
+      ecmaVersion: 'latest',
+      sourceType: 'commonjs',
+      globals: {
+        jest: 'readonly',
+        describe: 'readonly',
+        test: 'readonly',
+        it: 'readonly',
+        expect: 'readonly',
+        beforeEach: 'readonly',
+        afterEach: 'readonly',
+        beforeAll: 'readonly',
+        afterAll: 'readonly'
+      }
+    },
+    rules: {
+      'no-console': 'off'
+    }
+  },
+  // Test files (TypeScript)
+  {
+    files: ['test/**/*.ts', '**/*.test.ts'],
     languageOptions: {
       parser: tsparser,
       parserOptions: {
@@ -127,6 +149,9 @@ module.exports = [
         afterAll: 'readonly'
       }
     },
+    plugins: {
+      '@typescript-eslint': tseslint
+    },
     rules: {
       'no-console': 'off',
       '@typescript-eslint/no-explicit-any': 'off' // Allow any in tests for mocking
diff --git a/jest.config.js b/jest.config.js
index 9c0ac89..575f4b0 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -8,9 +8,7 @@ module.exports = {
     '**/test/e2e/scenarios/**/*.test.{js,ts}'
   ],
   transform: {
-    '^.+\\.ts$': ['ts-jest', {
-      isolatedModules: true
-    }],
+    '^.+\\.ts$': 'ts-jest',
     '^.+\\.js$': 'babel-jest'
   },
   moduleFileExtensions: ['ts', 'js', 'json'],
diff --git a/src/controllers/githubController.ts b/src/controllers/githubController.ts
index 2d255dc..4cde922 100644
--- a/src/controllers/githubController.ts
+++ b/src/controllers/githubController.ts
@@ -117,7 +117,7 @@ export const handleWebhook: WebhookHandler = async (req, res) => {
     // Validate request body structure for webhook processing
     // Use Object.prototype.toString for secure type checking to prevent bypass
     const bodyType = Object.prototype.toString.call(req.body);
-    if (bodyType !== '[object Object]' || req.body === null || req.body === undefined) {
+    if (bodyType !== '[object Object]') {
       logger.error('Webhook request missing or invalid body structure');
       return res.status(400).json({ error: 'Missing or invalid request body' });
     }
diff --git a/tsconfig.json b/tsconfig.json
index 0042c95..c0082ae 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -28,6 +28,7 @@
     "allowUnreachableCode": false,
     "noFallthroughCasesInSwitch": true,
     "noErrorTruncation": true,
+    "isolatedModules": true,
     "types": ["node", "jest"]
   },
   "include": [