Enhance Error Handling and File Access Middleware for CDN File Service

jest.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\.ts$': 'ts-jest',
+    '^.+\\.js$': 'babel-jest'
+  },
+  transformIgnorePatterns: [
+    'node_modules/(?!(@my-project|other-project)/)'
+  ],
+  moduleFileExtensions: ['ts', 'js', 'json', 'node']
+};