diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..69937db
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,48 @@
+import js from '@eslint/js';
+import globals from 'globals';
+import jestPlugin from 'eslint-plugin-jest';
+
+export default [
+  // Base ESLint recommended rules
+  js.configs.recommended,
+  
+  // Main configuration
+  {
+    files: ['**/*.js'],
+    languageOptions: {
+      ecmaVersion: 2022,
+      sourceType: 'module',
+      globals: {
+        ...globals.node,
+        ...globals.es6,
+        ...globals.jest
+      }
+    },
+    plugins: {
+      jest: jestPlugin
+    },
+    rules: {
+      // Core ESLint rules
+      'semi': ['error', 'always'],
+      'quotes': ['error', 'single', { 'avoidEscape': true }],
+      'no-console': 'off',
+      'no-unused-vars': ['error', { 'argsIgnorePattern': '^_' }],
+      
+      // Jest plugin rules
+      'jest/no-disabled-tests': 'warn',
+      'jest/no-focused-tests': 'error',
+      'jest/no-identical-title': 'error',
+      'jest/prefer-to-have-length': 'warn',
+      'jest/valid-expect': 'error'
+    }
+  },
+  
+  // Ignore patterns (equivalent to .eslintignore)
+  {
+    ignores: [
+      'node_modules/**',
+      'dist/**',
+      'coverage/**'
+    ]
+  }
+];
diff --git a/package-lock.json b/package-lock.json
index 04d70bb..7299c7b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,10 +13,11 @@
         "ejs": "^3.1.10"
       },
       "devDependencies": {
-        "@vercel/ncc": "^0.38.1",
+        "@eslint/js": "^9.25.0",
         "esbuild": "^0.25.2",
         "eslint": "^9.25.0",
         "eslint-plugin-jest": "^28.11.0",
+        "globals": "^16.0.0",
         "jest": "^29.7.0",
         "mock-fs": "^5.5.0",
         "tmp-promise": "^3.0.3"
@@ -1103,6 +1104,19 @@
         "url": "https://opencollective.com/eslint"
       }
     },
+    "node_modules/@eslint/eslintrc/node_modules/globals": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/@eslint/js": {
       "version": "9.25.0",
       "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.25.0.tgz",
@@ -2009,16 +2023,6 @@
         "url": "https://opencollective.com/eslint"
       }
     },
-    "node_modules/@vercel/ncc": {
-      "version": "0.38.3",
-      "resolved": "https://registry.npmjs.org/@vercel/ncc/-/ncc-0.38.3.tgz",
-      "integrity": "sha512-rnK6hJBS6mwc+Bkab+PGPs9OiS0i/3kdTO+CkI8V0/VrW3vmz7O2Pxjw/owOlmo6PKEIxRSeZKv/kuL9itnpYA==",
-      "dev": true,
-      "license": "MIT",
-      "bin": {
-        "ncc": "dist/ncc/cli.js"
-      }
-    },
     "node_modules/acorn": {
       "version": "8.14.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.14.1.tgz",
@@ -3269,9 +3273,9 @@
       }
     },
     "node_modules/globals": {
-      "version": "14.0.0",
-      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
-      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+      "version": "16.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-16.0.0.tgz",
+      "integrity": "sha512-iInW14XItCXET01CQFqudPOWP2jYMl7T+QRQT+UNcR/iQncN/F0UNpgd76iFkBPgNQb4+X3LV9tLJYzwh+Gl3A==",
       "dev": true,
       "license": "MIT",
       "engines": {
diff --git a/package.json b/package.json
index 9ca9796..b0c2f93 100644
--- a/package.json
+++ b/package.json
@@ -33,10 +33,11 @@
     "ejs": "^3.1.10"
   },
   "devDependencies": {
-    "@vercel/ncc": "^0.38.1",
+    "@eslint/js": "^9.25.0",
     "esbuild": "^0.25.2",
     "eslint": "^9.25.0",
     "eslint-plugin-jest": "^28.11.0",
+    "globals": "^16.0.0",
     "jest": "^29.7.0",
     "mock-fs": "^5.5.0",
     "tmp-promise": "^3.0.3"
diff --git a/src/helpers/ComposerHelper.js b/src/helpers/ComposerHelper.js
index 1ed25a4..b240481 100644
--- a/src/helpers/ComposerHelper.js
+++ b/src/helpers/ComposerHelper.js
@@ -43,7 +43,7 @@ export class ComposerHelper {
       await fs.access(classmapPath);
       return true;
     } catch (error) {
-      throw new Error(`Could not find classmap at ${classmapPath}. Make sure you've run composer with the --optimize flag.`);
+      throw new Error(`Could not find classmap at ${classmapPath}. Make sure you've run composer with the --optimize flag. Internal error: ${error}`);
     }
   }
 }