fix: detect Next.js route groups as valid project structure

packages/utility/src/path.ts

@@ -84,7 +84,15 @@ export const isTargetFile = (
     }
 
     const dirName = normalize(path.dirname(targetFile));
-    return potentialPaths.some((p) => normalize(p) === dirName);
+    return potentialPaths.some((p) => {
+        const normalizedP = normalize(p);
+        if (normalizedP === dirName) return true;
+        // Support Next.js route groups: match files inside (group) subdirectories
+        // e.g., app/(marketing)/layout.tsx should match potentialPath 'app'
+        const parentDir = normalize(path.dirname(dirName));
+        const groupDir = path.basename(dirName);
+        return parentDir === normalizedP && /^\([^)]+\)$/.test(groupDir);
+    });
 };
 
 export const isRootLayoutFile = (

packages/utility/test/path.test.ts

@@ -190,4 +190,24 @@ describe('isTargetFile', () => {
         const targetFile = 'src/components/layout.tsx';
         expect(isRootLayoutFile(targetFile)).toBe(false);
     });
+
+    test('returns true for layout in a Next.js route group under app/', () => {
+        expect(isRootLayoutFile('app/(marketing)/layout.tsx')).toBe(true);
+    });
+
+    test('returns true for layout in a Next.js route group under src/app/', () => {
+        expect(isRootLayoutFile('src/app/(dashboard)/layout.tsx')).toBe(true);
+    });
+
+    test('returns true for layout in route group with jsx extension', () => {
+        expect(isRootLayoutFile('app/(app)/layout.jsx')).toBe(true);
+    });
+
+    test('returns false for layout nested deeper than one route group level', () => {
+        expect(isRootLayoutFile('app/(app)/nested/layout.tsx')).toBe(false);
+    });
+
+    test('returns false for layout in directory that looks like route group but is not', () => {
+        expect(isRootLayoutFile('app/marketing/layout.tsx')).toBe(false);
+    });
 });