nextjs - 💡(How to fix) Fix "Overly broad patterns" warnings during build [8 comments, 8 participants]

> turbopack-warning-repro@1.0.0 build
> next build

   ▲ Next.js 16.0.0 (Turbopack)

   Creating an optimized production build ...
Turbopack build encountered 2 warnings:
./src/actions/files.ts:32:24
The file pattern ('/ROOT/public/' <dynamic> '/' <dynamic> | '/ROOT/public' <dynamic> '/' <dynamic> | '/ROOT/public/' <dynamic> | '/ROOT/public' <dynamic>) matches 16000 files in [project]/
  30 |
  31 |   // This also triggers the warning
> 32 |   const resolvedPath = path.resolve(
     |                        ^^^^^^^^^^^^^
> 33 |     baseDir,
     | ^^^^^^^^^^^^
> 34 |     userPath.replace(/^\//, ""),
     | ^^^^^^^^^^^^
> 35 |     fileName
     | ^^^^^^^^^^^^
> 36 |   );
     | ^^^^
  37 |
  38 |   return resolvedPath;
  39 | }

Overly broad patterns can lead to build performance issues and over bundling.

Import trace:
  Server Component:
    ./src/actions/files.ts
    ./src/app/page.tsx


./src/actions/files.ts:20:22
The file pattern ('/ROOT/public/media/' <dynamic> '/' <dynamic> | '/ROOT/public/media' <dynamic> '/' <dynamic> | '/ROOT/public/media/' <dynamic> | '/ROOT/public/media' <dynamic>) matches 32000 files in [project]/
  18 |   // This line triggers the warning:
  19 |   // "The file pattern matches X files... Overly broad patterns can lead to build performance issues"
> 20 |   const targetPath = path.join(mediaDir, folder, filename);
     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  21 |
  22 |   return targetPath;
  23 | }

Overly broad patterns can lead to build performance issues and over bundling.

Import trace:
  Server Component:
    ./src/actions/files.ts
    ./src/app/page.tsx


 ✓ Compiled successfully in 862.8ms
 ✓ Finished TypeScript in 650.1ms    
 ✓ Collecting page data in 162.0ms    
 ✓ Generating static pages (3/3) in 214.6ms
 ✓ Finalizing page optimization in 3.7ms    

Route (app)
┌ ○ /
└ ○ /_not-found


○  (Static)  prerendered as static content

---

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Sun, 19 Oct 2025 19:21:18 +0000
  Available memory (MB): 61858
  Available CPU cores: 16
Binaries:
  Node: 22.20.0
  npm: 10.9.3
  Yarn: N/A
  pnpm: N/A
Relevant Packages:
  next: 16.0.0 // Latest available version is detected (16.0.0).
  eslint-config-next: N/A
  react: 19.2.0
  react-dom: 19.2.0
  typescript: 5.9.3
Next.js Config:
  output: N/A