nextjs - 💡(How to fix) Fix TypeError: generate is not a function in build process with Next.js 15.5.3 (and persists in 14.2.32) [1 comments, 2 participants]

Link to the code that reproduces this issue

https://github.com/pcdesignstx/leadcraft

To Reproduce

1. Create a fresh Next.js project:

   npx create-next-app@14 my-app --typescript --tailwind --eslint --app --src-dir --import-alias "@/*" --use-npm
   cd my-app

2. Run the build command:

   npm run build

3. Observe the error:

   > Build error occurred
   TypeError: generate is not a function
       at generateBuildId (/path/to/node_modules/next/dist/build/generate-build-id.js:12:25)
       at /path/to/node_modules/next/dist/build/index.js:351:117

Note: Development server (npm run dev) works perfectly, only the build process fails.

Current vs. Expected behavior

Expected: The build should complete successfully and generate the .next directory for production deployment.

Actual: Build fails with TypeError: generate is not a function at the generateBuildId step, while npm run dev works perfectly.

Error Stack Trace:

TypeError: generate is not a function
    at generateBuildId (/Users/dyllonboynton/Desktop/LeadCraft/node_modules/next/dist/build/generate-build-id.js:12:25)
    at /Users/dyllonboynton/Desktop/LeadCraft/node_modules/next/dist/build/index.js:351:117
    at Span.traceAsyncFn (/Users/dyllonboynton/Desktop/LeadCraft/node_modules/next/dist/trace/trace.js:154:26)
    at getBuildId (/Users/dyllonboynton/Desktop/LeadCraft/node_modules/next/dist/build/index.js:351:63)
    at /Users/dyllonboynton/Desktop/LeadCraft/node_modules/next/dist/build/index.js:388:35
    at async Span.traceAsyncFn (/Users/dyllonboynton/Desktop/LeadCraft/node_modules/next/dist/build/index.js:154:26)
    at async build (/Users/dyllonboynton/Desktop/LeadCraft/node_modules/next/dist/build/index.js:368:9)

### Provide environment information

```bash
- **Operating System:** macOS 23.6.0 (Darwin Kernel Version 23.6.0) on ARM64
- **Node.js:** v18.20.7
- **NPM:** 10.8.2
- **Next.js:** 14.2.32 (originally encountered with 15.5.3)
- **NODE_ENV:** production (globally set)

Which area(s) are affected? (Select all that apply)

Not sure

Which stage(s) are affected? (Select all that apply)

next build (local)

Additional context

• ✅ Development server (npm run dev) works perfectly
• ❌ Build process (npm run build) fails consistently
• ❌ Issue persists across multiple Next.js versions (13.x, 14.x, 15.x)
• ❌ Issue persists with fresh installations and cleared caches
• ❌ Issue occurs with both local and npx installations
• ❌ Tried disabling SWC minification - no effect
• ❌ Cleared npm cache and reinstalled dependencies - no effect
• ❌ Issue first encountered with Next.js 15.5.3, persists after downgrading to 14.2.32

Troubleshooting attempts:

• Cleared npm cache with npm cache clean --force
• Removed and reinstalled node_modules
• Tried different Next.js versions (13.x, 14.x, 15.x)
• Added swcMinify: false to next.config.mjs
• Verified no global Next.js installations
• Confirmed Node.js and npm are working correctly

Impact: This prevents deployment to any platform that requires a successful build process (Vercel, Netlify, GitHub Pages, etc.).