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Must Fix Before Deploy

Fixing Build Failures

Getting "npm run build exited with code 1"? There may be issues in your code or missing dependencies.

TL;DR

1) Read the error message carefully (which file, which line) 2) If TypeScript error, it's a type issue 3) If Module not found, install the package 4) Run npm install then build again

심각코드: BUILD_FAIL

Error: Command "npm run build" exited with 1

원인

An error occurred during build script execution. This could be caused by TypeScript type errors, missing modules, or syntax errors.

해결책
  1. Check the full error message in the terminal
  2. Find the file and line number where the error occurred
  3. Run npm run build locally to see if the same error occurs
  4. Copy the error message and ask AI about it
주의

Module not found: Can't resolve 'package-name'

원인

A package imported in your code is not installed.

해결책
npm install package-name
주의

Type error: Property 'xxx' does not exist on type 'yyy'

원인

TypeScript detected a type mismatch. The type of a variable or function doesn't match.

해결책
  1. Check the type of the variable
  2. Add the type definition if it's missing
  3. Can temporarily fix with any type (not recommended)

Common Build Errors

1. Dependency Issues

Terminal
# Delete node_modules and reinstall
rm -rf node_modules package-lock.json
npm install

# Or clear the cache
npm cache clean --force
npm install

2. Missing Environment Variables

If required environment variables are missing during build, it will fail. Verify that environment variables are set in your CI/CD environment.

Info

Set them in Settings → Environment Variables on Cloudflare Pages, Vercel, etc.

3. TypeScript Strict Mode

To temporarily relax TypeScript's strict type checking:

tsconfig.json
{
  "compilerOptions": {
    "strict": false,           // Temporary fix (not recommended)
    "noImplicitAny": false,    // Allow any
    "skipLibCheck": true       // Skip library type checking
  }
}

Warning

This is a temporary workaround. It's best to fix type errors at their root cause.

4. Test Build Locally

Always verify that the build succeeds locally before deploying:

Terminal
# Run build
npm run build

# Preview build output
npm run preview

Prerequisites

  • You can reproduce npm run build locally.
  • You can read full error logs with file path and line numbers.
  • You can verify lockfile consistency (npm/pnpm/yarn).

Validation

  1. Local build succeeds without blocking errors.
  2. CI/CD build for the same commit also succeeds.
  3. Preview/runtime checks pass on key routes after build.

Troubleshooting

  • Ensure Node.js version is consistent between local and CI.
  • Regenerate dependencies from lockfile with clean install.
  • Prefer fixing type errors rather than relaxing strict options permanently.

References

Related Articles

Environment Variable Error

process.env.XXX is undefined

SPA 404 Error

404 on page refresh after deployment

Last updated: February 22, 2026 · Version: v0.0.1

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