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low-code-react-app-b/docs/BUILD_TROUBLESHOOTING.md

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# Build Troubleshooting Guide
## Common Build Issues
### "cp: cannot create regular file '/tmp/dist/proxy.js': No such file or directory"
**Symptoms:**
- Build completes successfully with all assets generated in `dist/` folder
- Final line shows error: `cp: cannot create regular file '/tmp/dist/proxy.js': No such file or directory`
- Message "Copying extra files..." appears before the error
**Root Cause:**
This error occurs when the Spark runtime build orchestration system attempts to copy runtime proxy files to a temporary directory that doesn't exist. This is an external post-build step that happens AFTER the Vite build completes successfully.
**Impact:**
- **Low to None**: The actual application build succeeds completely
- All application assets are correctly generated in the `dist/` folder
- The error occurs during optional runtime file copying
- The built application will function normally
**Solutions:**
1. **Ignore the error** (Recommended for development):
- The Vite build succeeded and generated all necessary files
- The `dist/` folder contains a complete, working build
- This error does not affect application functionality
2. **Fix for CI/CD pipelines**:
- Ensure the CI/CD system creates the `/tmp/dist/` directory before building
- Add to your CI/CD workflow:
```yaml
- name: Pre-build setup
run: mkdir -p /tmp/dist
```
3. **Fix for local builds**:
- Create the directory manually:
```bash
mkdir -p /tmp/dist
npm run build
```
**Related Files:**
- Build output: `dist/` (application build - this is what matters)
- Runtime proxy: `packages/spark-tools/dist/runtimeProxy.js`
- Vite config: `vite.config.ts`
### Successful Build Indicators
Even with the proxy.js copying error, your build is successful if you see:
✓ All these asset files in `dist/`:
- `index.html`
- `assets/index-*.js` (main bundle)
- `assets/react-vendor-*.js`
- `assets/ui-core-*.js`
- `assets/*.css`
- And other chunked assets
✓ Message: `✓ built in X.XXs`
✓ No TypeScript compilation errors
## Other Common Issues
### TypeScript Compilation Errors
If you see TypeScript errors during build:
```bash
npm run build
```
Fix by addressing the specific TypeScript errors shown, or temporarily bypass with:
```bash
npm run build -- --force
```
### Out of Memory Errors
If Node.js runs out of memory during build:
```bash
NODE_OPTIONS="--max-old-space-size=4096" npm run build
```
### Vite Port Already in Use (Dev Server)
```bash
npm run kill # Kills process on port 5000
npm run dev
```
### Missing Dependencies
```bash
npm install --legacy-peer-deps
```
## Build Performance
Current build produces:
- **Main bundle**: ~474 KB (148 KB gzipped)
- **React vendor**: Separated chunk
- **UI components**: Split into core and extended chunks
- **Icons**: ~241 KB (55 KB gzipped)
- **Total build time**: ~16s
Code splitting ensures users only download what they need for each route.