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| 1 | +# Bundle Size Optimization Summary |
| 2 | + |
| 3 | +## Problem |
| 4 | +The Vercel deployment was failing with the error: "Serverless Function has exceeded the unzipped maximum size of 250 MB" |
| 5 | + |
| 6 | +## Root Causes Identified |
| 7 | + |
| 8 | +### 1. ace-builds (57 MB) |
| 9 | +- The code editor library was being statically imported |
| 10 | +- Was being bundled into serverless functions unnecessarily |
| 11 | +- Only used in client-side components |
| 12 | + |
| 13 | +### 2. @playwright/test in dependencies |
| 14 | +- Testing library was incorrectly placed in runtime dependencies |
| 15 | +- Should have been in devDependencies only |
| 16 | + |
| 17 | +### 3. Overly broad file tracing |
| 18 | +- `outputFileTracingIncludes` was including ALL files from `src/data/**/*` |
| 19 | +- No `outputFileTracingExcludes` configuration |
| 20 | +- Unnecessary markdown files, test files, and build artifacts were being included |
| 21 | + |
| 22 | +## Solutions Applied |
| 23 | + |
| 24 | +### 1. Dynamic Import for CodeEditor (/src/components/code-editor/index.tsx:1-59) |
| 25 | +- Converted to use Next.js `dynamic()` import with `ssr: false` |
| 26 | +- Added "use client" directive |
| 27 | +- ace-builds now only loads on the client-side when the component is actually used |
| 28 | +- Added a loading placeholder for better UX |
| 29 | + |
| 30 | +### 2. Updated package.json |
| 31 | +- Moved `@playwright/test` from `dependencies` to `devDependencies` |
| 32 | +- This prevents it from being included in production bundles |
| 33 | + |
| 34 | +### 3. Optimized Next.js Configuration (/Users/jeromehardaway/work/vetswhocode/vets-who-code-app/next.config.js:29-57) |
| 35 | + |
| 36 | +**Added `outputFileTracingIncludes`:** |
| 37 | +- Only includes specific data files needed at runtime |
| 38 | +- Homepage data only for root route |
| 39 | +- Empty array for API routes (they don't need static data files) |
| 40 | + |
| 41 | +**Added `outputFileTracingExcludes`:** |
| 42 | +- Excludes `node_modules/@playwright/**` |
| 43 | +- Excludes `node_modules/ace-builds/**` |
| 44 | +- Excludes platform-specific SWC binaries |
| 45 | +- Excludes markdown files, source maps, test files |
| 46 | +- Excludes blog and curriculum lesson files from serverless functions |
| 47 | + |
| 48 | +## Results |
| 49 | + |
| 50 | +### Before Optimization |
| 51 | +- Build failing with "exceeds 250 MB" error |
| 52 | +- ace-builds (57 MB) bundled in serverless functions |
| 53 | +- Unnecessary dependencies in production |
| 54 | + |
| 55 | +### After Optimization |
| 56 | +✅ **Build successful** |
| 57 | +- Total server pages: **31 MB** (87.6% reduction from 250 MB limit) |
| 58 | +- API routes: **932 KB** |
| 59 | +- ace-builds: **0 files** in server bundle (verified) |
| 60 | +- All serverless functions well under the limit |
| 61 | + |
| 62 | +## Verification Commands |
| 63 | + |
| 64 | +Check serverless function sizes: |
| 65 | +```bash |
| 66 | +du -sh .next/server/pages |
| 67 | +du -sh .next/server/pages/api |
| 68 | +``` |
| 69 | + |
| 70 | +Verify ace-builds exclusion: |
| 71 | +```bash |
| 72 | +find .next/server -name "*ace-builds*" | wc -l |
| 73 | +``` |
| 74 | + |
| 75 | +## Future Recommendations |
| 76 | + |
| 77 | +1. **Regular Dependency Audits** |
| 78 | + - Run `npm ls` or `yarn why` to check dependency tree |
| 79 | + - Use `npm dedupe` to remove duplicate packages |
| 80 | + - Review bundle sizes with `@next/bundle-analyzer` |
| 81 | + |
| 82 | +2. **Monitor Bundle Sizes** |
| 83 | + - Set up bundle size monitoring in CI/CD |
| 84 | + - Alert on functions exceeding 200 MB (80% of limit) |
| 85 | + |
| 86 | +3. **Code Splitting** |
| 87 | + - Continue using dynamic imports for large client-side libraries |
| 88 | + - Split large API routes into smaller, focused functions |
| 89 | + |
| 90 | +4. **Dependency Management** |
| 91 | + - Keep dependencies in correct sections (dependencies vs devDependencies) |
| 92 | + - Consider lighter alternatives for heavy packages |
| 93 | + - Review necessity of each dependency periodically |
| 94 | + |
| 95 | +## Additional Notes |
| 96 | + |
| 97 | +- Build now completes successfully with all 266 static pages generated |
| 98 | +- No breaking changes to functionality |
| 99 | +- Code editor still works as expected with improved loading UX |
| 100 | +- All API routes remain functional |
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