# v0 on Debugging the ISR deployment problem

# Question

When trying to deploy your example to Vercel, I've got an error:

A Serverless Function has exceeded the unzipped maximum size of 250 MB

Here is the full log:

[22:08:47.803] Running build in Washington, D.C., USA (East) – iad1
[22:08:47.952] Retrieving list of deployment files...
[22:08:48.490] Downloading 82 deployment files...
[22:08:56.216] Restored build cache from previous deployment (7F4PndeqLFxgk3LvtijPYy8SHo7r)
[22:08:56.342] Running "vercel build"
[22:08:57.553] Vercel CLI 39.2.0
[22:08:58.244] Detected `pnpm-lock.yaml` version 9 generated by pnpm@9.x
[22:08:58.268] Installing dependencies...
[22:08:59.269] Lockfile is up to date, resolution step is skipped
[22:08:59.419] Already up to date
[22:08:59.907] 
[22:08:59.922] Done in 1.5s
[22:08:59.946] Detected Next.js version: 15.0.2
[22:08:59.964] Running "pnpm run build"
[22:09:00.767] 
[22:09:00.767] > nextra-docs-template@1.0.0 build /vercel/path0
[22:09:00.768] > next build
[22:09:00.768] 
[22:09:02.981]    ▲ Next.js 15.0.2
[22:09:02.982] 
[22:09:03.105]    Creating an optimized production build ...
[22:09:08.033] - [33mwarn[0m [nextra] Init git repository failed Discover git repo from [/vercel/path0] failed: could not find repository at '/vercel/path0'; class=Repository (6); code=NotFound (-3)
[22:10:11.317]  ✓ Compiled successfully
[22:10:11.324]    Linting and checking validity of types ...
[22:10:11.530]    Collecting page data ...
[22:10:15.055]    Generating static pages (0/41) ...
[22:10:18.778]    Generating static pages (10/41) 
[22:10:18.779]    Generating static pages (20/41) 
[22:10:32.622]    Generating static pages (30/41) 
[22:10:32.624]  ✓ Generating static pages (41/41)
[22:10:32.624] /vercel/path0/data
[22:10:32.624] ""
[22:10:32.625] ""
[22:10:41.931]    Finalizing page optimization ...
[22:10:41.933]    Collecting build traces ...
[22:11:08.810] 
[22:11:08.826] Route (app)                                           Size     First Load JS
[22:11:08.826] ┌ ○ /_not-found                                       897 B           101 kB
[22:11:08.826] └ ● /blog/[id]                                        137 B          99.9 kB
[22:11:08.827]     ├ /blog/1
[22:11:08.827]     ├ /blog/2
[22:11:08.827]     ├ /blog/3
[22:11:08.827]     └ [+7 more paths]
[22:11:08.828] + First Load JS shared by all                         99.7 kB
[22:11:08.828]   ├ chunks/3940710d-8bc0c1562b0390ff.js               52.6 kB
[22:11:08.828]   ├ chunks/610-44c9479a9ebc9a86.js                    45.2 kB
[22:11:08.828]   └ other shared chunks (total)                       1.94 kB
[22:11:08.829] 
[22:11:08.829] Route (pages)                                         Size     First Load JS
[22:11:08.829] ┌ ○ / (533 ms)                                        2.9 kB          167 kB
[22:11:08.832] ├   /_app                                             0 B             160 kB
[22:11:08.834] ├ ● /_meta                                            249 B           160 kB
[22:11:08.834] ├ ○ /404 (811 ms)                                     1.61 kB         166 kB
[22:11:08.834] ├ ○ /advanced (806 ms)                                1.61 kB         166 kB
[22:11:08.834] ├ ● /advanced/_meta                                   256 B           160 kB
[22:11:08.834] ├ ○ /advanced/accesing-config (805 ms)                3.17 kB         167 kB
[22:11:08.834] ├   └ css/3d60d0aceaeb37d9.css                        122 B
[22:11:08.836] ├ ○ /advanced/at-alias (805 ms)                       2.54 kB         167 kB
[22:11:08.836] ├ ƒ /api/auth/[...nextauth]                           0 B             160 kB
[22:11:08.836] ├ ƒ /api/github-repos/[username]                      0 B             160 kB
[22:11:08.837] ├ ƒ /api/restricted                                   0 B             160 kB
[22:11:08.837] ├ ● /auth/_meta                                       251 B           160 kB
[22:11:08.837] ├ ○ /auth/login (804 ms)                              1.92 kB         166 kB
[22:11:08.837] ├ ○ /auth/restricted (805 ms)                         2.31 kB         166 kB
[22:11:08.837] ├ ○ /clientComponent (804 ms)                         2.91 kB         167 kB
[22:11:08.837] ├ ○ /clientSideProtectedExample (535 ms)              2.29 kB         166 kB
[22:11:08.838] ├ ƒ /clientSideProtectedExampleDynamicPage            2.89 kB         171 kB
[22:11:08.838] ├ ○ /code (533 ms)                                    1.98 kB         166 kB
[22:11:08.838] ├ ● /context                                          1.61 kB         166 kB
[22:11:08.838] ├ ƒ /dynamic-mdx                                      2.33 kB         171 kB
[22:11:08.838] ├ ƒ /dynamic-post-building                            2.33 kB         171 kB
[22:11:08.838] ├ ● /dynamic-post-building-getstaticprops (14387 ms)  2.34 kB         171 kB
[22:11:08.838] ├ ● /FileReader                                       1.92 kB         166 kB
[22:11:08.839] ├ ● /get-static-props (ISR: 60 Seconds) (623 ms)      2.81 kB         167 kB
[22:11:08.839] ├ ● /get-static-props-readfile                        1.91 kB         166 kB
[22:11:08.839] ├ ○ /intro-to-components (532 ms)                     3.13 kB         167 kB
[22:11:08.839] ├   └ css/a0786626dbb3c2b6.css                        105 B
[22:11:08.839] ├ ○ /ISR (807 ms)                                     5.27 kB         169 kB
[22:11:08.840] ├ ○ /live (532 ms)                                    87.6 kB         252 kB
[22:11:08.840] ├ ○ /passinginfo (532 ms)                             2 kB            166 kB
[22:11:08.840] ├ ● /posts/[id] (1871 ms)                             662 B           160 kB
[22:11:08.840] ├   └ css/096e8b2b15818a7e.css                        575 B
[22:11:08.840] ├   ├ /posts/2024-12-08-leccion (625 ms)
[22:11:08.841] ├   └ /posts/2024-12-09-leccion (624 ms)
[22:11:08.841] ├ ○ /protected/secret (528 ms)                        2.24 kB         166 kB
[22:11:08.841] ├ ● /readFile (561 ms)                                1.57 kB         166 kB
[22:11:08.841] ├ ƒ /serverSideProtectedExample                       416 B           160 kB
[22:11:08.841] ├ ○ /swr (663 ms)                                     3.31 kB         172 kB
[22:11:08.842] ├ ƒ /user/[username]                                  803 B           160 kB
[22:11:08.842] └ ○ /userRepos                                        2.52 kB         167 kB
[22:11:08.842]     └ css/42ff6ee1a7e6fab4.css                        625 B
[22:11:08.842] + First Load JS shared by all                         174 kB
[22:11:08.843]   ├ chunks/framework-415c6982541a665e.js              44.8 kB
[22:11:08.843]   ├ chunks/main-586ee97ea7b75755.js                   37.9 kB
[22:11:08.843]   ├ chunks/pages/_app-d04133c3a4c78923.js             75.2 kB
[22:11:08.843]   ├ css/396771fc71f5a51c.css                          14.7 kB
[22:11:08.844]   └ other shared chunks (total)                       1.74 kB
[22:11:08.844] 
[22:11:08.847] ƒ Middleware                                          57.4 kB
[22:11:08.848] 
[22:11:08.848] ○  (Static)   prerendered as static content
[22:11:08.849] ●  (SSG)      prerendered as static HTML (uses generateStaticParams)
[22:11:08.849]    (ISR)      incremental static regeneration (uses revalidate in generateStaticParams)
[22:11:08.849] ƒ  (Dynamic)  server-rendered on demand
[22:11:08.849] 
[22:11:09.252] Traced Next.js server files in: 200.149ms
[22:11:13.088] Warning: Max serverless function size of 250 MB uncompressed reached
[22:11:13.089] Serverless Function's page: FileReader.js
[22:11:13.093] Large Dependencies                                                          Uncompressed size
[22:11:13.093] .next/cache/webpack                                                                 279.42 MB
[22:11:13.093] node_modules/.pnpm/next@15.0.2_react-dom@18.3.1_react@18.3.1__react@18.3.1            8.08 MB
[22:11:13.094] node_modules/.pnpm/react-dom@18.3.1_react@18.3.1                                      1.64 MB
[22:11:13.094] .github/screenshot.png                                                              867.74 KB
[22:11:13.096] .next/trace                                                                         746.51 KB
[22:11:13.096] 
[22:11:13.097] All dependencies                                                                    284.38 MB
[22:11:13.097] Max serverless function size was exceeded for 1 function
[22:11:13.165] Created all serverless functions in: 3.907s
[22:11:13.263] Collected static files (public/, static/, .next/static): 26.67ms
[22:11:13.446] Build Completed in /vercel/output [2m]
[22:11:13.850] Deploying outputs...
[22:11:32.077] Error: A Serverless Function has exceeded the unzipped maximum size of 250 MB. : https://vercel.link/serverless-function-size
[22:11:34.473]

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What is your diagnostic?

# Answer

DANGER

The error you're encountering is due to the size of your serverless function exceeding Vercel's limit of 250 MB uncompressed. This is a common issue when deploying large Next.js applications to Vercel. Let's break down the problem and provide some solutions:

Excessive Build Cache: The log shows that .next/cache/webpack is taking up 279.42 MB, which is the main culprit for exceeding the size limit.
Large Dependencies: While not the primary issue here, your node_modules folder is also contributing to the size.
Static Assets: There's a large screenshot file (.github/screenshot.png) that's being included in the deployment.

To resolve this issue, you can try the following steps:

Clear Build Cache: Before deploying, try clearing the Next.js build cache. You can do this by adding a build command in your package.json:

"scripts": {
  "vercel-build": "rm -rf .next && next build"
}

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"scripts": {
  "vercel-build": "rm -rf .next && next build"
}

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Then in your Vercel project settings, change the build command to npm run vercel-build or pnpm run vercel-build (depending on your package manager).

Optimize Dependencies: Review your dependencies and remove any that aren't necessary for production. You can use next/bundle-analyzer to identify large dependencies.
Exclude Non-Essential Files: Create a .vercelignore file in your project root to exclude files not needed in production, like the large screenshot:

.github

.github

Use Output File Tracing: Next.js 12 introduced output file tracing, which can significantly reduce the size of serverless functions. Ensure it's enabled in your next.config.js:

module.exports = {
  experimental: {
    outputFileTracingRoot: undefined, // undefined means it will use the package root
  },
}

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module.exports = {
  experimental: {
    outputFileTracingRoot: undefined, // undefined means it will use the package root
  },
}

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Consider Using Edge Functions: If possible, convert some of your API routes to Edge Functions, which have different size limits.
Split Your Application: If the application is still too large, consider splitting it into smaller sub-applications or using a monorepo structure.

After making these changes, try deploying again. If the issue persists, you might need to consider using a different deployment strategy, such as using Vercel's Edge Network or a traditional server deployment.

Let me know if you need help implementing any of these solutions or if you have any questions about this approach!