log functions exceeding the 250MB size limit by vikhyathdevadiga · Pull Request #14067 · vercel/vercel

vikhyathdevadiga · 2025-10-08T05:46:32Z

Adds opt-in serverless function size analysis (requires an environment variable VERCEL_ANALYZE_BUILD_OUTPUT=1) to detect and report functions exceeding the 250MB uncompressed size limit. The output will contain:

Functions that exceed the size limit with their total uncompressed size
A breakdown of the top 10 largest dependencies
A summary of normal functions under the limit

Note

Low Risk Change

This PR adds opt-in build output analysis functionality gated by an environment variable to detect and report serverless functions exceeding size limits, with no security, auth, or data integrity changes.

Adds new analysis functions to detect functions exceeding 250MB size limit
Feature gated behind VERCEL_ANALYZE_BUILD_OUTPUT=1 environment variable
Throws NowBuildError when functions exceed size limit

^{Risk assessment for commit facf1d5.}

changeset-bot · 2025-10-08T05:46:38Z

🦋 Changeset detected

Latest commit: facf1d5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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vercel	Minor

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github-actions · 2025-10-08T05:47:39Z

🧪 Unit Test Strategy

Comparing: ef1be64 → facf1d5 (view diff)

Strategy: Affected packages only

✅ Only testing packages that have been modified or depend on modified packages.

Affected packages - 1 (3%)

vercel

Unaffected packages - 39 (98%)

@vercel-internals/get-package-json
@vercel/backends
@vercel/build-utils
@vercel/cervel
@vercel/cli-auth
@vercel/client
@vercel/config
@vercel/detect-agent
@vercel/edge
@vercel/elysia
@vercel/error-utils
@vercel/express
@vercel/fastify
@vercel/firewall
@vercel/frameworks
@vercel/fs-detectors
@vercel/functions
@vercel/gatsby-plugin-vercel-builder
@vercel/go
@vercel/h3
@vercel/hono
@vercel/hydrogen
@vercel/koa
@vercel/nestjs
@vercel/next
@vercel/node
@vercel/oidc
@vercel/oidc-aws-credentials-provider
@vercel/python
@vercel/python-analysis
@vercel/redwood
@vercel/related-projects
@vercel/remix-builder
@vercel/routing-utils
@vercel/ruby
@vercel/rust
@vercel/static-build
@vercel/static-config
examples

Results

Unit tests: Only affected packages will run unit tests
E2E tests: Handled separately (Version Packages PRs or run-e2e-tests label)
Type checks: Only affected packages will run type checks

This comment is automatically generated based on the affected testing strategy

packages/cli/src/commands/build/index.ts

…s-exceeding-250mb # Conflicts: # packages/cli/src/commands/build/index.ts

analyzeSingleFunction only measured FileFsRef entries from filePathMap, missing FileBlob files, zipBuffer contents, and .vc-config.json itself. Now walks the .func directory to capture those, then adds filePathMap entries (which live outside .func).

github-actions · 2026-02-11T13:04:30Z

📦 CLI Tarball Ready

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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and publish to npm yourself or [setup this action to publish automatically](https://github.com/changesets/action#with-publishing). If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## vercel@50.17.0 ### Minor Changes - Install builder packages on demand ([#15023](#15023)) - Display functions exceeding 250MB uncompressed size limit with total size and breakdown of largest dependencies (requires environment variable VERCEL_ANALYZE_BUILD_OUTPUT=1). ([#14067](#14067)) ### Patch Changes - Add `--format=json` option to `vercel integration list` and show project name in table header when results are scoped to a project ([#15007](#15007)) - Fix builder import resolution from pre-installed depenencies ([#15041](#15041)) - Services routing improvements: ([#15018](#15018)) - Fix route ownership scoping so parent service catch-alls (e.g. Vite SPA fallback) don't capture sibling service prefixes - Move shared ownership-guard helpers (`getOwnershipGuard`, `scopeRouteSourceToOwnership`) to `@vercel/routing-utils` - Place runtime service function outputs under internal `/_svc/<service>/index` namespace to prevent filesystem path leakage - Block `/_svc` as a reserved routePrefix in service validation - Scope all builder-emitted routes (not just route-owning builders) to their service ownership before merging - Updated dependencies \[]: - @vercel/static-build@2.8.37 - @vercel/build-utils@13.4.0 - @vercel/next@4.15.28 - @vercel/redwood@2.4.9 - @vercel/rust@1.0.5 ## @vercel/client@17.2.41 ### Patch Changes - Updated dependencies \[[`3cd0b559f1815fdb13f7aa05114bae2b0b0b0e68`](3cd0b55)]: - @vercel/routing-utils@5.3.3 - @vercel/build-utils@13.4.0 ## @vercel/fs-detectors@5.8.6 ### Patch Changes - Services routing improvements: ([#15018](#15018)) - Fix route ownership scoping so parent service catch-alls (e.g. Vite SPA fallback) don't capture sibling service prefixes - Move shared ownership-guard helpers (`getOwnershipGuard`, `scopeRouteSourceToOwnership`) to `@vercel/routing-utils` - Place runtime service function outputs under internal `/_svc/<service>/index` namespace to prevent filesystem path leakage - Block `/_svc` as a reserved routePrefix in service validation - Scope all builder-emitted routes (not just route-owning builders) to their service ownership before merging - Updated dependencies \[[`3cd0b559f1815fdb13f7aa05114bae2b0b0b0e68`](3cd0b55)]: - @vercel/routing-utils@5.3.3 - @vercel/frameworks@3.17.1 ## @vercel/routing-utils@5.3.3 ### Patch Changes - Services routing improvements: ([#15018](#15018)) - Fix route ownership scoping so parent service catch-alls (e.g. Vite SPA fallback) don't capture sibling service prefixes - Move shared ownership-guard helpers (`getOwnershipGuard`, `scopeRouteSourceToOwnership`) to `@vercel/routing-utils` - Place runtime service function outputs under internal `/_svc/<service>/index` namespace to prevent filesystem path leakage - Block `/_svc` as a reserved routePrefix in service validation - Scope all builder-emitted routes (not just route-owning builders) to their service ownership before merging  > [!NOTE] > Low Risk Change > > This PR is an automated Changesets release that only updates version numbers in package.json files and adds changelog entries - no source code changes are present. > > - Deletes changeset markdown files after consuming them > - Bumps version numbers in 4 package.json files > - Adds changelog entries documenting previous changes > > <sup>Risk assessment for [commit 9186d29](https://github.com/vercel/vercel/commit/9186d293adee9d555b8582f5c1d0cec87689acf1).</sup>  Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

feat: log functions exceeding 250mb

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fix file path

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use statSync and glob

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fix size calculation and path handling

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vikhyathdevadiga marked this pull request as ready for review October 9, 2025 13:13

vikhyathdevadiga requested a review from a team as a code owner October 9, 2025 13:13

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display large dependencies

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Merge branch 'main' into vikhyath/log-functions-exceeding-250mb

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jeffsee55 approved these changes Feb 10, 2026

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vikhyathdevadiga added 2 commits February 11, 2026 15:21

Merge remote-tracking branch 'origin/main' into vikhyath/log-function…

44262c9

…s-exceeding-250mb # Conflicts: # packages/cli/src/commands/build/index.ts

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vikhyathdevadiga merged commit f278d46 into main Feb 13, 2026
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vikhyathdevadiga deleted the vikhyath/log-functions-exceeding-250mb branch February 13, 2026 03:31

vercel-release-bot mentioned this pull request Feb 13, 2026

Version Packages #15035

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