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Mirror node builder behavior in backends builder#15980

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jeffsee55 merged 2 commits into
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use-backends
Apr 16, 2026
Merged

Mirror node builder behavior in backends builder#15980
jeffsee55 merged 2 commits into
mainfrom
use-backends

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@jeffsee55

@jeffsee55 jeffsee55 commented Apr 15, 2026 •
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  • The node builder doesn't throw when no entrypoint is found, this updates the backends builder to do the same to minimize thrash from new behavior.
  • The node builder only runs tsc against entrypoipnt + it's module graph. The backends builder was just running tsc against the project
  • This also add support that we have in the node builder for package.json#main value being treated a potential entrypoint.

@jeffsee55 jeffsee55 marked this pull request as ready for review April 15, 2026 21:08
@jeffsee55 jeffsee55 requested a review from a team as a code owner April 15, 2026 21:08
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🦋 Changeset detected

Latest commit: 5323b38

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

This PR includes changesets to release 4 packages
Name Type
@vercel/backends Patch
@vercel/cervel Patch
vercel Patch
@vercel/express Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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📦 CLI Tarball Ready

The Vercel CLI tarball for this PR is now available!

Quick Test

You can test this PR's CLI directly by running:

npx https://vercel-1bqn95sn5.vercel.sh/tarballs/vercel.tgz --help

Use in vercel.json

To use this CLI version in your project builds, add to your vercel.json:

{
  "build": {
    "env": {
      "VERCEL_CLI_VERSION": "vercel@https://vercel-1bqn95sn5.vercel.sh/tarballs/vercel.tgz"
    }
  }
}

Python Runtime Wheel

A vercel-runtime wheel was also built for this PR.
To use in your Python project builds, also set this environment variable:

VERCEL_RUNTIME_PYTHON="vercel-runtime @ https://vercel-1bqn95sn5.vercel.sh/tarballs/vercel_runtime-0.13.0.dev1776358029+5323b38-py3-none-any.whl"

Python Workers Wheel

A vercel-workers wheel was also built for this PR.
To use in your Python project builds, also set this environment variable:

VERCEL_WORKERS_PYTHON="vercel-workers @ https://vercel-1bqn95sn5.vercel.sh/tarballs/vercel_workers-0.1.0.dev1776358029+5323b38-py3-none-any.whl"

@vercel

vercel Bot commented Apr 15, 2026 •
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Low Risk — Build tooling hardening — adds defensive error handling and existence checks to prevent build failures on missing files.

  • build.ts: wrap findEntrypoint calls to swallow errors for static-only output trees
  • rolldown/index.ts, nft.ts: add existsSync guards before tracking local files, skip ENOENT errors
  • typescript.ts: refactor from spawning tsc binary to using TypeScript compiler API directly

Assessed at 5323b38.

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🧪 Unit Test Strategy

Comparing: bab75d7 → 5323b38 (view diff)

Strategy: Code changed outside of a package - running all unit tests

⚠️ All unit tests will run because global code changes could impact all packages.

Affected packages - 18 (45%)
  1. @vercel/backends
  2. @vercel/cervel
  3. @vercel/express
  4. vercel
  5. @vercel/build-utils
  6. @vercel/client
  7. @vercel/firewall
  8. @vercel/fs-detectors
  9. @vercel/go
  10. @vercel/hydrogen
  11. @vercel/next
  12. @vercel/node
  13. @vercel/python
  14. @vercel/remix-builder
  15. @vercel/ruby
  16. @vercel/rust
  17. @vercel/static-build
  18. examples
Unaffected packages - 22 (55%)
  1. @vercel-internals/get-package-json
  2. @vercel/cli-auth
  3. @vercel/config
  4. @vercel/detect-agent
  5. @vercel/edge
  6. @vercel/elysia
  7. @vercel/error-utils
  8. @vercel/fastify
  9. @vercel/frameworks
  10. @vercel/functions
  11. @vercel/gatsby-plugin-vercel-builder
  12. @vercel/h3
  13. @vercel/hono
  14. @vercel/koa
  15. @vercel/nestjs
  16. @vercel/oidc
  17. @vercel/oidc-aws-credentials-provider
  18. @vercel/python-analysis
  19. @vercel/redwood
  20. @vercel/related-projects
  21. @vercel/routing-utils
  22. @vercel/static-config

Results

  • Unit tests: All affected packages will run unit tests
  • E2E tests: Running in parallel via E2E Tests workflow
  • Type checks: All affected packages will run type checks

This comment is automatically generated based on the affected testing strategy

@jeffsee55
feat(backends): programmatic TS typecheck and monorepo fixture
5323b38 
Use the TypeScript compiler API for entry-scoped checks without writing
temp tsconfigs. Consolidate cervel and main typescript helpers into one
module. Add tsconfig extends chain to the 17-turborepo fixture.

Made-with: Cursor
@jeffsee55 jeffsee55 changed the title Relax failures when we don't find an entrypoint for backends Mirror node builder behavior in backends builder Apr 16, 2026
@jeffsee55 jeffsee55 enabled auto-merge (squash) April 16, 2026 17:53
@jeffsee55 jeffsee55 merged commit 2babfa2 into main Apr 16, 2026
190 checks passed
@jeffsee55 jeffsee55 deleted the use-backends branch April 16, 2026 18:05
@vercel-cli-release-bot vercel-cli-release-bot mentioned this pull request Apr 16, 2026
Merged
jeffsee55 pushed a commit that referenced this pull request Apr 16, 2026
@vercel-cli-release-bot @github-actions
Version Packages (#16003)
7a5b910 
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 the packages will
be published to npm automatically. 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/backends@0.0.63

### Patch Changes

- Typecheck deployment TypeScript via the compiler API (entry + import
graph), deduplicate the cervel `typescript` module, and extend the
turborepo fixture with a chained `tsconfig` for monorepo path
resolution. ([#15980](#15980))

- Relax failures when we don't find an entrypoint for backends to
maximize backwards compatibility
([#15980](#15980))

- Updated dependencies
\[[`5219572d21a2ba4b49cc1c27d244c1ff5d76c591`](5219572)]:
    -   @vercel/build-utils@13.17.1

## @vercel/build-utils@13.17.1

### Patch Changes

- Align deserialize logic with existing callers.
([#16002](#16002))

## @vercel/cervel@0.0.50

### Patch Changes

- Updated dependencies
\[[`2babfa22946d80a92f1307a8d860a9039d695b09`](2babfa2),
[`2babfa22946d80a92f1307a8d860a9039d695b09`](2babfa2)]:
    -   @vercel/backends@0.0.63

## vercel@51.5.1

### Patch Changes

- Improve Claude Code Vercel plugin install and update prompts across
CLI commands. ([#15921](#15921))

- Updated dependencies
\[[`5219572d21a2ba4b49cc1c27d244c1ff5d76c591`](5219572),
[`2babfa22946d80a92f1307a8d860a9039d695b09`](2babfa2),
[`2babfa22946d80a92f1307a8d860a9039d695b09`](2babfa2),
[`adbe6f0a0152136aa26aa1277458f4578f62beeb`](adbe6f0)]:
    -   @vercel/build-utils@13.17.1
    -   @vercel/backends@0.0.63
    -   @vercel/python@6.33.2
    -   @vercel/elysia@0.1.66
    -   @vercel/express@0.1.76
    -   @vercel/fastify@0.1.69
    -   @vercel/go@3.5.0
    -   @vercel/h3@0.1.75
    -   @vercel/hono@0.2.69
    -   @vercel/hydrogen@1.3.6
    -   @vercel/koa@0.1.49
    -   @vercel/nestjs@0.2.70
    -   @vercel/next@4.16.8
    -   @vercel/node@5.7.8
    -   @vercel/redwood@2.4.12
    -   @vercel/remix-builder@5.7.2
    -   @vercel/ruby@2.3.2
    -   @vercel/rust@1.1.1
    -   @vercel/static-build@2.9.16

## @vercel/client@17.3.5

### Patch Changes

- Updated dependencies
\[[`5219572d21a2ba4b49cc1c27d244c1ff5d76c591`](5219572)]:
    -   @vercel/build-utils@13.17.1

## @vercel/elysia@0.1.66

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/node@5.7.8

## @vercel/express@0.1.76

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/node@5.7.8
    -   @vercel/cervel@0.0.50

## @vercel/fastify@0.1.69

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/node@5.7.8

## @vercel/fs-detectors@5.18.1

### Patch Changes

- Updated dependencies
\[[`5219572d21a2ba4b49cc1c27d244c1ff5d76c591`](5219572)]:
    -   @vercel/build-utils@13.17.1

## @vercel/gatsby-plugin-vercel-builder@2.1.16

### Patch Changes

- Updated dependencies
\[[`5219572d21a2ba4b49cc1c27d244c1ff5d76c591`](5219572)]:
    -   @vercel/build-utils@13.17.1

## @vercel/h3@0.1.75

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/node@5.7.8

## @vercel/hono@0.2.69

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/node@5.7.8

## @vercel/koa@0.1.49

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/node@5.7.8

## @vercel/nestjs@0.2.70

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/node@5.7.8

## @vercel/node@5.7.8

### Patch Changes

- Updated dependencies
\[[`5219572d21a2ba4b49cc1c27d244c1ff5d76c591`](5219572)]:
    -   @vercel/build-utils@13.17.1

## @vercel/python@6.33.2

### Patch Changes

- Update the error for custom installCommand builds >250MB.
([#15946](#15946))

## @vercel/static-build@2.9.16

### Patch Changes

-   Updated dependencies \[]:
    -   @vercel/gatsby-plugin-vercel-builder@2.1.16

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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@ShayCichocki ShayCichocki ShayCichocki approved these changes

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@jeffsee55 @ShayCichocki