Add Bundling handler to vanilla node workflows by ShayCichocki · Pull Request #15691 · vercel/vercel

ShayCichocki · 2026-03-23T20:21:18Z

Description

To optimize performance we want to bundle vanillaJS packages behind experimentalAllowBundling to reduce the number of lambdas created in fluid compute

changeset-bot · 2026-03-23T20:21:31Z

🦋 Changeset detected

Latest commit: 5f4aa5d

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

This PR includes changesets to release 9 packages

Name	Type
@vercel/node	Minor
vercel	Patch
@vercel/elysia	Patch
@vercel/express	Patch
@vercel/fastify	Patch
@vercel/h3	Patch
@vercel/hono	Patch
@vercel/koa	Patch
@vercel/nestjs	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

github-actions · 2026-03-23T20:23:25Z

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vercel · 2026-03-23T20:23:25Z

Warning

High Risk — Cross-app shared package change — bug in bundling handler could break all vanilla API routes using this feature.

packages/node/src/build.ts: adds bundling logic gated by env var + zeroConfig, sets experimentalAllowBundling flag
packages/node/src/bundling-handler.js: new unified Lambda handler that routes requests via x-matched-path header
packages/node/test/unit/bundling.test.ts: comprehensive tests for bundling feature and handler runtime

^{Assessed at 5f4aa5d.}

github-actions · 2026-03-23T20:24:39Z

🧪 Unit Test Strategy

Comparing: 26156e7 → 5f4aa5d (view diff)

Strategy: Affected packages only

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

Affected packages - 9 (23%)

@vercel/elysia
@vercel/express
@vercel/fastify
@vercel/h3
@vercel/hono
@vercel/koa
@vercel/nestjs
@vercel/node
vercel

Unaffected packages - 31 (78%)

@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/error-utils
@vercel/firewall
@vercel/frameworks
@vercel/fs-detectors
@vercel/functions
@vercel/gatsby-plugin-vercel-builder
@vercel/go
@vercel/hydrogen
@vercel/next
@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: Running in parallel via E2E Tests workflow
Type checks: Only affected packages will run type checks

This comment is automatically generated based on the affected testing strategy

packages/node/src/serverless-functions/bundled-api-handler.mts

packages/node/test/unit/bundling.test.ts

packages/node/src/bundling-handler.js

packages/node/src/build.ts

packages/node/src/bundling-handler.js

ijjk

Amazing LFGTM 🙌

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/[email protected] ### Minor Changes - Add experimental bundling to node bundler ([#15691](#15691)) ## [email protected] ### Patch Changes - Improve `vercel link` by searching matching project names across teams by default, with clearer linking choices when multiple matches are found. ([#15400](#15400)) - Updated dependencies \[[`a50d9615ea546050b9f37dc7e5b4a81228987eef`](a50d961), [`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] - @vercel/[email protected] - @vercel/[email protected] - @vercel/[email protected] - @vercel/[email protected] - @vercel/[email protected] - @vercel/[email protected] - @vercel/[email protected] - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Updated dependencies \[[`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Updated dependencies \[[`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Updated dependencies \[[`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Updated dependencies \[[`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Updated dependencies \[[`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Updated dependencies \[[`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Updated dependencies \[[`aa3ad226ef7b4ab98ef97e15f81c91f4f7c527e9`](aa3ad22)]: - @vercel/[email protected] ## @vercel/[email protected] ### Patch Changes - Update to latest Next.js adapter ([#15775](#15775)) Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

bundler updates

adccbc0

Fix Test Failures

b388285

vercel bot deployed to Preview March 23, 2026 20:42 View deployment

Changes

9b2086f

vercel bot deployed to Preview March 23, 2026 21:46 View deployment

Changeset

08ab13a

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Test FIxes

59667f7

vercel bot deployed to Preview March 24, 2026 04:15 View deployment

ShayCichocki marked this pull request as ready for review March 24, 2026 15:25

ShayCichocki requested a review from a team as a code owner March 24, 2026 15:25

ijjk reviewed Mar 24, 2026

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packages/node/src/serverless-functions/bundled-api-handler.mts Outdated Show resolved Hide resolved

handle: 'hit'added to build

7d6e20f

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ijjk reviewed Mar 24, 2026

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packages/node/test/unit/bundling.test.ts Show resolved Hide resolved

Add bundler e2e tests

02ee9a8

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ShayCichocki requested a review from ijjk March 29, 2026 21:54

ijjk reviewed Mar 30, 2026

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packages/node/src/bundling-handler.js Outdated Show resolved Hide resolved

ijjk reviewed Mar 30, 2026

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packages/node/src/bundling-handler.js Outdated Show resolved Hide resolved

Fix pr comments

895b898

vercel bot deployed to Preview March 31, 2026 18:42 View deployment

Merge branch 'main' into ci-bundler

fb42c90

vercel bot deployed to Preview April 1, 2026 00:44 View deployment

Merge branch 'main' into ci-bundler

9af41b0

vercel bot deployed to Preview April 1, 2026 14:42 View deployment

Continue to add bundling

539053e

vercel bot deployed to Preview April 1, 2026 16:07 View deployment

remove duplicated file

9624131

vercel bot deployed to Preview April 1, 2026 16:42 View deployment

Fix test fixture

23bea47

vercel bot deployed to Preview April 1, 2026 22:13 View deployment

ijjk reviewed Apr 1, 2026

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packages/node/src/bundling-handler.js Outdated Show resolved Hide resolved

ijjk reviewed Apr 1, 2026

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packages/node/src/build.ts Outdated Show resolved Hide resolved

ijjk reviewed Apr 1, 2026

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packages/node/src/bundling-handler.js Outdated Show resolved Hide resolved

Fixes

79280cb

vercel bot deployed to Preview April 1, 2026 22:46 View deployment

Add tests

5f4aa5d

vercel bot deployed to Preview April 1, 2026 22:48 View deployment

ShayCichocki requested a review from ijjk April 1, 2026 22:55

ijjk approved these changes Apr 1, 2026

View reviewed changes

ShayCichocki merged commit aa3ad22 into main Apr 2, 2026
179 checks passed

ShayCichocki deleted the ci-bundler branch April 2, 2026 14:45

vercel-cli-release-bot mentioned this pull request Apr 2, 2026

Version Packages #15809

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Add Bundling handler to vanilla node workflows#15691

Add Bundling handler to vanilla node workflows#15691
ShayCichocki merged 15 commits intomainfrom
ci-bundler

ShayCichocki commented Mar 23, 2026

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ShayCichocki commented Mar 23, 2026

Description

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🦋 Changeset detected

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📦 CLI Tarball Ready

Quick Test

Use in vercel.json

Python Runtime Wheel

Python Workers Wheel

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🧪 Unit Test Strategy

Results

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