[DevServer] Add global lockfile for server discovery by gaojude · Pull Request #92033 · vercel/next.js

gaojude · 2026-03-28T05:50:37Z

There's currently no way for external tooling to discover all running next dev servers across different projects. Each server only acquires a per-project lockfile at <distDir>/lock.

This adds a global lockfile at ~/.next/dev/<port>/lock containing DevServerInfo JSON (pid, port, hostname, appUrl, startedAt). The lock is acquired via Lockfile.tryAcquire with unlockOnExit: true, so the OS releases the flock automatically on process exit including kill -9. Cleanup on graceful shutdown is handled via the existing onDevServerCleanup callback.

External tools can discover running servers by scanning ~/.next/dev/*/lock and attempting flock on each — a held lock means the server is alive, and the file contents provide connection details.

nextjs-bot · 2026-03-28T06:06:13Z

Failing test suites

Commit: f85e550 | About building and testing Next.js

pnpm test test/integration/next-image-new/app-dir/test/static.test.ts (job)

Static Image Component Tests > production mode > Should allow an image with a static src to omit height and width (DD)
Static Image Component Tests > production mode > Should use immutable cache-control header for static import (DD)
Static Image Component Tests > production mode > Should use immutable cache-control header even when unoptimized (DD)
Static Image Component Tests > production mode > should have containing followed by for priority image (DD)
Static Image Component Tests > production mode > Should automatically provide an image height and width (DD)
Static Image Component Tests > production mode > should use width and height prop to override import (DD)
Static Image Component Tests > production mode > should use height prop to adjust both width and height (DD)
Static Image Component Tests > production mode > should use width prop to adjust both width and height (DD)
Static Image Component Tests > production mode > should add a data URL placeholder to an image (DD)
Static Image Component Tests > production mode > should add a blur placeholder a statically imported jpg (DD)
Static Image Component Tests > production mode > should add a blur placeholder a statically imported png (DD)
Static Image Component Tests > production mode > should add a blur placeholder a statically imported png with fill (DD)
Static Image Component Tests > production mode > should add placeholder with blurDataURL and fill (DD)
Static Image Component Tests > production mode > should add placeholder even when blurDataURL aspect ratio does not match width/height ratio (DD)
Static Image Component Tests > production mode > should load direct imported image (DD)

Expand output

● Static Image Component Tests › production mode › Should allow an image with a static src to omit height and width

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › Should use immutable cache-control header for static import

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › Should use immutable cache-control header even when unoptimized

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should have containing followed by for priority image

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › Should automatically provide an image height and width

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should use width and height prop to override import

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should use height prop to adjust both width and height

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should use width prop to adjust both width and height

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should add a data URL placeholder to an image

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should add a blur placeholder a statically imported jpg

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should add a blur placeholder a statically imported png

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should add a blur placeholder a statically imported png with fill

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should add placeholder with blurDataURL and fill

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should add placeholder even when blurDataURL aspect ratio does not match width/height ratio

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

● Static Image Component Tests › production mode › should load direct imported image

thrown: "Exceeded timeout of 60000 ms for a hook.
Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."

  259 |     'production mode',
  260 |     () => {
> 261 |       beforeAll(async () => {
      |       ^
  262 |         await nextBuild(appDir)
  263 |         appPort = await findPort()
  264 |         app = await nextStart(appDir, appPort)

  at beforeAll (integration/next-image-new/app-dir/test/static.test.ts:261:7)
  at integration/next-image-new/app-dir/test/static.test.ts:258:56
  at Object.describe (integration/next-image-new/app-dir/test/static.test.ts:257:1)

pnpm test-start test/production/app-dir/metadata-static-route-cache/metadata-static-route-cache.test.ts (job)

app dir - metadata static routes cache > should generate different content after replace the static metadata file (DD)

Expand output

● app dir - metadata static routes cache › should generate different content after replace the static metadata file

next already started

  63 |   public async start(options: { skipBuild?: boolean } = {}) {
  64 |     if (this.childProcess) {
> 65 |       throw new Error('next already started')
     |             ^
  66 |     }
  67 |
  68 |     this._cliOutput = ''

  at NextStartInstance.start (lib/next-modes/next-start.ts:65:13)
  at Object.start (production/app-dir/metadata-static-route-cache/metadata-static-route-cache.test.ts:17:16)

nextjs-bot · 2026-03-28T06:13:22Z

Stats from current PR

✅ No significant changes detected

📊 All Metrics

📖 Metrics Glossary

Dev Server Metrics:

Listen = TCP port starts accepting connections
First Request = HTTP server returns successful response
Cold = Fresh build (no cache)
Warm = With cached build artifacts

Build Metrics:

Fresh = Clean build (no .next directory)
Cached = With existing .next directory

Change Thresholds:

Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
Size: Changes < 1KB AND < 1% are insignificant
All other changes are flagged to catch regressions

⚡ Dev Server

Metric	Canary	PR	Change	Trend
Cold (Listen)	455ms	455ms	✓	█▁▁▁▁
Cold (Ready in log)	439ms	439ms	✓	█▁▁▁▁
Cold (First Request)	1.115s	1.134s	✓	█▂▂▂▂
Warm (Listen)	456ms	456ms	✓	█▁▁▁▁
Warm (Ready in log)	444ms	443ms	✓	█▁▁▁▁
Warm (First Request)	344ms	344ms	✓	█▁▁▁▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	455ms	455ms	✓	█▁▁▁▁
Cold (Ready in log)	437ms	438ms	✓	█▁▁▁▁
Cold (First Request)	1.946s	1.936s	✓	█▁▃▃▁
Warm (Listen)	456ms	456ms	✓	█▁▁▁▁
Warm (Ready in log)	438ms	438ms	✓	█▁▁▁▁
Warm (First Request)	1.962s	1.959s	✓	█▁▃▃▁

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.873s	3.891s	✓	█▁▁▁▁
Cached Build	3.872s	3.906s	✓	█▁▁▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.465s	14.439s	✓	█▁▁▂▁
Cached Build	14.565s	14.563s	✓	█▁▁▁▁
node_modules Size	485 MB	485 MB	✓	█████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

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turbopack-28..y___.js gzip	N/A	4.16 kB	-
turbopack-2p..jy4_.js gzip	N/A	4.17 kB	-
turbopack-2r..u-us.js gzip	N/A	4.16 kB	-
turbopack-36..lzmc.js gzip	N/A	4.16 kB	-
turbopack-3a..9uds.js gzip	N/A	4.16 kB	-
turbopack-3v..ajfh.js gzip	N/A	4.16 kB	-
Total	464 kB	464 kB	✅ -8 B

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	720 B	714 B	✓
Total	720 B	714 B	✅ -6 B

Build Details

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	Canary	PR	Change
_buildManifest.js gzip	431 B	434 B	✓
Total	431 B	434 B	⚠️ +3 B

📦 Webpack

Client

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	Canary	PR	Change
5528-HASH.js gzip	5.54 kB	N/A	-
6280-HASH.js gzip	60.7 kB	N/A	-
6335.HASH.js gzip	169 B	N/A	-
912-HASH.js gzip	4.59 kB	N/A	-
e8aec2e4-HASH.js gzip	62.8 kB	N/A	-
framework-HASH.js gzip	59.7 kB	59.7 kB	✓
main-app-HASH.js gzip	255 B	253 B	✓
main-HASH.js gzip	39.3 kB	39.2 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
262-HASH.js gzip	N/A	4.59 kB	-
2889.HASH.js gzip	N/A	169 B	-
5602-HASH.js gzip	N/A	5.55 kB	-
6948ada0-HASH.js gzip	N/A	62.8 kB	-
9544-HASH.js gzip	N/A	61.4 kB	-
Total	235 kB	235 kB	⚠️ +664 B

Polyfills

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polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Total	39.4 kB	39.4 kB	✓

Pages

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_app-HASH.js gzip	194 B	194 B	✓
_error-HASH.js gzip	183 B	180 B	🟢 3 B (-2%)
css-HASH.js gzip	331 B	330 B	✓
dynamic-HASH.js gzip	1.81 kB	1.81 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	351 B	352 B	✓
hooks-HASH.js gzip	384 B	383 B	✓
image-HASH.js gzip	580 B	581 B	✓
index-HASH.js gzip	260 B	260 B	✓
link-HASH.js gzip	2.51 kB	2.51 kB	✓
routerDirect..HASH.js gzip	320 B	319 B	✓
script-HASH.js gzip	386 B	386 B	✓
withRouter-HASH.js gzip	315 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.98 kB	7.98 kB	✅ -3 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	125 kB	125 kB	✓
page.js gzip	270 kB	270 kB	✓
Total	395 kB	396 kB	⚠️ +228 B

Middleware

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middleware-b..fest.js gzip	621 B	613 B	🟢 8 B (-1%)
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	43.9 kB	44 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	45.6 kB	45.6 kB	⚠️ +70 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	715 B	718 B	✓
Total	715 B	718 B	⚠️ +3 B

Build Cache

	Canary	PR	Change
0.pack gzip	4.35 MB	4.34 MB	🟢 5.66 kB (0%)
index.pack gzip	111 kB	110 kB	✓
index.pack.old gzip	110 kB	110 kB	✓
Total	4.57 MB	4.56 MB	✅ -6.75 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	335 kB	335 kB	✓
app-page-exp..prod.js gzip	185 kB	185 kB	✓
app-page-tur...dev.js gzip	335 kB	335 kB	✓
app-page-tur..prod.js gzip	185 kB	185 kB	✓
app-page-tur...dev.js gzip	331 kB	331 kB	✓
app-page-tur..prod.js gzip	183 kB	183 kB	✓
app-page.run...dev.js gzip	332 kB	332 kB	✓
app-page.run..prod.js gzip	184 kB	184 kB	✓
app-route-ex...dev.js gzip	76.2 kB	76.2 kB	✓
app-route-ex..prod.js gzip	51.9 kB	51.9 kB	✓
app-route-tu...dev.js gzip	76.3 kB	76.3 kB	✓
app-route-tu..prod.js gzip	51.9 kB	51.9 kB	✓
app-route-tu...dev.js gzip	75.9 kB	75.9 kB	✓
app-route-tu..prod.js gzip	51.6 kB	51.6 kB	✓
app-route.ru...dev.js gzip	75.8 kB	75.8 kB	✓
app-route.ru..prod.js gzip	51.6 kB	51.6 kB	✓
dist_client_...dev.js gzip	324 B	324 B	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
dist_client_...dev.js gzip	317 B	317 B	✓
pages-api-tu...dev.js gzip	43.5 kB	43.5 kB	✓
pages-api-tu..prod.js gzip	33.1 kB	33.1 kB	✓
pages-api.ru...dev.js gzip	43.4 kB	43.4 kB	✓
pages-api.ru..prod.js gzip	33.1 kB	33.1 kB	✓
pages-turbo....dev.js gzip	52.9 kB	52.9 kB	✓
pages-turbo...prod.js gzip	38.7 kB	38.7 kB	✓
pages.runtim...dev.js gzip	52.8 kB	52.8 kB	✓
pages.runtim..prod.js gzip	38.7 kB	38.7 kB	✓
server.runti..prod.js gzip	62.5 kB	62.5 kB	✓
Total	2.98 MB	2.98 MB	✅ -3 B

📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/f85e550b3bc62bdffa6d843df62ea0da745fb2a0/next

[DevServer] Add global lockfile for server discovery

9d1572d

nextjs-bot added created-by: Next.js team PRs by the Next.js team. type: next labels Mar 28, 2026

gaojude requested a review from bgw March 28, 2026 05:51

Add e2e test for global lockfile server discovery

f85e550

nextjs-bot added the tests label Mar 28, 2026

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[DevServer] Add global lockfile for server discovery#92033

[DevServer] Add global lockfile for server discovery#92033
gaojude wants to merge 2 commits intocanaryfrom
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nextjs-bot commented Mar 28, 2026 •

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