[devtools] preload sourcemapped stackframes by eps1lon · Pull Request #90734 · vercel/next.js

eps1lon · 2026-03-01T19:20:05Z

...instead of kicking of the fetch in useEffect.

nextjs-bot · 2026-03-01T19:27:25Z

Failing test suites

Commit: f59ed9e | About building and testing Next.js

pnpm test-dev test/e2e/app-dir/log-file/log-file.test.ts (job)

log-file > should capture client logging in log file (DD)

Expand output

● log-file › should capture client logging in log file

expect(received).toMatchInlineSnapshot(snapshot)

Snapshot name: `log-file should capture client logging in log file 1`

- Snapshot  - 4
+ Received  + 4

- "{"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"LOG","message":"Client: Complex circular object: {\"data\":{\"nested\":{\"items\":[1,2,3],\"value\":42},\"parent\":\"[Circular]\"},\"metadata\":{\"name\":\"safe stringify\",\"version\":\"1.0.0\"},\"name\":\"test\"}"}
- {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"ERROR","message":"Client: This is an error message from client component"}
- {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"WARN","message":"Client: This is a warning message from client component"}
- {"timestamp":"xx:xx:xx.xxx","source":"Server","level":"ERROR","message":"[browser] \"Client: This is an error message from client component\" \"\\n    at ClientPage.useEffect (app/client/page.tsx:25:13)\\n  23 |     circularObj.data.parent = circularObj\\n  24 |     console.log('Client: Complex circular object:', circularObj)\\n> 25 |     console.error('Client: This is an error message from client component')\\n     |             ^\\n  26 |     console.warn('Client: This is a warning message from client component')\\n  27 |   }, [])\\n  28 |\" \"(app/client/page.tsx:25:13)\""}
+ "{"timestamp":"xx:xx:xx.xxx","source":"Server","level":"ERROR","message":"[browser] \"Client: This is an error message from client component\" \"\\n    at ClientPage.useEffect (app/client/page.tsx:25:13)\\n  23 |     circularObj.data.parent = circularObj\\n  24 |     console.log('Client: Complex circular object:', circularObj)\\n> 25 |     console.error('Client: This is an error message from client component')\\n     |             ^\\n  26 |     console.warn('Client: This is a warning message from client component')\\n  27 |   }, [])\\n  28 |\" \"(app/client/page.tsx:25:13)\""}
  {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"ERROR","message":"Client: This is an error message from client component \"\\n    at ClientPage.useEffect (app/client/page.tsx:25:13)\\n  23 |     circularObj.data.parent = circularObj\\n  24 |     console.log('Client: Complex circular object:', circularObj)\\n> 25 |     console.error('Client: This is an error message from client component')\\n     |             ^\\n  26 |     console.warn('Client: This is a warning message from client component')\\n  27 |   }, [])\\n  28 |\" \"(app/client/page.tsx:25:13)\""}
  {"timestamp":"xx:xx:xx.xxx","source":"Server","level":"WARN","message":"[browser] \"Client: This is a warning message from client component\" \"(app/client/page.tsx:26:13)\""}
+ {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"WARN","message":"Client: This is a warning message from client component"}
+ {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"LOG","message":"Client: Complex circular object: {\"data\":{\"nested\":{\"items\":[1,2,3],\"value\":42},\"parent\":\"[Circular]\"},\"metadata\":{\"name\":\"safe stringify\",\"version\":\"1.0.0\"},\"name\":\"test\"}"}
+ {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"ERROR","message":"Client: This is an error message from client component"}
  {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"WARN","message":"Client: This is a warning message from client component"}"

  136 |         const newLogContent = getNewLogContent()
  137 |         // Only browser only logs are being forwarded to terminal
> 138 |         expect(newLogContent).toMatchInlineSnapshot(`
      |                               ^
  139 |          "{"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"LOG","message":"Client: Complex circular object: {\\"data\\":{\\"nested\\":{\\"items\\":[1,2,3],\\"value\\":42},\\"parent\\":\\"[Circular]\\"},\\"metadata\\":{\\"name\\":\\"safe stringify\\",\\"version\\":\\"1.0.0\\"},\\"name\\":\\"test\\"}"}
  140 |          {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"ERROR","message":"Client: This is an error message from client component"}
  141 |          {"timestamp":"xx:xx:xx.xxx","source":"Browser","level":"WARN","message":"Client: This is a warning message from client component"}

  at toMatchInlineSnapshot (e2e/app-dir/log-file/log-file.test.ts:138:31)
  at fn (lib/next-test-utils.ts:845:20)
  at Object.<anonymous> (e2e/app-dir/log-file/log-file.test.ts:135:18)

pnpm test-start test/e2e/app-dir/with-babel/with-babel.test.ts (job)

with babel > should support babel in app dir (DD)
with babel > should contain og package files in middleware (DD)

Expand output

● with babel › should support babel in app dir

next build failed with code/signal 1

   97 |             if (code || signal)
   98 |               reject(
>  99 |                 new Error(
      |                 ^
  100 |                   `next build failed with code/signal ${code || signal}`
  101 |                 )
  102 |               )

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:99:17)

● with babel › should contain og package files in middleware

next build failed with code/signal 1

   97 |             if (code || signal)
   98 |               reject(
>  99 |                 new Error(
      |                 ^
  100 |                   `next build failed with code/signal ${code || signal}`
  101 |                 )
  102 |               )

  at ChildProcess.<anonymous> (lib/next-modes/next-start.ts:99:17)

pnpm test-dev test/e2e/react-compiler/react-compiler.test.ts (job)

react-compiler babelrc > should memoize Components (DD)
react-compiler babelrc > should name functions in dev (DD)
react-compiler babelrc > throws if the React Compiler is used in a React Server environment (DD)

Expand output

● react-compiler babelrc › should memoize Components

expect(received).toEqual(expected) // deep equality

Expected: 1
Received: undefined

  50 |       const browser = await next.browser('/')
  51 |
> 52 |       expect(await browser.eval('window.staticChildRenders')).toEqual(1)
     |                                                               ^
  53 |       expect(
  54 |         await browser.elementByCss('[data-testid="parent-commits"]').text()
  55 |       ).toEqual('Parent commits: 1')

  at Object.toEqual (e2e/react-compiler/react-compiler.test.ts:52:63)

● react-compiler babelrc › should name functions in dev

page.waitForSelector: Timeout 5000ms exceeded.
Call log:
  - waiting for locator('[data-testid="call-frame"][aria-busy="false"]') to be visible

  519 |
  520 |     return this.startChain(async () => {
> 521 |       const el = await page.waitForSelector(selector, {
      |                             ^
  522 |         timeout,
  523 |         state,
  524 |       })

  at waitForSelector (lib/browsers/playwright.ts:521:29)
  at Playwright._chain (lib/browsers/playwright.ts:651:23)
  at Playwright._chain [as startChain] (lib/browsers/playwright.ts:632:17)
  at Playwright.startChain [as waitForElementByCss] (lib/browsers/playwright.ts:520:17)
  at Object.waitForElementByCss (e2e/react-compiler/react-compiler.test.ts:85:21)

● react-compiler babelrc › throws if the React Compiler is used in a React Server environment

expect(received).toContain(expected) // indexOf

Expected substring: "⨯ TypeError: Cannot read properties of undefined (reading 'H')
    at Container (**)
  2 |"
Received string:    "⨯ ./node_modules/.pnpm/file+..+next-repo-32aa6cc41940be7644f481958076cfafea3db76c15f6408fa3da18441d7e58cf+packages+n_pfemd2gbskcysejhzmrrmowkbm/node_modules/next/dist/compiled/next-devtools/index.js
TypeError: e.charCodeAt is not a function
    at map
    at forEach
Import trace for requested module:
./node_modules/.pnpm/file+..+next-repo-32aa6cc41940be7644f481958076cfafea3db76c15f6408fa3da18441d7e58cf+packages+n_pfemd2gbskcysejhzmrrmowkbm/node_modules/next/dist/compiled/next-devtools/index.js
⨯ Error: ENOENT: no such file or directory, open '/tmp/next-install-c1b85b9832b3f44aa5b6ea9af1a23818899948a3022a3925263120979a077780/.next/dev/fallback-build-manifest.json'
    at ignore-listed
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/tmp/next-install-c1b85b9832b3f44aa5b6ea9af1a23818899948a3022a3925263120979a077780/.next/dev/fallback-build-manifest.json'
}
Error: ENOENT: no such file or directory, open '/tmp/next-install-c1b85b9832b3f44aa5b6ea9af1a23818899948a3022a3925263120979a077780/.next/dev/fallback-build-manifest.json'
    at ignore-listed
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/tmp/next-install-c1b85b9832b3f44aa5b6ea9af1a23818899948a3022a3925263120979a077780/.next/dev/fallback-build-manifest.json'
}
Error: ENOENT: no such file or directory, open '/tmp/next-install-c1b85b9832b3f44aa5b6ea9af1a23818899948a3022a3925263120979a077780/.next/dev/fallback-build-manifest.json'
    at ignore-listed
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/tmp/next-install-c1b85b9832b3f44aa5b6ea9af1a23818899948a3022a3925263120979a077780/.next/dev/fallback-build-manifest.json'
}
 GET /library-missing-react-server 500 in 2.9s
 GET /library-missing-react-server 500 in 2.9s
"

  135 |         // TODO(NDX-663): Unhelpful error message.
  136 |         // Should say that the library should have a react-server entrypoint that doesn't use the React Compiler.
> 137 |         expect(cliOutput).toContain(
      |                           ^
  138 |           "⨯ TypeError: Cannot read properties of undefined (reading 'H')" +
  139 |             // location not important. Just that this is the only frame.
  140 |             // TODO: Stack should start at product code. Possible React limitation.

  at Object.toContain (e2e/react-compiler/react-compiler.test.ts:137:27)

pnpm test test/integration/babel-next-image/babel-next-image.test.ts (job)

babel-next-image > should work with babel and next/image (DD)

Expand output

● babel-next-image › should work with babel and next/image

expect(received).toBe(expected) // Object.is equality

Expected: 200
Received: 500

  17 |     it('should work with babel and next/image', async () => {
  18 |       const res = await fetchViaHTTP(appPort, '/')
> 19 |       expect(res.status).toBe(200)
     |                          ^
  20 |     })
  21 |   }
  22 | )

  at Object.toBe (integration/babel-next-image/babel-next-image.test.ts:19:26)

pnpm test-start test/e2e/app-dir/next-after-app-static/build-time/build-time.test.ts (job)

after() in static pages > runs after during build (DD)

Expand output

● after() in static pages › runs after during build

can not run export while server is running, use next.stop() first

  251 |   ) {
  252 |     if (this.childProcess) {
> 253 |       throw new Error(
      |             ^
  254 |         `can not run export while server is running, use next.stop() first`
  255 |       )
  256 |     }

  at NextStartInstance.build (lib/next-modes/next-start.ts:253:13)
  at Object.build (e2e/app-dir/next-after-app-static/build-time/build-time.test.ts:36:36)

pnpm test-dev test/development/app-dir/server-components-hmr-cache/server-components-hmr-cache.test.ts (job)

server-components-hmr-cache > should support reading from an infinite streaming fetch (DD)

Expand output

● server-components-hmr-cache › should support reading from an infinite streaming fetch

thrown: "Exceeded timeout of 10000 ms for a test.
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."

  224 |   })
  225 |
> 226 |   it('should support reading from an infinite streaming fetch', async () => {
      |   ^
  227 |     const browser = await next.browser('/infinite-stream')
  228 |     const text = await browser.elementByCss('p').text()
  229 |     expect(text).toBe('data: chunk-1')

  at it (development/app-dir/server-components-hmr-cache/server-components-hmr-cache.test.ts:226:3)
  at Object.describe (development/app-dir/server-components-hmr-cache/server-components-hmr-cache.test.ts:6:1)

nextjs-bot · 2026-03-01T19:38:38Z

Stats from current PR

🟢 1 improvement

Metric	Canary	PR	Change	Trend
node_modules Size	476 MB	475 MB	🟢 693 kB (0%)	█████

📊 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)	559ms	559ms	✓	██▁▁▆
Cold (Ready in log)	524ms	522ms	✓	▆█▁▁▅
Cold (First Request)	1.137s	1.127s	✓	▅█▂▂▄
Warm (Listen)	558ms	558ms	✓	▇█▁▁▇
Warm (Ready in log)	517ms	518ms	✓	▆█▁▁▅
Warm (First Request)	408ms	398ms	✓	▆█▁▁▅

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	455ms	455ms	✓	█▁▁▁█
Cold (Ready in log)	438ms	438ms	✓	█▁▁▅▇
Cold (First Request)	1.921s	1.915s	✓	█▁▁▃▅
Warm (Listen)	456ms	455ms	✓	█▁▁▁█
Warm (Ready in log)	437ms	438ms	✓	█▁▁▄▇
Warm (First Request)	1.938s	1.914s	✓	█▁▁▃▆

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.957s	4.948s	✓	▄█▁▁▃
Cached Build	4.929s	4.963s	✓	▅█▁▁▃

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.012s	13.963s	✓	█▁▁▁▇
Cached Build	14.169s	14.126s	✓	█▁▁▁▇
node_modules Size	476 MB	475 MB	🟢 693 kB (0%)	█████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **401 kB** → **401 kB** ✅ -302 B

80 files with content-based hashes (individual files not comparable between builds)

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	768 B	766 B	✓
Total	768 B	766 B	✅ -2 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	451 B	450 B	✓
Total	451 B	450 B	✅ -1 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.54 kB	N/A	-
6280-HASH.js gzip	58.7 kB	N/A	-
6335.HASH.js gzip	169 B	N/A	-
912-HASH.js gzip	4.59 kB	N/A	-
e8aec2e4-HASH.js gzip	62.6 kB	N/A	-
framework-HASH.js gzip	59.7 kB	59.7 kB	✓
main-app-HASH.js gzip	256 B	254 B	✓
main-HASH.js gzip	39.1 kB	39.1 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	62.6 kB	-
9544-HASH.js gzip	N/A	59.1 kB	-
Total	232 kB	233 kB	⚠️ +412 B

Polyfills

	Canary	PR	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Total	39.4 kB	39.4 kB	✓

Pages

	Canary	PR	Change
_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	2.5 kB	2.5 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	7.97 kB	7.97 kB	✅ -2 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	125 kB	125 kB	✓
page.js gzip	255 kB	255 kB	✓
Total	380 kB	379 kB	✅ -333 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	616 B	614 B	✓
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	43.5 kB	43.9 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	45.1 kB	45.5 kB	⚠️ +394 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	4.05 MB	4.03 MB	🟢 19.4 kB (0%)
index.pack gzip	103 kB	103 kB	✓
index.pack.old gzip	103 kB	101 kB	🟢 2.17 kB (-2%)
Total	4.26 MB	4.24 MB	✅ -22 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	321 kB	320 kB	✓
app-page-exp..prod.js gzip	170 kB	170 kB	✓
app-page-tur...dev.js gzip	320 kB	320 kB	✓
app-page-tur..prod.js gzip	170 kB	170 kB	✓
app-page-tur...dev.js gzip	317 kB	316 kB	✓
app-page-tur..prod.js gzip	168 kB	168 kB	✓
app-page.run...dev.js gzip	317 kB	317 kB	✓
app-page.run..prod.js gzip	168 kB	168 kB	✓
app-route-ex...dev.js gzip	70.8 kB	70.8 kB	✓
app-route-ex..prod.js gzip	49.3 kB	49.2 kB	✓
app-route-tu...dev.js gzip	70.9 kB	70.9 kB	✓
app-route-tu..prod.js gzip	49.3 kB	49.3 kB	✓
app-route-tu...dev.js gzip	70.5 kB	70.4 kB	✓
app-route-tu..prod.js gzip	49 kB	49 kB	✓
app-route.ru...dev.js gzip	70.4 kB	70.4 kB	✓
app-route.ru..prod.js gzip	49 kB	49 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	43.2 kB	43.2 kB	✓
pages-api-tu..prod.js gzip	32.9 kB	32.9 kB	✓
pages-api.ru...dev.js gzip	43.2 kB	43.2 kB	✓
pages-api.ru..prod.js gzip	32.9 kB	32.9 kB	✓
pages-turbo....dev.js gzip	52.6 kB	52.6 kB	✓
pages-turbo...prod.js gzip	38.5 kB	38.5 kB	✓
pages.runtim...dev.js gzip	52.6 kB	52.6 kB	✓
pages.runtim..prod.js gzip	38.5 kB	38.5 kB	✓
server.runti..prod.js gzip	62 kB	61.9 kB	✓
Total	2.83 MB	2.82 MB	✅ -4.49 kB

📝 Changed Files (25 files)

Files with changes:

app-page-exp..ntime.dev.js
app-page-exp..time.prod.js
app-page-tur..ntime.dev.js
app-page-tur..time.prod.js
app-page-tur..ntime.dev.js
app-page-tur..time.prod.js
app-page.runtime.dev.js
app-page.runtime.prod.js
app-route-ex..ntime.dev.js
app-route-ex..time.prod.js
app-route-tu..ntime.dev.js
app-route-tu..time.prod.js
app-route-tu..ntime.dev.js
app-route-tu..time.prod.js
app-route.runtime.dev.js
app-route.ru..time.prod.js
pages-api-tu..ntime.dev.js
pages-api-tu..time.prod.js
pages-api.runtime.dev.js
pages-api.ru..time.prod.js
... and 5 more

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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/f59ed9ecfff0a008c8873c00b2e31f4510848655/next

Main motivation is getting to a versions supporting `enableNameAnonymousFunctions` option, which is needed to get proper function names in devtools builds. This option is only enabled for dev.

The previous method of using the PR endpoint under the hood calls the GitHub API to get the commit SHA, which is a waste of resources, so just use the commit SHA directly in the tarball URL.

…ts (#90722)

The fetch is kicked of earlier due to Activity. Next step is prerendering the next and previous error.

eps1lon · 2026-03-02T11:43:32Z

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nextjs-bot added created-by: Next.js team PRs by the Next.js team. type: next labels Mar 1, 2026

eps1lon and others added 9 commits March 2, 2026 12:42

[devtools] Bump React Compiler version to latest experimental

9e60c9b

Main motivation is getting to a versions supporting `enableNameAnonymousFunctions` option, which is needed to get proper function names in devtools builds. This option is only enabled for dev.

[devtools] Bundle for same target as Next.js browser runtime

0ee05b5

v16.2.0-canary.69

9f549f2

[devtools] Stop blocking overlay on error details copy (#90698)

0d2adec

Use commit-based tarball URL in PR stats comment (#90709)

835feeb

The previous method of using the PR endpoint under the hood calls the GitHub API to get the commit SHA, which is a waste of resources, so just use the commit SHA directly in the tarball URL.

[ci] Use commit instead of PR number for preview builds in deploy tes…

57c1037

…ts (#90722)

Remove unecessary microtask when getting original stack frames

36199d0

render-as-we-fetch (at home)

58a1f42

The fetch is kicked of earlier due to Activity. Next step is prerendering the next and previous error.

WIP test

f59ed9e

eps1lon changed the base branch from canary to graphite-base/90734 March 2, 2026 11:42

eps1lon force-pushed the sebbie/prefetch-sourcemapping branch from 29fb167 to f59ed9e Compare March 2, 2026 11:43

eps1lon force-pushed the graphite-base/90734 branch from 9c31bbd to 0ee05b5 Compare March 2, 2026 11:43

nextjs-bot added create-next-app Related to our CLI tool for quickly starting a new Next.js application. tests labels Mar 2, 2026

eps1lon changed the base branch from graphite-base/90734 to sebbie/03-02-_devtools_bundle_for_same_target_as_next.js_browser_runtime March 2, 2026 11:43

This was referenced Mar 2, 2026

[devtools] Bundle for same target as Next.js browser runtime #90762

Merged

[devtools] Bump React Compiler version to latest experimental #90763

Merged

eps1lon force-pushed the sebbie/03-02-_devtools_bundle_for_same_target_as_next.js_browser_runtime branch 3 times, most recently from 388064c to 09974ae Compare March 2, 2026 16:09

Base automatically changed from sebbie/03-02-_devtools_bundle_for_same_target_as_next.js_browser_runtime to canary March 3, 2026 17:05

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[devtools] preload sourcemapped stackframes#90734

[devtools] preload sourcemapped stackframes#90734
eps1lon wants to merge 9 commits intocanaryfrom
sebbie/prefetch-sourcemapping

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⚡ Dev Server

📦 Dev Server (Webpack)

⚡ Production Builds

📦 Production Builds (Webpack)

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📦 Webpack

🔄 Shared (bundler-independent)

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