Turbopack: Move PrettyPrintError to turbo_tasks and add tests #89280

sokra · 2026-01-30T08:23:06Z

What?

Move the error printing logic to turbo_tasks and add test cases for it

sokra · 2026-01-30T08:23:26Z

fixup! add test case for error display #89293
Turbopack: Move PrettyPrintError to turbo_tasks and add tests #89280 👈 (View in Graphite)
Turbopack: improve print_cache_item_size #89279
canary

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nextjs-bot · 2026-01-30T08:49:27Z

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)	456ms	456ms	✓	▁▁█▁▁
Cold (Ready in log)	444ms	444ms	✓	▁▂█▁▂
Cold (First Request)	813ms	820ms	✓	▁▂█▁▅
Warm (Listen)	456ms	456ms	✓	▁▁█▁▁
Warm (Ready in log)	441ms	443ms	✓	▁▁█▁▁
Warm (First Request)	347ms	350ms	✓	▁▂█▂▂

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	456ms	456ms	✓	██▁█▁
Cold (Ready in log)	437ms	438ms	✓	█▆▆▇▅
Cold (First Request)	1.751s	1.743s	✓	▄▄▃▅▃
Warm (Listen)	456ms	456ms	✓	▅▁▅▅█
Warm (Ready in log)	437ms	438ms	✓	▆▅▄▅▄
Warm (First Request)	1.742s	1.755s	✓	▄▄▃▅▃

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.024s	3.976s	✓	▁▃█▂▁
Cached Build	4.024s	4.000s	✓	▁▃█▂▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.691s	13.716s	✓	▁▂▁▄▂
Cached Build	13.829s	13.786s	✓	▂▂▁▄▁
node_modules Size	464 MB	464 MB	✓	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **434 kB** → **434 kB** ✅ -11 B

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

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	763 B	770 B	✓
Total	763 B	770 B	⚠️ +7 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	5.47 kB	N/A	-
6280-HASH.js gzip	54.5 kB	N/A	-
6335.HASH.js gzip	169 B	N/A	-
912-HASH.js gzip	4.53 kB	N/A	-
e8aec2e4-HASH.js gzip	62.5 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 kB	39 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
262-HASH.js gzip	N/A	4.52 kB	-
2889.HASH.js gzip	N/A	169 B	-
5602-HASH.js gzip	N/A	5.48 kB	-
6948ada0-HASH.js gzip	N/A	62.5 kB	-
9544-HASH.js gzip	N/A	55.2 kB	-
Total	228 kB	228 kB	⚠️ +671 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	2.49 kB	2.49 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	✅ -1 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	126 kB	126 kB	✓
page.js gzip	248 kB	249 kB	✓
Total	375 kB	375 kB	⚠️ +135 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	617 B	614 B	✓
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	33 kB	33.2 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.6 kB	34.8 kB	⚠️ +196 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	732 B	736 B	✓
Total	732 B	736 B	⚠️ +4 B

Build Cache

	Canary	PR	Change
0.pack gzip	3.8 MB	3.81 MB	🔴 +12.2 kB (+0%)
index.pack gzip	104 kB	102 kB	🟢 1.76 kB (-2%)
index.pack.old gzip	102 kB	102 kB	✓
Total	4 MB	4.01 MB	⚠️ +11.3 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	311 kB	311 kB	✓
app-page-exp..prod.js gzip	166 kB	166 kB	✓
app-page-tur...dev.js gzip	311 kB	311 kB	✓
app-page-tur..prod.js gzip	166 kB	166 kB	✓
app-page-tur...dev.js gzip	308 kB	308 kB	✓
app-page-tur..prod.js gzip	164 kB	164 kB	✓
app-page.run...dev.js gzip	308 kB	308 kB	✓
app-page.run..prod.js gzip	164 kB	164 kB	✓
app-route-ex...dev.js gzip	70.4 kB	70.4 kB	✓
app-route-ex..prod.js gzip	48.9 kB	48.9 kB	✓
app-route-tu...dev.js gzip	70.4 kB	70.4 kB	✓
app-route-tu..prod.js gzip	49 kB	49 kB	✓
app-route-tu...dev.js gzip	70 kB	70 kB	✓
app-route-tu..prod.js gzip	48.7 kB	48.7 kB	✓
app-route.ru...dev.js gzip	70 kB	70 kB	✓
app-route.ru..prod.js gzip	48.7 kB	48.7 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	43.1 kB	43.1 kB	✓
pages-api-tu..prod.js gzip	32.9 kB	32.9 kB	✓
pages-api.ru...dev.js gzip	43.1 kB	43.1 kB	✓
pages-api.ru..prod.js gzip	32.8 kB	32.8 kB	✓
pages-turbo....dev.js gzip	52.4 kB	52.4 kB	✓
pages-turbo...prod.js gzip	39.4 kB	39.4 kB	✓
pages.runtim...dev.js gzip	52.4 kB	52.4 kB	✓
pages.runtim..prod.js gzip	39.3 kB	39.3 kB	✓
server.runti..prod.js gzip	62.5 kB	62.5 kB	✓
Total	2.77 MB	2.77 MB	⚠️ +3 B

codspeed-hq · 2026-01-30T08:49:29Z

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing sokra/pretty-print-error (e8f6a23) with canary (ef6ac79)}

Summary

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

3 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

turbopack/crates/turbo-tasks-backend/tests/test_config.trs

nextjs-bot · 2026-01-30T18:20:31Z

Failing test suites

Commit: e8f6a23 | About building and testing Next.js

pnpm test-dev-turbo test/development/mcp-server/mcp-server-get-logs.test.ts (turbopack) (job)

Expand output

● Test suite failed to run

Jest encountered an unexpected token

Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.

By default "node_modules" folder is ignored by transformers.

Here's what you can do:
 • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
 • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
 • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
 • If you need a custom transformation specify a "transform" option in your config.
 • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

You'll find more details and examples of these config options in the docs:
https://jestjs.io/docs/configuration
For information about custom transformations, see:
https://jestjs.io/docs/code-transformation

Details:

/root/actions-runner/_work/next.js/next.js/test/development/mcp-server/mcp-server-get-logs.test.ts:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){import path from 'path';
                                                                                  ^^^^^^

SyntaxError: Cannot use import statement outside a module

  at Runtime.createScriptFromCode (../node_modules/.pnpm/jest-runtime@29.7.0/node_modules/jest-runtime/build/index.js:1505:14)

pnpm test-start-turbo test/e2e/app-dir/segment-cache/revalidation/segment-cache-revalidation.test.ts (turbopack) (job)

segment cache (revalidation) > re-fetch visible links after a navigation, if needed (DD)

Expand output

● segment cache (revalidation) › re-fetch visible links after a navigation, if needed

thrown: "Exceeded timeout of 120000 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."

  248 |   })
  249 |
> 250 |   it('re-fetch visible links after a navigation, if needed', async () => {
      |   ^
  251 |     let act: ReturnType<typeof createRouterAct>
  252 |     const browser = await next.browser('/refetch-on-new-base-tree/a', {
  253 |       beforePageLoad(page) {

  at it (e2e/app-dir/segment-cache/revalidation/segment-cache-revalidation.test.ts:250:3)
  at Object.describe (e2e/app-dir/segment-cache/revalidation/segment-cache-revalidation.test.ts:7:1)

pnpm test-start test/e2e/app-dir/segment-cache/prefetch-runtime/prefetch-runtime.test.ts (job)

runtime prefetching > in a private cache > can completely prefetch a page that uses cookies and no uncached IO (DD)

Expand output

● runtime prefetching › in a private cache › can completely prefetch a page that uses cookies and no uncached IO

apiRequestContext.fetch: socket hang up
Call log:
  - → GET http://localhost:41111/in-private-cache/cookies-only?_rsc=180y0
  -   user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/130.0.6723.31 Safari/537.36
  -   accept: */*
  -   accept-encoding: gzip,deflate,br
  -   cookie: testCookie=initialValue
  -   next-test-fetch-priority: low
  -   referer: http://localhost:41111/
  -   next-router-prefetch: 1
  -   next-router-segment-prefetch: /!KGRlZmF1bHQp/in-private-cache
  -   next-url: /
  -   rsc: 1
  -   sec-ch-ua: "Chromium";v="130", "HeadlessChrome";v="130", "Not?A_Brand";v="99"
  -   sec-ch-ua-mobile: ?0
  -   sec-ch-ua-platform: "Linux"

  225 |             // server; we pass the request to the server the immediately.
  226 |             result: (async () => {
> 227 |               const originalResponse = await page.request.fetch(request, {
      |                                                           ^
  228 |                 maxRedirects: 0,
  229 |               })
  230 |

  at fetch (lib/router-act.ts:227:59)
  at lib/router-act.ts:245:13
  at routeHandler (lib/router-act.ts:257:7)

● runtime prefetching › in a private cache › can completely prefetch a page that uses cookies and no uncached IO

apiRequestContext.fetch: socket hang up
Call log:
  - → GET http://localhost:41111/in-private-cache/cookies-only?_rsc=180y0
  -   user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/130.0.6723.31 Safari/537.36
  -   accept: */*
  -   accept-encoding: gzip,deflate,br
  -   cookie: testCookie=initialValue
  -   next-test-fetch-priority: low
  -   referer: http://localhost:41111/
  -   next-router-prefetch: 1
  -   next-router-segment-prefetch: /!KGRlZmF1bHQp/in-private-cache
  -   next-url: /
  -   rsc: 1
  -   sec-ch-ua: "Chromium";v="130", "HeadlessChrome";v="130", "Not?A_Brand";v="99"
  -   sec-ch-ua-mobile: ?0
  -   sec-ch-ua-platform: "Linux"

  225 |             // server; we pass the request to the server the immediately.
  226 |             result: (async () => {
> 227 |               const originalResponse = await page.request.fetch(request, {
      |                                                           ^
  228 |                 maxRedirects: 0,
  229 |               })
  230 |

  at fetch (lib/router-act.ts:227:59)
  at lib/router-act.ts:245:13
  at routeHandler (lib/router-act.ts:257:7)

graphite-app · 2026-01-31T00:30:28Z

Merge activity

Jan 31, 12:30 AM UTC: Graphite rebased this pull request, because this pull request is set to merge when ready.

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Jan 30, 2026

sokra mentioned this pull request Jan 30, 2026

Turbopack: improve print_cache_item_size #89279

Merged

sokra changed the title ~~Move PrettyPrintError to turbo_tasks~~ Jan 30, 2026

sokra changed the title ~~Move PrettyPrintError to turbo_tasks and add test~~ Jan 30, 2026

sokra marked this pull request as ready for review January 30, 2026 08:27

sokra requested a review from mischnic January 30, 2026 08:28

mischnic approved these changes Jan 30, 2026

View reviewed changes

sokra force-pushed the sokra/task-cache-stats-details branch from 2b58d7e to a3bdc37 Compare January 30, 2026 13:30

sokra force-pushed the sokra/pretty-print-error branch 2 times, most recently from 50f8e9f to 5f0df7a Compare January 30, 2026 14:50

sokra mentioned this pull request Jan 30, 2026

fixup! add test case for error display #89293

Draft

sokra force-pushed the sokra/task-cache-stats-details branch from a3bdc37 to 67c30f9 Compare January 30, 2026 15:26

sokra force-pushed the sokra/pretty-print-error branch from 5f0df7a to 1332f0e Compare January 30, 2026 15:26

mischnic reviewed Jan 30, 2026

View reviewed changes

turbopack/crates/turbo-tasks-backend/tests/test_config.trs Outdated Show resolved Hide resolved

sokra changed the base branch from sokra/task-cache-stats-details to graphite-base/89280 January 30, 2026 17:58

sokra force-pushed the graphite-base/89280 branch from 67c30f9 to f7e3314 Compare January 30, 2026 17:59

sokra force-pushed the sokra/pretty-print-error branch from de64265 to 07a5442 Compare January 30, 2026 17:59

graphite-app bot changed the base branch from graphite-base/89280 to canary January 30, 2026 17:59

sokra force-pushed the sokra/pretty-print-error branch from 07a5442 to 062bfa0 Compare January 30, 2026 17:59

sokra added 3 commits January 31, 2026 00:29

Move PrettyPrintError to turbo_tasks

3c3d144

add test case for error display

ea467e6

Update test_config.trs

e8f6a23

sokra force-pushed the sokra/pretty-print-error branch from 062bfa0 to e8f6a23 Compare January 31, 2026 00:29

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Turbopack: Move PrettyPrintError to turbo_tasks and add tests #89280

Turbopack: Move PrettyPrintError to turbo_tasks and add tests #89280

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Turbopack: Move PrettyPrintError to turbo_tasks and add tests #89280

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Stats from current PR

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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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CodSpeed Performance Report

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Failing test suites

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