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Turbopack: allow resolving TS files in tailwind config#90046

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mischnic merged 2 commits intocanaryfrom
mischnic/tailwind-tracing-ts
Mar 4, 2026
Merged

Turbopack: allow resolving TS files in tailwind config#90046
mischnic merged 2 commits intocanaryfrom
mischnic/tailwind-tracing-ts

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@mischnic mischnic commented Feb 16, 2026

A regression from #86576

Closes #87898
Closes PACK-6421

@nextjs-bot nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Feb 16, 2026
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codspeed-hq bot commented Feb 16, 2026

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks1


Comparing mischnic/tailwind-tracing-ts (83d76dc) with canary (4c379ca)

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Footnotes

  1. 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.

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nextjs-bot commented Feb 16, 2026

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 455ms ▁▁▃▁█
Cold (Ready in log) 437ms 439ms ▂▂▃▁█
Cold (First Request) 1.260s 1.263s ▄▄▄▁█
Warm (Listen) 456ms 456ms ▁▁▃▁█
Warm (Ready in log) 442ms 442ms ▁▁▃▁█
Warm (First Request) 353ms 352ms ▁▁▃▁█
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 456ms 455ms ▁▁▁▅▁
Cold (Ready in log) 438ms 438ms ▄▃▁▅▁
Cold (First Request) 1.923s 1.951s ▂▂▁▅▁
Warm (Listen) 456ms 456ms ▁▁▁▅▁
Warm (Ready in log) 438ms 438ms ▃▃▁▅▁
Warm (First Request) 1.966s 1.948s ▁▂▁▅▁

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 3.833s 3.790s ▁▁▆▁█
Cached Build 3.848s 3.769s ▁▁▅▁█
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.017s 13.972s ▁▁▁▄▁
Cached Build 14.140s 14.089s ▁▁▁▄▁
node_modules Size 476 MB 476 MB ▁▁▁▁▁
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **401 kB** → **401 kB** ✅ -30 B

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

Server

Middleware
Canary PR Change
middleware-b..fest.js gzip 770 B 762 B 🟢 8 B (-1%)
Total 770 B 762 B ✅ -8 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 450 B 452 B
Total 450 B 452 B ⚠️ +2 B

📦 Webpack

Client

Main Bundles
Canary PR Change
5528-HASH.js gzip 5.54 kB N/A -
6280-HASH.js gzip 58.8 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 254 B 253 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 59.5 kB -
Total 233 kB 233 kB ⚠️ +698 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 2.51 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 ✅ -1 B

Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 125 kB 125 kB
page.js gzip 254 kB 255 kB
Total 379 kB 380 kB ⚠️ +930 B
Middleware
Canary PR Change
middleware-b..fest.js gzip 617 B 616 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 45.2 kB 45.5 kB ⚠️ +328 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 4.06 MB 4.07 MB 🔴 +10.4 kB (+0%)
index.pack gzip 103 kB 103 kB
index.pack.old gzip 103 kB 102 kB
Total 4.26 MB 4.27 MB ⚠️ +10.4 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
app-page-exp...dev.js gzip 321 kB 321 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 317 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 49.3 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 70.5 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 62 kB
Total 2.83 MB 2.83 MB
📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/83d76dc5bab6575114acee20cfb937b475ba9c14/next

@mischnic mischnic marked this pull request as ready for review February 17, 2026 10:27
@mischnic mischnic requested a review from a team February 17, 2026 10:27
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nextjs-bot commented Feb 17, 2026

Tests Passed

@mischnic mischnic force-pushed the mischnic/tailwind-tracing-ts branch from 2d09527 to 3a86c1a Compare February 18, 2026 19:16
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Additional Suggestion:

Tailwind CSS test's config files use bare require('./my-plugin') and import './my-plugin' to import a .ts file, which fails in webpack mode because Node.js cannot resolve .ts extensions natively, causing next build to crash with exit code 1.

Fix on Vercel

Comment on lines +925 to +931
let mut extensions = vec![rcstr!(".js"), rcstr!(".node"), rcstr!(".json")];
if resolve_typescript {
extensions.insert(0, rcstr!(".ts"));
}

let resolve_options = ResolveOptionsContext {
enable_node_native_modules: true,
custom_extensions: Some(extensions),
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why disable node_native_modules?

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it's ignored anyway when providing custom_extensions

@mischnic mischnic force-pushed the mischnic/tailwind-tracing-ts branch from 3a86c1a to 83d76dc Compare March 4, 2026 13:48
@mischnic mischnic merged commit 5b17dfe into canary Mar 4, 2026
288 of 291 checks passed
@mischnic mischnic deleted the mischnic/tailwind-tracing-ts branch March 4, 2026 17:33
sokra pushed a commit that referenced this pull request Mar 6, 2026
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Tailwind config throws Module not found on Next.js 16.1.1 (works on 16.0)

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