Draft: Turbopack: Add downcasting logic for fs errors

[bgw]

This makes sure that we emit issues for filesystem errors at the top level, after applying the effects and collecting the errors.

[bgw]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• Draft: Turbopack: Add downcasting logic for fs errors #93712 👈 (View in Graphite)
• Draft: Turbopack: Add FsError type, return it from write/write_link effects #93711
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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)	812ms	811ms	✓	▁▅▅▃▅
Cold (Ready in log)	789ms	788ms	✓	▆█▂▁▄
Cold (First Request)	1.244s	1.249s	✓	▄▆▂▂▅
Warm (Listen)	811ms	811ms	✓	▁▆▆▃▃
Warm (Ready in log)	788ms	787ms	✓	▆█▂▂▄
Warm (First Request)	611ms	608ms	✓	▇█▂▃▅

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	811ms	809ms	✓	█████
Cold (Ready in log)	785ms	789ms	✓	▇▇███
Cold (First Request)	3.174s	3.207s	✓	▇▅▄██
Warm (Listen)	811ms	810ms	✓	█████
Warm (Ready in log)	787ms	786ms	✓	▇▆▇██
Warm (First Request)	3.161s	3.181s	✓	▅▃▃▇█

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.795s	4.794s	✓	█▆▁▁▆
Cached Build	4.761s	4.791s	✓	▆▅▁▄▅

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	23.914s	23.995s	✓	▅▆▅██
Cached Build	24.023s	24.001s	✓	▄▄▆▆█
node_modules Size	505 MB	505 MB	✓	▁▁▁██

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles

	Canary	PR	Change
0-_gc56kf9tfo.js gzip	154 B	N/A	-
047ad-p-61fjn.js gzip	156 B	N/A	-
04hm05ar7kldw.js gzip	5.73 kB	N/A	-
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0dvitrl5zg37g.js gzip	8.82 kB	N/A	-
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157abun3hwc_s.js gzip	10.3 kB	N/A	-
1bhal_i5byhy7.js gzip	162 B	N/A	-
1elt1qium-r2m.css gzip	115 B	115 B	✓
1jfwzy3ri2pyr.js gzip	154 B	N/A	-
1jj68jv9537mc.js gzip	13.8 kB	N/A	-
1jpaub6y8xlfr.js gzip	2.3 kB	N/A	-
1ot0mvscrc_uf.js gzip	233 B	N/A	-
2_m3xv2uq3sjc.js gzip	1.46 kB	N/A	-
224i1-g0lqvss.js gzip	49.5 kB	N/A	-
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28lrkt28g7fpx.js gzip	155 B	N/A	-
2c-fd4y1zozz8.js gzip	8.79 kB	N/A	-
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2extn3odmmem_.js gzip	12.9 kB	N/A	-
2fyhyy7niw9r6.js gzip	7.61 kB	N/A	-
2lyuhit6rn8fy.js gzip	9.44 kB	N/A	-
2q0gr8wfr3jwl.js gzip	8.77 kB	N/A	-
2qmtk0zius6fd.js gzip	157 B	N/A	-
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2uku_olcn15b7.js gzip	8.79 kB	N/A	-
30r8mm-46bdqy.js gzip	220 B	220 B	✓
3c03ks8ic59bl.js gzip	160 B	N/A	-
3c03yiy5ds-h6.js gzip	65.5 kB	N/A	-
3d0blqiuhma_c.js gzip	155 B	N/A	-
3inab2jybr4k9.js gzip	450 B	N/A	-
3jkm5tdjvaf_q.js gzip	13.1 kB	N/A	-
3mix8ikliw_bj.js gzip	169 B	N/A	-
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40pcd44z40i4a.js gzip	156 B	N/A	-
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turbopack-1m..-lpg.js gzip	4.18 kB	N/A	-
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turbopack-3s..rdjl.js gzip	4.2 kB	N/A	-
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0_i7nqgx23st7.js gzip	N/A	10 kB	-
05e40c15cx1dd.js gzip	N/A	7.61 kB	-
06puhytyxk31p.js gzip	N/A	8.82 kB	-
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23bz3xsg-5-1s.js gzip	N/A	8.71 kB	-
25m28ppgv1r-l.js gzip	N/A	156 B	-
27441mytv7pbm.js gzip	N/A	9.43 kB	-
2cjkwjgm1zcfs.js gzip	N/A	8.71 kB	-
2feeljlwn03ka.js gzip	N/A	156 B	-
2scd8zaoyb8md.js gzip	N/A	8.79 kB	-
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2zo2exm1d8qj1.js gzip	N/A	13.6 kB	-
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3g88fx8gbrpbb.js gzip	N/A	159 B	-
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3vb9z2m8f0e3l.js gzip	N/A	70.8 kB	-
40i505hu7da0e.js gzip	N/A	49.5 kB	-
41_yhm_31fcf8.js gzip	N/A	155 B	-
41mf-x3mmsxae.js gzip	N/A	12.9 kB	-
41ovqpfyyufzz.js gzip	N/A	168 B	-
43iwfqjnx1cy_.js gzip	N/A	8.78 kB	-
turbopack-0g..-9g6.js gzip	N/A	4.2 kB	-
turbopack-0u..nlgl.js gzip	N/A	4.18 kB	-
turbopack-1b..n71_.js gzip	N/A	4.2 kB	-
turbopack-1e..hu78.js gzip	N/A	4.2 kB	-
turbopack-1g..7-n-.js gzip	N/A	4.2 kB	-
turbopack-1l..qd49.js gzip	N/A	4.21 kB	-
turbopack-1t..oruv.js gzip	N/A	4.2 kB	-
turbopack-2q..tzzk.js gzip	N/A	4.2 kB	-
turbopack-2s..khje.js gzip	N/A	4.2 kB	-
turbopack-31..xepd.js gzip	N/A	4.2 kB	-
turbopack-3q..wh7s.js gzip	N/A	4.2 kB	-
turbopack-3t..pfdy.js gzip	N/A	4.2 kB	-
turbopack-3y..qhsx.js gzip	N/A	4.2 kB	-
turbopack-43..rc4q.js gzip	N/A	4.2 kB	-
Total	468 kB	468 kB	⚠️ +61 B

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	716 B	718 B	✓
Total	716 B	718 B	⚠️ +2 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	429 B	433 B	✓
Total	429 B	433 B	⚠️ +4 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
2258-HASH.js gzip	61.1 kB	N/A	-
2266-HASH.js gzip	4.69 kB	N/A	-
3317.HASH.js gzip	169 B	N/A	-
4866-HASH.js gzip	5.64 kB	N/A	-
9e302639-HASH.js gzip	62.7 kB	N/A	-
framework-HASH.js gzip	59.5 kB	59.5 kB	✓
main-app-HASH.js gzip	255 B	254 B	✓
main-HASH.js gzip	39.9 kB	39.9 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
175fd0fd-HASH.js gzip	N/A	62.7 kB	-
2596-HASH.js gzip	N/A	5.63 kB	-
34-HASH.js gzip	N/A	61 kB	-
5691.HASH.js gzip	N/A	169 B	-
9156-HASH.js gzip	N/A	4.68 kB	-
Total	236 kB	236 kB	✅ -87 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	193 B	193 B	✓
_error-HASH.js gzip	181 B	182 B	✓
css-HASH.js gzip	334 B	332 B	✓
dynamic-HASH.js gzip	1.79 kB	1.81 kB	✓
edge-ssr-HASH.js gzip	255 B	255 B	✓
head-HASH.js gzip	351 B	348 B	✓
hooks-HASH.js gzip	385 B	384 B	✓
image-HASH.js gzip	580 B	580 B	✓
index-HASH.js gzip	257 B	259 B	✓
link-HASH.js gzip	2.51 kB	2.52 kB	✓
routerDirect..HASH.js gzip	318 B	319 B	✓
script-HASH.js gzip	387 B	386 B	✓
withRouter-HASH.js gzip	316 B	316 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.99 kB	⚠️ +19 B

Server

Edge SSR

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edge-ssr.js gzip	126 kB	126 kB	✓
page.js gzip	275 kB	270 kB	🟢 5.26 kB (-2%)
Total	401 kB	396 kB	✅ -5.48 kB

Middleware

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middleware-b..fest.js gzip	617 B	615 B	✓
middleware-r..fest.js gzip	155 B	155 B	✓
middleware.js gzip	44.7 kB	44.5 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	46.3 kB	46.1 kB	✅ -185 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	719 B	717 B	✓
Total	719 B	717 B	✅ -2 B

Build Cache

	Canary	PR	Change
0.pack gzip	4.45 MB	4.45 MB	🟢 7.6 kB (0%)
index.pack gzip	115 kB	115 kB	✓
index.pack.old gzip	115 kB	116 kB	✓
Total	4.68 MB	4.68 MB	✅ -6.91 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	349 kB	349 kB	✓
app-page-exp..prod.js gzip	194 kB	194 kB	✓
app-page-tur...dev.js gzip	349 kB	349 kB	✓
app-page-tur..prod.js gzip	194 kB	194 kB	✓
app-page-tur...dev.js gzip	345 kB	345 kB	✓
app-page-tur..prod.js gzip	192 kB	192 kB	✓
app-page.run...dev.js gzip	346 kB	346 kB	✓
app-page.run..prod.js gzip	192 kB	192 kB	✓
app-route-ex...dev.js gzip	77.5 kB	77.5 kB	✓
app-route-ex..prod.js gzip	52.9 kB	52.9 kB	✓
app-route-tu...dev.js gzip	77.6 kB	77.6 kB	✓
app-route-tu..prod.js gzip	52.9 kB	52.9 kB	✓
app-route-tu...dev.js gzip	77.2 kB	77.2 kB	✓
app-route-tu..prod.js gzip	52.7 kB	52.7 kB	✓
app-route.ru...dev.js gzip	77.1 kB	77.1 kB	✓
app-route.ru..prod.js gzip	52.7 kB	52.7 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	44.3 kB	44.3 kB	✓
pages-api-tu..prod.js gzip	33.8 kB	33.8 kB	✓
pages-api.ru...dev.js gzip	44.3 kB	44.3 kB	✓
pages-api.ru..prod.js gzip	33.7 kB	33.7 kB	✓
pages-turbo....dev.js gzip	53.7 kB	53.7 kB	✓
pages-turbo...prod.js gzip	39.4 kB	39.4 kB	✓
pages.runtim...dev.js gzip	53.6 kB	53.6 kB	✓
pages.runtim..prod.js gzip	39.3 kB	39.3 kB	✓
server.runti..prod.js gzip	63.2 kB	63.2 kB	✓
use-cache-pr...dev.js gzip	69.7 kB	69.7 kB	✓
use-cache-pr...dev.js gzip	69.7 kB	69.7 kB	✓
use-cache-pr...dev.js gzip	68 kB	68 kB	✓
use-cache-pr...dev.js gzip	68 kB	68 kB	✓
Total	3.36 MB	3.36 MB	✓

📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/609e4cd19934f2bf1fb013942c1f870c90552559/next

Commit: 609e4cd

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