Turbopack server hmr: Implement restart event

[wbinnssmith]

This implements the restart event, fully evicting all caches. This is needed for when client manifest changes are made.

Test Plan: CI for #90389

[nextjs-bot]

Tests Passed

[codspeed-hq]

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

---

_{Comparing server-hmr-default-implement-clear (fa65f1b) with canary (34647db)}

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. ↩

[nextjs-bot]

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)	438ms	438ms	✓	▂▁▁█▂
Cold (First Request)	1.256s	1.272s	✓	▄▁▁█▄
Warm (Listen)	457ms	456ms	✓	▁▁▁█▁
Warm (Ready in log)	444ms	446ms	✓	▁▁▁█▁
Warm (First Request)	346ms	345ms	✓	▁▁▁█▂

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	506ms	506ms	✓	▅▅▁▅▁
Cold (Ready in log)	481ms	480ms	✓	▁▂█▆▅
Cold (First Request)	2.109s	2.129s	✓	▁▂▆█▄
Warm (Listen)	506ms	507ms	✓	▃▃▃▃▁
Warm (Ready in log)	487ms	479ms	✓	▂▁▇▇▅
Warm (First Request)	2.138s	2.131s	✓	▂▁▄█▃

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.958s	3.970s	✓	▁▁▁█▁
Cached Build	4.022s	3.892s	✓	▁▁▁█▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	15.815s	15.930s	✓	▁▁▂█▂
Cached Build	15.965s	15.941s	✓	▁▂▃█▂
node_modules Size	475 MB	475 MB	✓	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **400 kB** → **400 kB** ✅ -13 B

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

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	764 B	764 B	✓
Total	764 B	764 B	✓

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	451 B	452 B	✓
Total	451 B	452 B	⚠️ +1 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.54 kB	N/A	-
6280-HASH.js gzip	58.3 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	255 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 kB	-
Total	232 kB	233 kB	⚠️ +720 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	254 kB	254 kB	✓
Total	379 kB	379 kB	⚠️ +317 B

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	616 B	612 B	✓
middleware-r..fest.js gzip	156 B	155 B	✓
middleware.js gzip	43.5 kB	44 kB	🔴 +455 B (+1%)
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	45.1 kB	45.6 kB	⚠️ +450 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	4.01 MB	4.02 MB	🔴 +5.12 kB (+0%)
index.pack gzip	103 kB	104 kB	✓
index.pack.old gzip	102 kB	103 kB	✓
Total	4.22 MB	4.23 MB	⚠️ +5.92 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	320 kB	320 kB	✓
app-page-exp..prod.js gzip	170 kB	170 kB	✓
app-page-tur...dev.js gzip	319 kB	319 kB	✓
app-page-tur..prod.js gzip	169 kB	169 kB	✓
app-page-tur...dev.js gzip	316 kB	316 kB	✓
app-page-tur..prod.js gzip	168 kB	168 kB	✓
app-page.run...dev.js gzip	316 kB	316 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	49.2 kB	49.2 kB	✓
app-route-tu...dev.js gzip	70.8 kB	70.8 kB	✓
app-route-tu..prod.js gzip	49.2 kB	49.2 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.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	32.8 kB	32.8 kB	✓
pages-turbo....dev.js gzip	52.5 kB	52.5 kB	✓
pages-turbo...prod.js gzip	38.5 kB	38.5 kB	✓
pages.runtim...dev.js gzip	52.5 kB	52.5 kB	✓
pages.runtim..prod.js gzip	38.4 kB	38.4 kB	✓
server.runti..prod.js gzip	62 kB	62 kB	✓
Total	2.82 MB	2.82 MB	⚠️ +1 B

📎 Tarball URL

next@https://vercel-packages.vercel.app/next/prs/90550/next

[wbinnssmith]

• [DO NOT MERGE] Enable server HMR by default for testing #90389
• Turbopack server HMR: inline source maps for evaled modules #90561
• Turbopack server hmr: Implement restart event #90550 👈 (View in Graphite)
• canary

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