[turbopack] remove the _backend field from TaskGuardImpl

[lukesandberg]

Remove the field and corresponding generic type parameter. These are unused as of #88492

[lukesandberg]

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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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• [turbopack] remove the _backend field from TaskGuardImpl #89015 👈 (View in Graphite)
• Avoid using TaskTypes as keys in storage instead use hashes #88904
• Turbopack: refactor data storage to avoid reverse task cache #88492 : 1 other dependent PR (#88889 )
• Turbopack: add caching to chunking #88561
• Turbopack: use selective reads for merged modules #88560
• Turbopack: selective read for module_chunk_groups in ChunkGroupInfo #88559
• Turbopack: MappedReadRef should be Send and Sync #88558
• canary

This stack of pull requests is managed by Graphite. Learn more about stacking.

[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)	441ms	440ms	✓	▁▂▂▂▂
Cold (First Request)	1.165s	1.186s	✓	▁▃▃▃▃
Warm (Listen)	456ms	456ms	✓	▁▁▁▁▁
Warm (Ready in log)	443ms	444ms	✓	▁▁▁▁▁
Warm (First Request)	344ms	341ms	✓	▁▁▁▁▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	457ms	456ms	✓	▁▁█▁▁
Cold (Ready in log)	441ms	441ms	✓	▄▁█▃▃
Cold (First Request)	1.826s	1.831s	✓	▂▁█▂▂
Warm (Listen)	456ms	456ms	✓	▁▁█▁▁
Warm (Ready in log)	441ms	440ms	✓	▃▁█▃▃
Warm (First Request)	1.823s	1.833s	✓	▂▁█▂▂

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.343s	4.362s	✓	▁▁▁▁▁
Cached Build	4.312s	4.283s	✓	▁▁▁▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.105s	13.991s	✓	▁▁█▁▁
Cached Build	14.140s	14.196s	✓	▁▁█▁▁
node_modules Size	460 MB	460 MB	✓	█████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **432 kB** → **432 kB** ✅ -59 B

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

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	764 B	763 B	✓
Total	764 B	763 B	✅ -1 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	450 B	453 B	✓
Total	450 B	453 B	⚠️ +3 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
2086.HASH.js gzip	169 B	N/A	-
2161-HASH.js gzip	5.47 kB	N/A	-
2747-HASH.js gzip	4.53 kB	N/A	-
4322-HASH.js gzip	52.7 kB	N/A	-
ec793fe8-HASH.js gzip	62.3 kB	N/A	-
framework-HASH.js gzip	59.8 kB	59.8 kB	✓
main-app-HASH.js gzip	251 B	254 B	🔴 +3 B (+1%)
main-HASH.js gzip	38.7 kB	39.1 kB	✓
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
1596.HASH.js gzip	N/A	169 B	-
2658-HASH.js gzip	N/A	52.4 kB	-
6349-HASH.js gzip	N/A	4.52 kB	-
7019-HASH.js gzip	N/A	5.49 kB	-
b17a3386-HASH.js gzip	N/A	62.3 kB	-
Total	226 kB	226 kB	⚠️ +56 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	193 B	✓
_error-HASH.js gzip	182 B	182 B	✓
css-HASH.js gzip	336 B	335 B	✓
dynamic-HASH.js gzip	1.8 kB	1.8 kB	✓
edge-ssr-HASH.js gzip	256 B	256 B	✓
head-HASH.js gzip	352 B	349 B	✓
hooks-HASH.js gzip	385 B	384 B	✓
image-HASH.js gzip	580 B	580 B	✓
index-HASH.js gzip	259 B	258 B	✓
link-HASH.js gzip	2.5 kB	2.51 kB	✓
routerDirect..HASH.js gzip	319 B	317 B	✓
script-HASH.js gzip	385 B	387 B	✓
withRouter-HASH.js gzip	316 B	315 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.96 kB	✅ -8 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	126 kB	126 kB	✓
page.js gzip	244 kB	240 kB	🟢 4.72 kB (-2%)
Total	370 kB	366 kB	✅ -4.59 kB

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	617 B	617 B	✓
middleware-r..fest.js gzip	155 B	156 B	✓
middleware.js gzip	32.9 kB	33.3 kB	🔴 +392 B (+1%)
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	34.5 kB	34.9 kB	⚠️ +393 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	736 B	738 B	✓
Total	736 B	738 B	⚠️ +2 B

Build Cache

	Canary	PR	Change
0.pack gzip	3.71 MB	3.72 MB	🔴 +11.2 kB (+0%)
index.pack gzip	102 kB	103 kB	✓
index.pack.old gzip	102 kB	102 kB	✓
Total	3.92 MB	3.93 MB	⚠️ +12.2 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	306 kB	306 kB	✓
app-page-exp..prod.js gzip	163 kB	163 kB	✓
app-page-tur...dev.js gzip	306 kB	306 kB	✓
app-page-tur..prod.js gzip	163 kB	163 kB	✓
app-page-tur...dev.js gzip	302 kB	302 kB	✓
app-page-tur..prod.js gzip	161 kB	161 kB	✓
app-page.run...dev.js gzip	303 kB	303 kB	✓
app-page.run..prod.js gzip	161 kB	161 kB	✓
app-route-ex...dev.js gzip	69.4 kB	69.4 kB	✓
app-route-ex..prod.js gzip	48.2 kB	48.2 kB	✓
app-route-tu...dev.js gzip	69.4 kB	69.4 kB	✓
app-route-tu..prod.js gzip	48.2 kB	48.2 kB	✓
app-route-tu...dev.js gzip	69 kB	69 kB	✓
app-route-tu..prod.js gzip	47.9 kB	47.9 kB	✓
app-route.ru...dev.js gzip	68.9 kB	68.9 kB	✓
app-route.ru..prod.js gzip	47.9 kB	47.9 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	42.4 kB	42.4 kB	✓
pages-api-tu..prod.js gzip	32.2 kB	32.2 kB	✓
pages-api.ru...dev.js gzip	42.4 kB	42.4 kB	✓
pages-api.ru..prod.js gzip	32.2 kB	32.2 kB	✓
pages-turbo....dev.js gzip	51.7 kB	51.7 kB	✓
pages-turbo...prod.js gzip	38.8 kB	38.8 kB	✓
pages.runtim...dev.js gzip	51.7 kB	51.7 kB	✓
pages.runtim..prod.js gzip	38.8 kB	38.8 kB	✓
server.runti..prod.js gzip	62.4 kB	62.4 kB	✓
Total	2.73 MB	2.73 MB	✅ -54 B

📝 Changed Files (8 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

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app-page-exp..ntime.dev.js

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app-page-exp..time.prod.js

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app-page-tur..ntime.dev.js

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app-page-tur..time.prod.js

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app-page-tur..ntime.dev.js

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app-page-tur..time.prod.js

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app-page.runtime.dev.js

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app-page.runtime.prod.js

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[codspeed-hq]

Merging this PR will degrade performance by 6.82%

❌ 1 regressed benchmark
✅ 16 untouched benchmarks
⏩ 3 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	jsonwebtoken.js[tracing]	293.1 ms	314.5 ms	-6.82%

---

_{Comparing remove_backend_field (e3a2ff3) with direct_reverse_mapping (5ff9fe3)²}

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. ↩

2. No successful run was found on direct_reverse_mapping (f05430d) during the generation of this report, so bb3ad0c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩