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Improve root detection to handle worktrees, more workspaces & stray lockfiles - #96159

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Jul 28, 2026
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Improve root detection to handle worktrees, more workspaces & stray lockfiles#96159
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@sampoder sampoder commented Jul 24, 2026

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Watching too many files can hurt performance, and impacts how much work Turbopack is doing. See for example the conversation around #94597.

This PR handles the following four cases:

  • Git worktrees: we can include a guard to prevent exiting a worktree (by looking at the .git file).
  • Git repository boundaries: we can include a guard to prevent us from exiting a checked-out repository and watching the repository’s parent directory.
    • We will log a warning if this happens.
  • Empty / bogus package.lock files & package-lock.json files (and equivalents using other package managers): if we spot a package-lock.json file but it has no packages or a package-lock.json w/o an associated package.json file. We can ignore them. This handles the case of accidentally running npm install in any directory.
  • Home directory detection: we can detect if we’re going to start watching your home dir and rollback up if this is the case.
    • We will log a warning if this happens.
    • If your Next config is in your home dir, we will still run your app there as Next config is the furthest we can rollback
  • NPM, Yarn, Lerna & Bun workspaces: based on the workspaces field in the package.json or lerna.json

I would recommend using split-view to review. I also cleaned up the warnDuplicatedLockFiles() function because it was a bit unnecessary to repeat the full message.

Closes #92978

@sampoder
sampoder requested review from bgw, gaearon and lukesandberg July 24, 2026 19:06
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Stats from current PR

🔴 1 regression, 3 improvements

Metric Canary PR Change Trend
node_modules Size 550 MB 550 MB 🔴 +64.6 kB (+0%) █████
Webpack Build Time (cached) 24.221s 23.574s 🟢 647ms (-3%) ▁▄▁▂▁
Webpack Cold (First Request) 3.511s 3.246s 🟢 265ms (-8%) ▃▃▁▁▂
Webpack Warm (First Request) 3.460s 3.272s 🟢 188ms (-5%) ▂▃▁▁▁
📊 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 812ms ▁▂▂▂▂
Cold (Ready in log) 796ms 795ms ▁▁▂▂▁
Cold (First Request) 1.340s 1.350s ▁▁▃▂▂
Warm (Listen) 813ms 815ms ▁▂▂▂▂
Warm (Ready in log) 798ms 785ms ▁▁▂▁▁
Warm (First Request) 1.328s 1.288s ▂▁▃▂▁
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 812ms 759ms ▁▅▄▁▁
Cold (Ready in log) 794ms 752ms ▁▅▂▂▁
Cold (First Request) 3.511s 3.246s 🟢 265ms (-8%) ▃▃▁▁▂
Warm (Listen) 814ms 759ms ▁██▁█
Warm (Ready in log) 791ms 750ms ▁▄▂▂▄
Warm (First Request) 3.460s 3.272s 🟢 188ms (-5%) ▂▃▁▁▁

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 5.557s 5.491s ▁▁▃▂▂
Cached Build 5.747s 5.688s ▁▁▄▂▂
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 24.071s 24.053s ▃▅▂▃▄
Cached Build 24.221s 23.574s 🟢 647ms (-3%) ▁▄▁▂▁
node_modules Size 550 MB 550 MB 🔴 +64.6 kB (+0%) █████
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

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Server

Middleware
Canary PR Change
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Total 776 B 774 B ✅ -2 B
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Build Manifests
Canary PR Change
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Total 432 B 436 B ⚠️ +4 B

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Canary PR Change
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Total 240 kB 241 kB ⚠️ +663 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
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Server

Edge SSR
Canary PR Change
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page.js gzip 292 kB 293 kB
Total 421 kB 421 kB ⚠️ +302 B
Middleware
Canary PR Change
middleware-b..fest.js gzip 618 B 617 B
middleware-r..fest.js gzip 156 B 156 B
middleware.js gzip 45.8 kB 45.2 kB 🟢 547 B (-1%)
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Total 47.4 kB 46.9 kB ✅ -548 B
Build Details
Build Manifests
Canary PR Change
_buildManifest.js gzip 718 B 718 B
Total 718 B 718 B
Build Cache
Canary PR Change
0.pack gzip 4.82 MB 4.82 MB
index.pack gzip 122 kB 121 kB
index.pack.old gzip 123 kB 122 kB
Total 5.07 MB 5.06 MB ✅ -5 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
app-page-exp...dev.js gzip 372 kB 372 kB
app-page-exp..prod.js gzip 205 kB 205 kB
app-page-tur...dev.js gzip 371 kB 371 kB
app-page-tur..prod.js gzip 205 kB 205 kB
app-page-tur...dev.js gzip 368 kB 368 kB
app-page-tur..prod.js gzip 203 kB 203 kB
app-page.run...dev.js gzip 368 kB 368 kB
app-page.run..prod.js gzip 203 kB 203 kB
app-route-ex...dev.js gzip 82.5 kB 82.5 kB
app-route-ex..prod.js gzip 55.9 kB 55.9 kB
app-route-tu...dev.js gzip 82.5 kB 82.5 kB
app-route-tu..prod.js gzip 56 kB 56 kB
app-route-tu...dev.js gzip 82.1 kB 82.1 kB
app-route-tu..prod.js gzip 55.7 kB 55.7 kB
app-route.ru...dev.js gzip 82.1 kB 82.1 kB
app-route.ru..prod.js gzip 55.7 kB 55.7 kB
dev-validati...dev.js gzip 132 kB 132 kB
dev-validati...dev.js gzip 132 kB 132 kB
dev-validati...dev.js gzip 130 kB 130 kB
dev-validati...dev.js gzip 130 kB 130 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 45.5 kB 45.5 kB
pages-api-tu..prod.js gzip 34.1 kB 34.1 kB
pages-api.ru...dev.js gzip 45.5 kB 45.5 kB
pages-api.ru..prod.js gzip 34.1 kB 34.1 kB
pages-turbo....dev.js gzip 54.9 kB 54.9 kB
pages-turbo...prod.js gzip 39.8 kB 39.8 kB
pages.runtim...dev.js gzip 54.9 kB 54.9 kB
pages.runtim..prod.js gzip 39.8 kB 39.8 kB
server.runti..prod.js gzip 68.3 kB 68.3 kB
use-cache-pr...dev.js gzip 72 kB 72 kB
use-cache-pr...dev.js gzip 72 kB 72 kB
use-cache-pr...dev.js gzip 70.4 kB 70.4 kB
use-cache-pr...dev.js gzip 70.4 kB 70.4 kB
Total 4.08 MB 4.08 MB ✅ -6 B
📝 Changed Files (2 files)

Files with changes:

  • pages-api.runtime.dev.js
  • pages.runtime.dev.js
View diffs
pages-api.runtime.dev.js

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pages.runtime.dev.js

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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/983e03844bcf5f9f86c3241b464646f9696a2701/next

Commit: 983e038

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Tests Passed

Commit: 983e038

Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
@sampoder
sampoder force-pushed the sp/next/roots branch 2 times, most recently from 56befb6 to 6b8eb13 Compare July 27, 2026 21:31
@sampoder
sampoder requested a review from bgw July 27, 2026 21:35
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
Comment thread packages/next/src/lib/find-root.ts Outdated
@sampoder
sampoder force-pushed the sp/next/roots branch 2 times, most recently from 310ed7b to 9a84b05 Compare July 28, 2026 18:11
@sampoder
sampoder merged commit dcf4607 into canary Jul 28, 2026
127 checks passed
@sampoder
sampoder deleted the sp/next/roots branch July 28, 2026 20:35
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Turbopack: misdetected workspace root (from stray parent lockfile) causes RAM exhaustion (40+ GB) and infinite module-resolution retry on first request

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