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Turbopack: remove StarImportAnalyzer#92830

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Apr 15, 2026
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Turbopack: remove StarImportAnalyzer#92830
mischnic merged 2 commits into
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mischnic/remove-StarImportAnalyzer

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@mischnic mischnic commented Apr 15, 2026

There is actually no reason to compute full_star_imports before the visit_with(&mut analyzer): it's only used later on by references/mod.rs which calls should_import_all.
So we can just do it in the same traversal

@nextjs-bot nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Apr 15, 2026
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mischnic commented Apr 15, 2026

vercel[bot]

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codspeed-hq Bot commented Apr 15, 2026

Merging this PR will improve performance by 3.86%

⚡ 1 improved benchmark
✅ 16 untouched benchmarks
⏩ 3 skipped benchmarks1

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Simulation app-page-turbo.runtime.prod.js[full] 639.4 ms 615.6 ms +3.86%

Comparing mischnic/remove-StarImportAnalyzer (487822d) with canary (92b0789)

Open in CodSpeed

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 Apr 15, 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) 455ms 455ms █▁▁█▁
Cold (Ready in log) 443ms 445ms █▃█▁█
Cold (First Request) 1.140s 1.135s ▁█▁█▁
Warm (Listen) 456ms 457ms ▁▅▁▅▅
Warm (Ready in log) 444ms 444ms ▃▃▅▅▄
Warm (First Request) 349ms 346ms ▅▄█▄▇
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 455ms 456ms ▅▅▅▅▅
Cold (Ready in log) 437ms 437ms ▃▂▂▃▂
Cold (First Request) 1.946s 1.952s ▂▅▃▅▃
Warm (Listen) 456ms 455ms ▅▅█▁▅
Warm (Ready in log) 436ms 436ms ▃▂▂▃▁
Warm (First Request) 1.930s 1.972s ▁▅▃▅▄

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 3.928s 3.999s ▃▁▅▃▅
Cached Build 4.025s 3.914s ▃▁▅▁▅
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.408s 14.453s ▄▃▂▃▁
Cached Build 14.562s 14.577s ▂▃▁▃▂
node_modules Size 493 MB 493 MB █████
📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

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script-HASH.js gzip 386 B 386 B
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Server

Edge SSR
Canary PR Change
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page.js gzip 273 kB 273 kB
Total 399 kB 399 kB ✅ -348 B
Middleware
Canary PR Change
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middleware.js gzip 44 kB 44.3 kB
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Total 45.6 kB 45.9 kB ⚠️ +252 B
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Total 721 B 720 B ✅ -1 B
Build Cache
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index.pack gzip 114 kB 114 kB
index.pack.old gzip 113 kB 115 kB 🔴 +1.34 kB (+1%)
Total 4.61 MB 4.61 MB ✅ -325 B

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
app-page-exp...dev.js gzip 346 kB 346 kB
app-page-exp..prod.js gzip 192 kB 192 kB
app-page-tur...dev.js gzip 346 kB 346 kB
app-page-tur..prod.js gzip 192 kB 192 kB
app-page-tur...dev.js gzip 342 kB 342 kB
app-page-tur..prod.js gzip 190 kB 190 kB
app-page.run...dev.js gzip 343 kB 343 kB
app-page.run..prod.js gzip 190 kB 190 kB
app-route-ex...dev.js gzip 77 kB 77 kB
app-route-ex..prod.js gzip 52.5 kB 52.5 kB
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app-route-tu..prod.js gzip 52.6 kB 52.6 kB
app-route-tu...dev.js gzip 76.7 kB 76.7 kB
app-route-tu..prod.js gzip 52.3 kB 52.3 kB
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server.runti..prod.js gzip 62.9 kB 62.9 kB
Total 3.06 MB 3.06 MB ✅ -3 B
📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/487822d4d469184747e24b03ccde1cfd1816891f/next

@mischnic mischnic changed the base branch from mischnic/refactor-export-analysis to graphite-base/92830 April 15, 2026 16:22
@mischnic mischnic force-pushed the graphite-base/92830 branch from 3de5acb to de62a96 Compare April 15, 2026 16:23
@mischnic mischnic force-pushed the mischnic/remove-StarImportAnalyzer branch from 50ce3fd to 658ec6f Compare April 15, 2026 16:23
@graphite-app graphite-app Bot changed the base branch from graphite-base/92830 to canary April 15, 2026 16:23
@mischnic mischnic force-pushed the mischnic/remove-StarImportAnalyzer branch 2 times, most recently from c9bff2a to 14aab78 Compare April 15, 2026 16:24
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nextjs-bot commented Apr 15, 2026

Tests Passed

let callee_span = match &n.callee {
box Expr::Ident(Ident { sym, .. }) if sym == "Worker" => Some(n.span),
let callee_span = match &*n.callee {
Expr::Ident(Ident { sym, .. }) if sym == "Worker" => Some(n.span),
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this is a little weird right? should we check that this is an unresolved id as well? or i guess over matching is no big deal, but what about aliasing?

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@mischnic mischnic Apr 15, 2026

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this is the match on the parsing of the comment
and the actual JsValue-based logic will be a proper analysis.
but you're right, if you alias Worker to a different variable, then the comment wouldn't work.

@mischnic mischnic force-pushed the mischnic/remove-StarImportAnalyzer branch from 14aab78 to e489805 Compare April 15, 2026 18:43
@mischnic mischnic force-pushed the mischnic/remove-StarImportAnalyzer branch from e489805 to 487822d Compare April 15, 2026 18:52
@mischnic mischnic merged commit 45e5ad7 into canary Apr 15, 2026
494 of 499 checks passed
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@mischnic mischnic deleted the mischnic/remove-StarImportAnalyzer branch April 15, 2026 20:20
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