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Turbopack: improve Pat::Assign modelling in analyzer - #97867

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sokra merged 2 commits into
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mischnic/improve-pat-assign-modelling
Aug 26, 2026
Merged

Turbopack: improve Pat::Assign modelling in analyzer#97867
sokra merged 2 commits into
canaryfrom
mischnic/improve-pat-assign-modelling

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@mischnic

@mischnic mischnic commented Aug 25, 2026

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The value of the argument is actually Argument | Default value. Previously, the take_pat_value would take it and the recursive visit_pat would not see it anymore.

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Tests Passed

Commit: 3e9b109

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Stats from current PR

🔴 3 regressions

Metric Canary PR Change Trend
Webpack Build Time 23.640s 25.684s 🔴 +2.044s (+9%) █▂█▁▁
Webpack Build Time (cached) 24.479s 25.521s 🔴 +1.042s (+4%) █▂█▁▁
Webpack Cold (First Request) 3.279s 3.467s 🔴 +188ms (+6%) █▁▇▁▁
📊 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 861ms █████
Cold (Ready in log) 792ms 820ms ▇█▆▅▅
Cold (First Request) 1.255s 1.303s ▇█▆▄▃
Warm (Listen) 812ms 812ms █████
Warm (Ready in log) 791ms 791ms ▅▆▅▃▄
Warm (First Request) 1.246s 1.249s ▅▇▆▂▃
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 812ms 814ms █▁█▁▁
Cold (Ready in log) 783ms 823ms █▂█▁▁
Cold (First Request) 3.279s 3.467s 🔴 +188ms (+6%) █▁▇▁▁
Warm (Listen) 814ms 814ms █▁▇▁▁
Warm (Ready in log) 804ms 806ms █▁█▁▁
Warm (First Request) 3.450s 3.432s █▁▇▁▁

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 5.695s 5.724s █▇▇▇▇
Cached Build 2.873s 2.900s ██▆▅▂
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 23.640s 25.684s 🔴 +2.044s (+9%) █▂█▁▁
Cached Build 24.479s 25.521s 🔴 +1.042s (+4%) █▂█▁▁
node_modules Size 553 MB 553 MB ▁▁▁▁▁
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Server

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🔄 Shared (bundler-independent)

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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/3e9b109030486b11ff224a6ed1f4e8147fe984f6/next

Commit: 3e9b109

@mischnic mischnic changed the title improve Pat::Assign modelling Turbopack: improve Pat::Assign modelling in analyzer Aug 25, 2026
@mischnic
mischnic requested a review from a team August 25, 2026 12:34
@mischnic
mischnic marked this pull request as ready for review August 25, 2026 12:34
self.arena,
self.eval_context.eval(self.arena, &assign.right),
);
self.with_pat_value(Some(value), |this| {

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let mut ast_path =
                ast_path.with_guard(AstParentNodeRef::AssignPat(n, AssignPatField::Left));
           

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I would only need to do that if I were using

assign.left.visit_with_ast_path(this, ast_path);

but I'm doing

pat.visit_children_with_ast_path(self, ast_path)

and the visit_children will handle this for me.
(Just like in the else branch right below)

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Sounds good

@sokra sokra left a comment

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Approved when the ast path is fixed

@sokra
sokra merged commit 39a16ac into canary Aug 26, 2026
115 checks passed
@sokra
sokra deleted the mischnic/improve-pat-assign-modelling branch August 26, 2026 10:15
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