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[turbopack] Treat Object.defineProperty(exports, …, { value: … }) as side-effect free - #96273

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sp/define-property-side-effects
Jul 28, 2026
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[turbopack] Treat Object.defineProperty(exports, …, { value: … }) as side-effect free#96273
sampoder merged 2 commits into
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sp/define-property-side-effects

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Treat code like this:

Object.defineProperty(exports, '__esModule', { value: true });
exports.foo = 1;

As side-effect free. This is an extension of the work on #94293 and will allow #95718 to drop more dead requires.

@sampoder
sampoder requested review from bgw and lukesandberg July 27, 2026 18:53
@sampoder
sampoder force-pushed the sp/define-property-side-effects branch 2 times, most recently from c31662f to 07735a9 Compare July 27, 2026 21:33
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Tests Passed

Commit: 44fcd34

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Stats from current PR

🔴 2 regressions

Metric Canary PR Change Trend
Webpack Cold (First Request) 3.318s 3.440s 🔴 +122ms (+4%) ▂█▅▃▃
Webpack Warm (First Request) 3.322s 3.478s 🔴 +156ms (+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) 1.065s 1.065s █▂▁▁▂
Cold (Ready in log) 1.038s 1.032s █▂▁▁▁
Cold (First Request) 1.710s 1.684s █▂▁▁▁
Warm (Listen) 1.064s 1.064s █▂▁▁▂
Warm (Ready in log) 1.035s 1.040s █▂▁▁▁
Warm (First Request) 1.672s 1.685s █▂▁▂▁
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 814ms 813ms ▅█▅▁▅
Cold (Ready in log) 777ms 804ms ▃█▆▁▅
Cold (First Request) 3.318s 3.440s 🔴 +122ms (+4%) ▂█▅▃▃
Warm (Listen) 813ms 813ms ███▁█
Warm (Ready in log) 776ms 792ms ▃█▆▁▄
Warm (First Request) 3.322s 3.478s 🔴 +156ms (+5%) ▄█▇▂▃

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 7.043s 7.083s █▂▁▁▁
Cached Build 7.217s 7.217s █▃▁▁▁
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 23.912s 24.287s ▁██▃▅
Cached Build 24.265s 24.518s ▁█▇▁▄
node_modules Size 550 MB 550 MB ▁▁███
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Bundle Sizes

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Middleware
Canary PR Change
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Total 776 B 774 B ✅ -2 B
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Canary PR Change
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Polyfills
Canary PR Change
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Total 39.4 kB 39.4 kB
Pages
Canary PR Change
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css-HASH.js gzip 334 B 331 B
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Server

Edge SSR
Canary PR Change
edge-ssr.js gzip 129 kB 128 kB
page.js gzip 292 kB 293 kB
Total 421 kB 421 kB ⚠️ +411 B
Middleware
Canary PR Change
middleware-b..fest.js gzip 617 B 618 B
middleware-r..fest.js gzip 156 B 156 B
middleware.js gzip 45.8 kB 45.2 kB 🟢 531 B (-1%)
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Total 47.4 kB 46.9 kB ✅ -530 B
Build Details
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Canary PR Change
_buildManifest.js gzip 718 B 718 B
Total 718 B 718 B
Build Cache
Canary PR Change
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index.pack gzip 124 kB 123 kB
index.pack.old gzip 123 kB 124 kB 🔴 +1.42 kB (+1%)
Total 5.07 MB 5.07 MB ✅ -6.59 kB

🔄 Shared (bundler-independent)

Runtimes
Canary PR Change
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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
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app-page-tur..prod.js gzip 203 kB 203 kB
app-page.run...dev.js gzip 368 kB 368 kB
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dev-validati...dev.js gzip 130 kB 130 kB
dist_client_...dev.js gzip 324 B 324 B
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dist_client_...dev.js gzip 317 B 317 B
pages-api-tu...dev.js gzip 45.5 kB 45.5 kB
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use-cache-pr...dev.js gzip 72 kB 72 kB
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Total 4.08 MB 4.08 MB
📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/44fcd34fe325209ff293fef9823ddc2a66114082/next

Commit: 44fcd34

Comment thread turbopack/crates/turbopack-ecmascript/src/analyzer/side_effects.rs Outdated
sampoder and others added 2 commits July 28, 2026 11:09
@sampoder
sampoder force-pushed the sp/define-property-side-effects branch from 4b3845a to 44fcd34 Compare July 28, 2026 18:10
@sampoder
sampoder merged commit d61f16e into canary Jul 28, 2026
128 checks passed
@sampoder
sampoder deleted the sp/define-property-side-effects branch July 28, 2026 18:40
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