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Turbopack: reimplement server actions using emit/collect#91212

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Turbopack: reimplement server actions using emit/collect#91212
mischnic wants to merge 11 commits intomischnic/emit-collectfrom
mischnic/emit-collect-server-actions

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@mischnic mischnic commented Mar 11, 2026 •
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Benefits:

  1. Less special casing, removes the base/full dual module graph setup
  2. you get proper import traces across server actions (for errors and for the bundle analyzer)
  3. client reference --imports--> server action --imports–-> client reference works now
  4. There is no "server action loader module" at all anymore. So server actions get lazily initialized now, as opposed to the first server action initializing everything
  • the "don't compile edge when using nodejs runtime" optimization
  • test for "don't compile edge when using nodejs runtime"
  • test cases for:
    • import traces, and
    • enable in app-action.test.ts: client component imported action client->server->client

@nextjs-bot nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. tests Turbopack Related to Turbopack with Next.js. type: next labels Mar 11, 2026
@mischnic mischnic mentioned this pull request Mar 11, 2026
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mischnic commented Mar 11, 2026 •
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@mischnic mischnic mentioned this pull request Mar 11, 2026
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@mischnic mischnic changed the title Adjust server actions transform Turbopack: reimplement server actions using emit/collect Mar 11, 2026
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nextjs-bot commented Mar 11, 2026 •
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Tests Passed

@mischnic mischnic force-pushed the mischnic/emit-collect branch from 235ed87 to 0b93444 Compare March 11, 2026 18:25
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from 03f095b to e7e45ab Compare March 11, 2026 18:25
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codspeed-hq bot commented Mar 11, 2026 •
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Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks1

Comparing mischnic/emit-collect-server-actions (6af3ae0) with mischnic/emit-collect (a77fc9d)2

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. ↩

  2. No successful run was found on mischnic/emit-collect (987f46c) during the generation of this report, so 3c2c620 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

@mischnic mischnic force-pushed the mischnic/emit-collect branch from 0b93444 to 57a7fa7 Compare March 11, 2026 18:32
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from e7e45ab to 3e17914 Compare March 11, 2026 18:32
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nextjs-bot commented Mar 11, 2026 •
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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) 436ms 435ms ✓ ▁▇▁▂▂
Cold (First Request) 1.098s 1.126s ✓ ▁▇▁▁▁
Warm (Listen) 456ms 456ms ✓ ▁▇▁▃▂
Warm (Ready in log) 439ms 445ms ✓ ▁▇▁▂▂
Warm (First Request) 339ms 336ms ✓ ▂▇▁▃▂
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change Trend
Cold (Listen) 455ms 455ms ✓ ▁▁▁▁▁
Cold (Ready in log) 437ms 439ms ✓ ▂▃▃▁▂
Cold (First Request) 1.948s 1.949s ✓ ▁▂▁▁▂
Warm (Listen) 456ms 456ms ✓ ▁▁▁▁▁
Warm (Ready in log) 438ms 438ms ✓ ▂▃▂▁▁
Warm (First Request) 1.953s 1.972s ✓ ▁▁▁▁▂

⚡ Production Builds

Metric Canary PR Change Trend
Fresh Build 3.718s 3.675s ✓ ▁▇▁▄▄
Cached Build 3.778s 3.674s ✓ ▁▇▁▄▃
📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric Canary PR Change Trend
Fresh Build 14.376s 14.429s ✓ ▁▁▁▁▃
Cached Build 14.614s 14.616s ✓ ▁▁▁▁▃
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📝 Changed Files (9 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
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@mischnic mischnic force-pushed the mischnic/emit-collect branch 2 times, most recently from 36eb1db to 22f5ea9 Compare March 11, 2026 21:17
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch 2 times, most recently from 282d418 to 9914249 Compare March 11, 2026 21:44
@mischnic mischnic force-pushed the mischnic/emit-collect branch 2 times, most recently from 600758e to 89fa531 Compare March 11, 2026 22:41
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch 3 times, most recently from 22da33f to a460780 Compare March 12, 2026 15:12
@mischnic mischnic force-pushed the mischnic/emit-collect branch from 89fa531 to 281abf1 Compare March 12, 2026 15:12
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch 2 times, most recently from ffa1de0 to 9b3ccf0 Compare March 12, 2026 20:50
@mischnic mischnic force-pushed the mischnic/emit-collect branch from 281abf1 to 540394c Compare March 12, 2026 20:50
@mischnic mischnic mentioned this pull request Mar 12, 2026
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@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from 567d8b1 to 2c4ce67 Compare March 14, 2026 12:26
@mischnic mischnic force-pushed the mischnic/emit-collect branch 2 times, most recently from 1f90807 to 9db4052 Compare March 15, 2026 22:41
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch 2 times, most recently from 3d362e3 to 7addf8c Compare March 16, 2026 10:00
@mischnic mischnic force-pushed the mischnic/emit-collect branch 2 times, most recently from d6ee412 to 3da7aa5 Compare March 16, 2026 11:03
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from 7addf8c to ed6f396 Compare March 16, 2026 13:12
@mischnic mischnic force-pushed the mischnic/emit-collect branch 2 times, most recently from 8a1f9d8 to 2c0a21b Compare March 16, 2026 21:43
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from ed6f396 to 07e6aaa Compare March 16, 2026 21:43
@mischnic mischnic mentioned this pull request Mar 16, 2026
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@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from 07e6aaa to 26f0951 Compare March 17, 2026 15:18
@mischnic mischnic force-pushed the mischnic/emit-collect branch from 2c0a21b to d184b6b Compare March 17, 2026 15:18
@mischnic mischnic mentioned this pull request Mar 17, 2026
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@mischnic mischnic force-pushed the mischnic/emit-collect branch from d184b6b to a77fc9d Compare March 18, 2026 12:58
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from 26f0951 to 689ac31 Compare March 18, 2026 12:58
@mischnic mischnic force-pushed the mischnic/emit-collect branch from a77fc9d to 987f46c Compare March 18, 2026 13:34
@mischnic mischnic force-pushed the mischnic/emit-collect-server-actions branch from 689ac31 to 6af3ae0 Compare March 18, 2026 13:34
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