Turbopack: emit/collect followups by mischnic · Pull Request #91474 · vercel/next.js

mischnic · 2026-03-16T21:43:22Z

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mischnic · 2026-03-16T21:43:37Z

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Turbopack: emit/collect followups #91474 👈 (View in Graphite)
Turbopack: reimplement server actions using emit/collect #91212
Turbopack: emit/collect #91100
Turbopack: single module graph for Pages Router pages #91508
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nextjs-bot · 2026-03-16T21:59:03Z

Failing test suites

Commit: a335357 | About building and testing Next.js

pnpm test-dev-turbo test/development/pages-dir/client-navigation/url-hash.test.ts (turbopack) (job)

Client navigation with URL hash > when hash changes with state > when passing state via hash change > should increment the shallow history state counter (DD)

Expand output

● Client navigation with URL hash › when hash changes with state › when passing state via hash change › should increment the shallow history state counter

expect(received).toBe(expected) // Object.is equality

Expected: "SHALLOW HISTORY COUNT: 2"
Received: "SHALLOW HISTORY COUNT: 1"

  253 |           .text()
  254 |
> 255 |         expect(historyCount).toBe('SHALLOW HISTORY COUNT: 2')
      |                              ^
  256 |
  257 |         const counter = await browser.elementByCss('p').text()
  258 |

  at Object.toBe (development/pages-dir/client-navigation/url-hash.test.ts:255:30)

pnpm test-dev-turbo test/e2e/turbopack-emit-collect/index.test.ts (turbopack) (job)

turbopack-emit-collect > works for /pages/a (DD)
turbopack-emit-collect > works for /pages/client-only (DD)

Expand output

● turbopack-emit-collect › works for /pages/a

expect(received).toMatchInlineSnapshot(snapshot)

Snapshot name: `turbopack-emit-collect works for /pages/a 1`

- Snapshot  - 0
+ Received  + 1

  [
    "pages-lib/a/unique.js [ssr]                       : "data-for-unique-pages-a" ==> "unique /pages/a"",
+   "shared-pages-client.js [client]                   : "data-for-shared-pages-a" ==> "shared pages client"",
    "shared-pages-client.js [ssr]                      : "data-for-shared-pages-a" ==> "shared pages client"",
  ]

  169 |       let response = JSON.parse($('#list').text())
  170 |       if (isNextDev) {
> 171 |         expect(formatData(response)).toMatchInlineSnapshot(`
      |                                      ^
  172 |          [
  173 |            "pages-lib/a/unique.js [ssr]                       : "data-for-unique-pages-a" ==> "unique /pages/a"",
  174 |            "shared-pages-client.js [ssr]                      : "data-for-shared-pages-a" ==> "shared pages client"",

  at Object.toMatchInlineSnapshot (e2e/turbopack-emit-collect/index.test.ts:171:38)

● turbopack-emit-collect › works for /pages/client-only

expect(received).toMatchInlineSnapshot(snapshot)

Snapshot name: `turbopack-emit-collect works for /pages/client-only 1`

- Snapshot  - 0
+ Received  + 1

  [
    "pages-lib/client-only/unique.js [ssr]             : "data-for-unique-pages-client-only" ==> "unique /pages/client-only"",
+   "shared-pages-client.js [client]                   : "data-for-shared-pages-client-only" ==> "shared pages client"",
    "shared-pages-client.js [ssr]                      : "data-for-shared-pages-client-only" ==> "shared pages client"",
  ]

  193 |       let response = JSON.parse($('#list').text())
  194 |       if (isNextDev) {
> 195 |         expect(formatData(response)).toMatchInlineSnapshot(`
      |                                      ^
  196 |          [
  197 |            "pages-lib/client-only/unique.js [ssr]             : "data-for-unique-pages-client-only" ==> "unique /pages/client-only"",
  198 |            "shared-pages-client.js [ssr]                      : "data-for-shared-pages-client-only" ==> "shared pages client"",

  at Object.toMatchInlineSnapshot (e2e/turbopack-emit-collect/index.test.ts:195:38)

pnpm test-dev test/e2e/app-dir/instant-navigation-testing-api/instant-navigation-testing-api.test.ts (job)

instant-navigation-testing-api > renders runtime-prefetched content instantly during navigation (DD)

Expand output

● instant-navigation-testing-api › renders runtime-prefetched content instantly during navigation

locator.waitFor: Timeout 60000ms exceeded.
Call log:
  - waiting for locator('[data-testid="search-param-value"]') to be visible

  105 |         '[data-testid="search-param-value"]'
  106 |       )
> 107 |       await searchParamValue.waitFor({ state: 'visible' })
      |                              ^
  108 |       expect(await searchParamValue.textContent()).toContain(
  109 |         'myParam: testValue'
  110 |       )

  at waitFor (e2e/app-dir/instant-navigation-testing-api/instant-navigation-testing-api.test.ts:107:30)
  at instant (../packages/next-playwright/dist/index.js:50:16)
  at Object.<anonymous> (e2e/app-dir/instant-navigation-testing-api/instant-navigation-testing-api.test.ts:99:5)

pnpm test-dev test/development/app-dir/instant-navs-devtools/instant-navs-devtools.test.ts (job)

app dir - basepath > should successfully hard navigate from pages -> app (DD)

Expand output

● app dir - basepath › should successfully hard navigate from pages -> app

page.waitForSelector: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('#page-2') to be visible
    - waiting for" http://localhost:40669/base/another" navigation to finish...

  545 |
  546 |     return this.startChain(async () => {
> 547 |       const el = await page.waitForSelector(selector, {
      |                             ^
  548 |         timeout,
  549 |         state,
  550 |       })

  at waitForSelector (lib/browsers/playwright.ts:547:29)
  at Playwright._chain (lib/browsers/playwright.ts:677:23)
  at Playwright._chain [as startChain] (lib/browsers/playwright.ts:658:17)
  at Playwright.startChain [as waitForElementByCss] (lib/browsers/playwright.ts:546:17)
  at Object.waitForElementByCss (e2e/app-dir/app-basepath/index.test.ts:16:19)

pnpm test-start test/production/app-dir/server-action-period-hash/server-action-period-hash-custom-key.test.ts (job)

app-dir - server-action-period-hash-custom-key > should have a different manifest if the encryption key from process env is changed (DD)
app-dir - server-action-period-hash-custom-key > should have the same manifest if the encryption key from process env is same (DD)

Expand output

● app-dir - server-action-period-hash-custom-key › should have a different manifest if the encryption key from process env is changed

can not run export while server is running, use next.stop() first

  251 |   ) {
  252 |     if (this.childProcess) {
> 253 |       throw new Error(
      |             ^
  254 |         `can not run export while server is running, use next.stop() first`
  255 |       )
  256 |     }

  at NextStartInstance.build (lib/next-modes/next-start.ts:253:13)
  at Object.build (production/app-dir/server-action-period-hash/server-action-period-hash-custom-key.test.ts:18:16)

● app-dir - server-action-period-hash-custom-key › should have the same manifest if the encryption key from process env is same

can not run export while server is running, use next.stop() first

  251 |   ) {
  252 |     if (this.childProcess) {
> 253 |       throw new Error(
      |             ^
  254 |         `can not run export while server is running, use next.stop() first`
  255 |       )
  256 |     }

  at NextStartInstance.build (lib/next-modes/next-start.ts:253:13)
  at Object.build (production/app-dir/server-action-period-hash/server-action-period-hash-custom-key.test.ts:32:16)

codspeed-hq · 2026-03-16T22:05:16Z

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

_{Comparing mischnic/emit-collect-followup (a335357) with mischnic/emit-collect-server-actions (6af3ae0)}

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. ↩

nextjs-bot · 2026-03-16T22:12:07Z

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)	440ms	439ms	✓	▁▇▁▂▂
Cold (First Request)	1.122s	1.119s	✓	▁▇▁▁▁
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	455ms	✓	▁▁▁▁▁
Cold (Ready in log)	438ms	439ms	✓	▂▃▃▁▂
Cold (First Request)	1.873s	1.900s	✓	▁▂▁▁▂
Warm (Listen)	456ms	456ms	✓	▁▁▁▁▁
Warm (Ready in log)	439ms	438ms	✓	▂▃▂▁▁
Warm (First Request)	1.869s	1.903s	✓	▁▁▁▁▂

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.726s	3.738s	✓	▁▇▁▄▄
Cached Build	3.771s	3.766s	✓	▁▇▁▄▃

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	14.394s	14.339s	✓	▁▁▁▁▃
Cached Build	14.598s	14.608s	✓	▁▁▁▁▃
node_modules Size	483 MB	484 MB	✓	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles

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	Canary	PR	Change
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Total	715 B	715 B	✓

Build Details

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	Canary	PR	Change
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pages-api-tu...dev.js gzip	43.4 kB	43.4 kB	✓
pages-api-tu..prod.js gzip	33 kB	33 kB	✓
pages-api.ru...dev.js gzip	43.3 kB	43.3 kB	✓
pages-api.ru..prod.js gzip	33 kB	33 kB	✓
pages-turbo....dev.js gzip	52.7 kB	52.7 kB	✓
pages-turbo...prod.js gzip	38.6 kB	38.6 kB	✓
pages.runtim...dev.js gzip	52.7 kB	52.7 kB	✓
pages.runtim..prod.js gzip	38.6 kB	38.6 kB	✓
server.runti..prod.js gzip	62.4 kB	62.4 kB	✓
Total	2.95 MB	2.95 MB	⚠️ +417 B

📝 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
app-page-tur..ntime.dev.js
app-page-tur..time.prod.js
app-page.runtime.dev.js
app-page.runtime.prod.js
server.runtime.prod.js

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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/a3353570797047cca7fa0e4db81e21cd3bd2f34b/next

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Mar 16, 2026

This was referenced Mar 16, 2026

Turbopack: emit/collect #91100

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Turbopack: reimplement server actions using emit/collect #91212

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mischnic changed the title ~~next-app-route Transition~~ Turbopack: emit/collect followups Mar 16, 2026

mischnic mentioned this pull request Mar 16, 2026

Turbopack: use ChunkGroupEntry::Shared, part 2 #91279

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mischnic changed the base branch from mischnic/emit-collect-server-actions to graphite-base/91474 March 17, 2026 15:18

mischnic mentioned this pull request Mar 17, 2026

Turbopack: single module graph for Pages Router pages #91508

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mischnic force-pushed the graphite-base/91474 branch from 07e6aaa to 689ac31 Compare March 18, 2026 12:58

mischnic force-pushed the mischnic/emit-collect-followup branch from 34649c5 to 5d3fd1c Compare March 18, 2026 12:58

mischnic changed the base branch from graphite-base/91474 to mischnic/emit-collect-server-actions March 18, 2026 12:59

next-app-route Transition

a335357

mischnic force-pushed the mischnic/emit-collect-followup branch from 5d3fd1c to a335357 Compare March 18, 2026 13:34

mischnic force-pushed the mischnic/emit-collect-server-actions branch from 689ac31 to 6af3ae0 Compare March 18, 2026 13:34

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