turbopack-cli: add --persistent-caching flag for filesystem-backed cache by sokra · Pull Request #91657 · vercel/next.js

sokra · 2026-03-19T15:33:30Z

What?

Adds --persistent-caching and --cache-dir CLI flags to turbopack dev and turbopack build in the standalone turbopack-cli crate.

Why?

The standalone turbopack-cli binary (used independently of next) had no way to opt into the filesystem-backed persistent cache that the next-napi-bindings integration already supports. Without this, repeated builds always start cold — every incremental run re-computes the full task graph from scratch.

How?

build.rs (new): A Cargo build script that uses vergen-gitcl to emit VERGEN_GIT_DESCRIBE and VERGEN_GIT_DIRTY as compile-time env vars. These are used to key the cache by git version, matching the same approach as next-napi-bindings. The build script embeds the dirty state at compile time rather than runtime to avoid a git subprocess on every startup.

The dirty-state caching tradeoff (explained in the build script comment): there's a narrow edge case where the tree becomes newly dirty without triggering a Cargo rebuild, but in practice this is safe — if nothing in the crate changed, the binary is semantically equivalent to a clean build, so using the HEAD hash as the cache key is correct.

arguments.rs: Two new flags on CommonArguments (shared by both dev and build subcommands):

--persistent-caching — opt-in flag to enable the filesystem cache
--cache-dir <PATH> — override the cache directory (defaults to .turbopack/cache in the project root)

dev/mod.rs and build/mod.rs:

The Backend type alias changes from TurboTasksBackend<NoopBackingStorage> to TurboTasksBackend<Either<TurboBackingStorage, NoopBackingStorage>> to unify the type without dynamic dispatch.
When --persistent-caching is set: initializes TurboBackingStorage via turbo_backing_storage(), selects StorageMode::ReadWriteOnShutdown for CI/short sessions and StorageMode::ReadWrite for interactive dev, and prints a warning if the cache was invalidated on startup.
When not set: falls back to noop_backing_storage() — identical behavior to before.
Respects the TURBO_ENGINE_READ_ONLY env var to force read-only mode.

codspeed-hq · 2026-03-19T15:43:17Z

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 3 skipped benchmarks¹

_{Comparing sokra/turbopack-cli (110d762) with canary (8cbc037)}

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 · 2026-03-19T16:25:43Z

Failing test suites

Commit: 7ab991a | About building and testing Next.js

pnpm test-start test/e2e/app-dir/segment-cache/prefetch-inlining/prefetch-inlining.test.ts (job)

next-types-plugin > should have type for root page (DD)
next-types-plugin > should have type for root layout (DD)
next-types-plugin > should have type for nested page (DD)
next-types-plugin > should have type for nested layout (DD)
next-types-plugin > should have type for dynamic page (DD)
next-types-plugin > should have type for dynamic layout (DD)

Expand output

● next-types-plugin › should have type for root page

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

Expected: true
Received: false

  12 |     it('should have type for root page', async () => {
  13 |       expect(await next.hasFile('app/page.tsx')).toBe(true)
> 14 |       expect(await next.hasFile('.next/types/app/page.ts')).toBe(true)
     |                                                             ^
  15 |     })
  16 |     it('should have type for root layout', async () => {
  17 |       expect(await next.hasFile('app/layout.tsx')).toBe(true)

  at Object.toBe (production/app-dir/next-types-plugin/basic/index.test.ts:14:61)

● next-types-plugin › should have type for root layout

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

Expected: true
Received: false

  16 |     it('should have type for root layout', async () => {
  17 |       expect(await next.hasFile('app/layout.tsx')).toBe(true)
> 18 |       expect(await next.hasFile('.next/types/app/layout.ts')).toBe(true)
     |                                                               ^
  19 |     })
  20 |     it('should have type for nested page', async () => {
  21 |       expect(await next.hasFile('app/nested/page.tsx')).toBe(true)

  at Object.toBe (production/app-dir/next-types-plugin/basic/index.test.ts:18:63)

● next-types-plugin › should have type for nested page

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

Expected: true
Received: false

  20 |     it('should have type for nested page', async () => {
  21 |       expect(await next.hasFile('app/nested/page.tsx')).toBe(true)
> 22 |       expect(await next.hasFile('.next/types/app/nested/page.ts')).toBe(true)
     |                                                                    ^
  23 |     })
  24 |     it('should have type for nested layout', async () => {
  25 |       expect(await next.hasFile('app/nested/layout.tsx')).toBe(true)

  at Object.toBe (production/app-dir/next-types-plugin/basic/index.test.ts:22:68)

● next-types-plugin › should have type for nested layout

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

Expected: true
Received: false

  24 |     it('should have type for nested layout', async () => {
  25 |       expect(await next.hasFile('app/nested/layout.tsx')).toBe(true)
> 26 |       expect(await next.hasFile('.next/types/app/nested/layout.ts')).toBe(true)
     |                                                                      ^
  27 |     })
  28 |     it('should have type for dynamic page', async () => {
  29 |       expect(await next.hasFile('app/[dynamic]/page.tsx')).toBe(true)

  at Object.toBe (production/app-dir/next-types-plugin/basic/index.test.ts:26:70)

● next-types-plugin › should have type for dynamic page

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

Expected: true
Received: false

  28 |     it('should have type for dynamic page', async () => {
  29 |       expect(await next.hasFile('app/[dynamic]/page.tsx')).toBe(true)
> 30 |       expect(await next.hasFile('.next/types/app/[dynamic]/page.ts')).toBe(true)
     |                                                                       ^
  31 |     })
  32 |     it('should have type for dynamic layout', async () => {
  33 |       expect(await next.hasFile('app/[dynamic]/layout.tsx')).toBe(true)

  at Object.toBe (production/app-dir/next-types-plugin/basic/index.test.ts:30:71)

● next-types-plugin › should have type for dynamic layout

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

Expected: true
Received: false

  32 |     it('should have type for dynamic layout', async () => {
  33 |       expect(await next.hasFile('app/[dynamic]/layout.tsx')).toBe(true)
> 34 |       expect(await next.hasFile('.next/types/app/[dynamic]/layout.ts')).toBe(
     |                                                                         ^
  35 |         true
  36 |       )
  37 |     })

  at Object.toBe (production/app-dir/next-types-plugin/basic/index.test.ts:34:73)

nextjs-bot · 2026-03-19T16:25:43Z

Failing test suites

Commit: 110d762 | About building and testing Next.js

pnpm test-start-turbo test/production/dynamic-css-client-navigation/react-lazy.test.ts (turbopack) (job)

dynamic-css-client-navigation react lazy nodejs > should not remove style when navigating from static imported component to react lazy at runtime nodejs (DD)

Expand output

● dynamic-css-client-navigation react lazy nodejs › should not remove style when navigating from static imported component to react lazy at runtime nodejs

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

Expected: "rgb(255, 0, 0)"
Received: null

  22 |       )
  23 |
> 24 |       expect(buttonBgColor).toBe('rgb(255, 0, 0)')
     |                             ^
  25 |     })
  26 |   }
  27 | )

  at Object.toBe (production/dynamic-css-client-navigation/react-lazy.test.ts:24:29)

pnpm test-start-turbo test/e2e/app-dir/app-client-cache/client-cache.parallel-routes.test.ts (turbopack) (job)

Graceful Shutdown > production (standalone mode) > should not accept new requests during shutdown cleanup > should stop accepting new requests when shutting down (DD)

Expand output

● Graceful Shutdown › production (standalone mode) › should not accept new requests during shutdown cleanup › should stop accepting new requests when shutting down

expect(received).toEqual(expected) // deep equality

- Expected  - 1
+ Received  + 1

  Array [
-   143,
    null,
+   "SIGTERM",
  ]

  227 |
  228 |         // App finally shuts down with signal-based exit code (128 + 15 for SIGTERM)
> 229 |         expect(await appKilledPromise).toEqual([143, null])
      |                                        ^
  230 |         expect(app.exitCode).toBe(143)
  231 |       })
  232 |     })

  at Object.toEqual (production/graceful-shutdown/index.test.ts:229:40)

pnpm test-start test/e2e/app-dir/use-node-streams-env-precedence/use-node-streams-env-precedence.test.ts (job)

use-node-streams env precedence > should respect explicit useNodeStreams=false even when env flag is true (DD)

Expand output

● use-node-streams env precedence › should respect explicit useNodeStreams=false even when env flag is true

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 (e2e/app-dir/use-node-streams-env-precedence/use-node-streams-env-precedence.test.ts:19:48)

nextjs-bot · 2026-03-19T16:40:01Z

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)	507ms	506ms	✓	▁▁▁▁▁
Cold (Ready in log)	470ms	472ms	✓	▁▁▁▁▁
Cold (First Request)	935ms	939ms	✓	▁▁▃▄▃
Warm (Listen)	509ms	508ms	✓	▁▁▁▁▁
Warm (Ready in log)	467ms	472ms	✓	▁▁▁▁▁
Warm (First Request)	347ms	347ms	✓	▁▁▁▁▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	507ms	508ms	✓	█▅▁▁▁
Cold (Ready in log)	493ms	494ms	✓	█▅▁▁▁
Cold (First Request)	2.265s	2.260s	✓	█▆▁▂▁
Warm (Listen)	507ms	507ms	✓	█▅▁▁▁
Warm (Ready in log)	489ms	488ms	✓	█▆▁▁▁
Warm (First Request)	2.275s	2.257s	✓	█▆▁▁▁

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.395s	4.352s	✓	▁▂▂▁▁
Cached Build	4.421s	4.403s	✓	▁▂▂▁▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	16.695s	16.776s	✓	█▆▁▁▁
Cached Build	16.835s	16.902s	✓	█▆▁▁▁
node_modules Size	484 MB	484 MB	✓	▁▁▁▁▁

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles

	Canary	PR	Change
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turbopack-12..4wtb.js gzip	N/A	4.16 kB	-
Total	463 kB	463 kB	✅ -15 B

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	713 B	711 B	✓
Total	713 B	711 B	✅ -2 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	427 B	432 B	🔴 +5 B (+1%)
Total	427 B	432 B	⚠️ +5 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.54 kB	N/A	-
6280-HASH.js gzip	60.4 kB	N/A	-
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262-HASH.js gzip	N/A	4.59 kB	-
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9544-HASH.js gzip	N/A	61.1 kB	-
Total	234 kB	235 kB	⚠️ +672 B

Polyfills

	Canary	PR	Change
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Total	39.4 kB	39.4 kB	✓

Pages

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Server

Edge SSR

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Middleware

	Canary	PR	Change
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middleware.js gzip	43.7 kB	44 kB	✓
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Build Details

Build Manifests

	Canary	PR	Change
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Build Cache

	Canary	PR	Change
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🔄 Shared (bundler-independent)

Runtimes

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app-route-ex...dev.js gzip	76.2 kB	76.2 kB	✓
app-route-ex..prod.js gzip	51.8 kB	51.8 kB	✓
app-route-tu...dev.js gzip	76.2 kB	76.2 kB	✓
app-route-tu..prod.js gzip	51.9 kB	51.9 kB	✓
app-route-tu...dev.js gzip	75.8 kB	75.8 kB	✓
app-route-tu..prod.js gzip	51.6 kB	51.6 kB	✓
app-route.ru...dev.js gzip	75.8 kB	75.8 kB	✓
app-route.ru..prod.js gzip	51.6 kB	51.6 kB	✓
dist_client_...dev.js gzip	324 B	324 B	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
dist_client_...dev.js gzip	317 B	317 B	✓
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	43.4 kB	43.4 kB	✓
pages-api.ru..prod.js gzip	33 kB	33 kB	✓
pages-turbo....dev.js gzip	52.8 kB	52.8 kB	✓
pages-turbo...prod.js gzip	38.6 kB	38.6 kB	✓
pages.runtim...dev.js gzip	52.8 kB	52.8 kB	✓
pages.runtim..prod.js gzip	38.6 kB	38.6 kB	✓
server.runti..prod.js gzip	62.5 kB	62.5 kB	✓
Total	2.96 MB	2.96 MB	⚠️ +2 B

📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/110d762ad2bd8a5bc3b7e881721ff7633eb789a1/next

Adds `--persistent-caching` and `--cache-dir` CLI flags to both `turbopack dev` and `turbopack build`. When enabled, uses `turbo_backing_storage` with the git HEAD describe/dirty state as the cache version key, matching the same pattern used by next-napi-bindings. Co-Authored-By: Claude <[email protected]>

…nts fields The small_apps bench used a positional struct literal for CommonArguments which broke after adding persistent_caching and cache_dir fields. Add them with their false/None defaults. Co-Authored-By: Claude <[email protected]>

turbopack/crates/turbopack-cli/src/build/mod.rs

turbopack/crates/turbopack-cli/src/dev/mod.rs

Co-Authored-By: Claude <[email protected]>

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. Turbopack Related to Turbopack with Next.js. labels Mar 19, 2026

sokra marked this pull request as ready for review March 19, 2026 15:56

sokra requested a review from mischnic March 19, 2026 15:56

mischnic approved these changes Mar 19, 2026

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sokra and others added 2 commits March 19, 2026 19:30

sokra force-pushed the sokra/turbopack-cli branch from 7ab991a to 51405d8 Compare March 19, 2026 19:30

lukesandberg reviewed Mar 19, 2026

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turbopack/crates/turbopack-cli/src/build/mod.rs Outdated Show resolved Hide resolved

lukesandberg reviewed Mar 19, 2026

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lukesandberg approved these changes Mar 19, 2026

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fix(turbopack-cli): build is always a short session, not just in CI

110d762

Co-Authored-By: Claude <[email protected]>

sokra merged commit 7984e4a into canary Mar 20, 2026
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sokra deleted the sokra/turbopack-cli branch March 20, 2026 18:15

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turbopack-cli: add --persistent-caching flag for filesystem-backed cache#91657

turbopack-cli: add --persistent-caching flag for filesystem-backed cache#91657
sokra merged 3 commits intocanaryfrom
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Merging this PR will not alter performance

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