[turbopack] Inline the chunk group bootstrap in Next.js to drop the per-route runtime#94666
Merged
sampoder merged 1 commit intoJul 16, 2026
Conversation
Contributor
Stats from current PR🔴 1 regression
📊 All Metrics📖 Metrics GlossaryDev Server Metrics:
Build Metrics:
Change Thresholds:
⚡ Dev Server
📦 Dev Server (Webpack) (Legacy)📦 Dev Server (Webpack)
⚡ Production Builds
📦 Production Builds (Webpack) (Legacy)📦 Production Builds (Webpack)
📦 Bundle SizesBundle Sizes⚡ TurbopackClient Main Bundles
Server Middleware
Build DetailsBuild Manifests
📦 WebpackClient Main Bundles
Polyfills
Pages
Server Edge SSR
Middleware
Build DetailsBuild Manifests
Build Cache
🔄 Shared (bundler-independent)Runtimes
📝 Changed Files (10 files)Files with changes:
View diffsapp-page-exp..ntime.dev.jsfailed to diffapp-page-exp..time.prod.jsfailed to diffapp-page-tur..ntime.dev.jsfailed to diffapp-page-tur..time.prod.jsDiff too large to display app-page-tur..ntime.dev.jsfailed to diffapp-page-tur..time.prod.jsfailed to diffapp-page.runtime.dev.jsfailed to diffapp-page.runtime.prod.jsfailed to diffpages-api-tu..time.prod.jsDiff too large to display pages-turbo...time.prod.jsDiff too large to display 📎 Tarball URLCommit: a5aa5a9 |
Contributor
Tests PassedCommit: a5aa5a9 |
![vercel[bot]](https://avatars.github.com/in/8329?s=60&v=4){kind=small}
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 10, 2026 18:48
0fb778a to
cd89baf
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 10, 2026 18:48
fb9cb49 to
4d9e156
Compare
sampoder
changed the title
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 10, 2026 19:05
4d9e156 to
473a8cb
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 10, 2026 19:05
cd89baf to
9475cf8
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 10, 2026 20:57
473a8cb to
a9756ee
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 10, 2026 20:57
9475cf8 to
99feb4c
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 10, 2026 21:40
99feb4c to
741e40d
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 10, 2026 21:40
a9756ee to
17fcd4e
Compare
sampoder
changed the title
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 10, 2026 21:49
741e40d to
7a7cec6
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 10, 2026 22:21
17fcd4e to
05d9e37
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
2 times, most recently
from
June 16, 2026 18:28
797e139 to
9a16987
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
2 times, most recently
from
June 16, 2026 18:33
6c44f9f to
b4a40da
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 16, 2026 18:33
9a16987 to
830c7a0
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 16, 2026 18:36
b4a40da to
9ea672c
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
2 times, most recently
from
June 16, 2026 18:41
7bde6dd to
b266287
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 16, 2026 18:41
9ea672c to
9fb9b81
Compare
sampoder
marked this pull request as ready for review
June 16, 2026 18:49
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 30, 2026 21:46
b266287 to
f383bad
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 30, 2026 21:46
9fb9b81 to
7da768a
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
June 30, 2026 21:59
f383bad to
f4a9fbe
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
2 times, most recently
from
June 30, 2026 22:09
a79706e to
e11f239
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
2 times, most recently
from
June 30, 2026 22:10
8a3db7e to
9b8e3dc
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
June 30, 2026 22:10
e11f239 to
158bce5
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
5 times, most recently
from
June 30, 2026 22:38
3710e34 to
bf07da2
Compare
bgw
approved these changes
Jul 1, 2026
Comment on lines
+253
to
+254
| // Run a navigated route's inlined bootstrap so its entry module executes and | ||
| // registers via `window.__NEXT_P`. The initial page is bootstrapped in the document. |
Member
There was a problem hiding this comment.
Is this used for navigation? Or initial page load? Or both?
| ): string | undefined { | ||
| const paramsByPage = buildManifest.pagesChunkGroupBootstrapParams | ||
| const chunkLoadingGlobal = buildManifest.chunkLoadingGlobal | ||
| if (!paramsByPage || !chunkLoadingGlobal) return undefined |
| `(globalThis[${g}] || (globalThis[${g}] = [])).push(${params});` | ||
| ) | ||
|
|
||
| return statements.length > 0 ? statements.join('\n') : undefined |
Member
There was a problem hiding this comment.
Can statements.length be 0? Should this be able to return undefined?
Member
Author
There was a problem hiding this comment.
yeah, because this is feature flagged now this is possible
| '/_app', | ||
| __NEXT_DATA__.page, | ||
| ]) | ||
| if (!bootstrap) return null |
Member
There was a problem hiding this comment.
Should it actually be possible for getTurbopackChunkGroupBootstrap to return null or undefined?
| if (bootstrappedRoutes.has(route)) return | ||
| const params = self.__TURBOPACK_PAGE_BOOTSTRAP?.[route] | ||
| const global = self.__TURBOPACK_CHUNK_LOADING_GLOBAL | ||
| if (params == null || !global) return |
Comment on lines
+4100
to
+4104
| const errorBootstrapScriptContent = process.env.__NEXT_DEV_SERVER | ||
| ? bootstrapScriptContent | ||
| : getTurbopackChunkGroupBootstrap(buildManifest, [ | ||
| UNDERSCORE_NOT_FOUND_ROUTE_ENTRY, | ||
| ]) |
Member
There was a problem hiding this comment.
Is this meaningfully different than bootstrapScriptContent above? Is page !== UNDERSCORE_NOT_FOUND_ROUTE_ENTRY
Member
Author
There was a problem hiding this comment.
yes - bootstrapScriptContent would be for the original page you were requesting before the error happened
Comment on lines
+595
to
+596
| const paramsByRoute = m.pagesChunkGroupBootstrapParams | ||
| if (!paramsByRoute) continue |
Member
There was a problem hiding this comment.
This parameter in SerializedBuildManifest is not nullable?
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
July 15, 2026 18:56
bf07da2 to
9a9f1a6
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
2 times, most recently
from
July 15, 2026 22:25
8baa0f5 to
e1517db
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
July 15, 2026 22:25
9a9f1a6 to
b321f68
Compare
sampoder
force-pushed
the
sp/turbopack/registration-code-build-manifest
branch
from
July 16, 2026 01:03
e1517db to
3c77fb8
Compare
sampoder
force-pushed
the
sp/turbopack/inline-registration-code
branch
from
July 16, 2026 01:03
b321f68 to
a5aa5a9
Compare
sampoder
added a commit
that referenced
this pull request
Jul 16, 2026
…text` and `chunk_group_bootstrap_params` to `ChunkGroupResult` (#94661) We used to generate the runtime file for each `ChunkGroupResult` in `evaluated_chunk_group()`, I've added `chunk_group_bootstrap_params` which are the parameters that were unique to each chunk group. These are inlined into each page's HTML in #94666. They look like: ```javascript {"otherChunks":["output/0_9x_turbopack-tests_tests_snapshot_basic-tree-shake_export-namespace_input_1mqgz2-._.js"], "runtimeModuleIds":["[project]/turbopack/crates/turbopack-tests/tests/snapshot/basic-tree-shake/export-namespace/input/index.js [test] (ecmascript)"]} ``` Whether or not the inline-able code is generated is based on the `inline_chunk_group_bootstrap` which is still false in all cases at the moment but will be turned to true in #94666.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This PR builds on top of the other PRs in this stack, it is the PR that switches to inlining the bootstrap code and dropping the runtime file that each route had.