Update the webpack version bundled in next by lukesandberg · Pull Request #89569 · vercel/next.js

lukesandberg · 2026-02-06T01:26:34Z

Upgrade webpack 5.98.0 → 5.105.0

Updates webpack from 5.98.0 to 5.105.0 and webpack-dev-server from 5.2.0 to 5.2.3.

Notable webpack changes

New Features:

Native tsconfig resolver option - can replace tsconfig-paths-webpack-plugin (v5.105.0)
import.defer() support for context modules (v5.105.0)
Array values for devtool option (v5.105.0)
Built-in DotenvPlugin and top-level dotenv option (v5.103.0)
Built-in WebpackManifestPlugin (v5.103.0)
import.meta.env, import.meta.dirname, import.meta.filename support (v5.103.0)
CSS exportType option (link, text, css-style-sheet) (v5.103.0)
New import types: { type: "bytes" } and { type: "text" } (v5.102.0)
Tree-shaking for ESM external modules with named imports (v5.101.0)

Stabilized (no longer experimental):

topLevelAwait (v5.102.0)
layers (v5.102.0)

Bug Fixes & Security:

Security fix in HttpUriPlugin (v5.104.1)
Various fixes for reexport runtime calculations, module concatenation performance

webpack-dev-server 5.2.0 → 5.2.3

ESC key to dismiss error overlay (v5.2.3)
Fixed crash when error is null for runtime errors (v5.2.2)
Improved cross-origin request validation (v5.2.1)

HMR race condition fix

Webpack 5.104+ added a module existence check in `webpack_require` (when `output.pathinfo` is true, the default in dev mode) that surfaced a pre-existing race condition in Next.js's HMR protocol.

The race: When a server component changes, the dev server sends `BUILT` (triggering async `module.hot.apply()`) followed by `SERVER_COMPONENT_CHANGES` (triggering `hmrRefresh()`). Previously, `hmrRefresh()` fired immediately without waiting for the webpack update to finish, so `webpack_require` could be called for client components that were temporarily absent from `webpack_modules` during the swap. This was silently caught by React error boundaries with old webpack, but the new explicit module existence check turns it into a hard error.

The fix: Wait for the pending webpack HMR promise to resolve before calling `hmrRefresh()`, ensuring all modules are fully in place before the RSC response references them.

Known Breaking changes

Breaking change for `experimental.urlImports` users: Webpack 5.105.0 now validates redirect target URLs against the `allowedUris` policy. If your URL imports redirect to a different domain (e.g., `github.com/...` → `raw.githubusercontent.com/...`), you must add the redirect target domain to your `urlImports` array.

Full changelogs

Blocked on webpack/webpack#20475

Fixes #89177

lukesandberg · 2026-02-06T01:26:53Z

Update the webpack version bundled in next #89569 👈 (View in Graphite)
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nextjs-bot · 2026-02-06T03:31:34Z

Failing test suites

Commit: 2608499 | About building and testing Next.js

pnpm test-dev test/development/app-dir/hmr-iframe/hmr-iframe.test.ts (job)

app-dir hmr-env > should update server components pages when env files is changed (edge) (DD)
app-dir hmr-env > should update server components pages when env files is changed (edge-module-var) (DD)

Expand output

● app-dir hmr-env › should update server components pages when env files is changed (edge)

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

Expected: "ipad"
Received: "mac"

  19 |       await next.patchFile(envFile, 'MY_DEVICE="ipad"', async () => {
  20 |         await retry(async () => {
> 21 |           expect(await browser.elementByCss('p').text()).toBe('ipad')
     |                                                          ^
  22 |         })
  23 |       })
  24 |

  at toBe (development/app-hmr/hmr-env.test.ts:21:58)
  at retry (lib/next-test-utils.ts:831:14)
  at development/app-hmr/hmr-env.test.ts:20:9
  at NextDevInstance.patchFile (lib/next-modes/base.ts:729:9)
  at NextDevInstance.patchFile (lib/next-modes/next-dev.ts:303:16)
  at development/app-hmr/hmr-env.test.ts:19:7

● app-dir hmr-env › should update server components pages when env files is changed (edge-module-var)

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

Expected: "ipad"
Received: "mac"

  19 |       await next.patchFile(envFile, 'MY_DEVICE="ipad"', async () => {
  20 |         await retry(async () => {
> 21 |           expect(await browser.elementByCss('p').text()).toBe('ipad')
     |                                                          ^
  22 |         })
  23 |       })
  24 |

  at toBe (development/app-hmr/hmr-env.test.ts:21:58)
  at retry (lib/next-test-utils.ts:831:14)
  at development/app-hmr/hmr-env.test.ts:20:9
  at NextDevInstance.patchFile (lib/next-modes/base.ts:729:9)
  at NextDevInstance.patchFile (lib/next-modes/next-dev.ts:303:16)
  at development/app-hmr/hmr-env.test.ts:19:7

pnpm test-dev test/development/app-hmr/hmr.test.ts (job)

app-dir-hmr > filesystem changes > should update server components after navigating to a page with a different runtime (DD)

Expand output

● app-dir-hmr › filesystem changes › should update server components after navigating to a page with a different runtime

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

Expected: "ipad"
Received: "mac"

  74 |         // little slow (especially on overloaded CI servers)
  75 |         await retry(async () => {
> 76 |           expect(await browser.elementByCss('p').text()).toBe('ipad')
     |                                                          ^
  77 |         }, 5000 /* ms */)
  78 |
  79 |         expect(await browser.eval('window.__TEST_NO_RELOAD === true')).toBe(

  at toBe (development/app-hmr/hmr.test.ts:76:58)
  at retry (lib/next-test-utils.ts:831:14)
  at development/app-hmr/hmr.test.ts:75:9
  at NextDevInstance.patchFile (lib/next-modes/base.ts:729:9)
  at NextDevInstance.patchFile (lib/next-modes/next-dev.ts:303:16)
  at Object.<anonymous> (development/app-hmr/hmr.test.ts:70:7)

nextjs-bot · 2026-02-06T03:37:57Z

Stats from current PR

🔴 1 regression

Metric	Canary	PR	Change	Trend
node_modules Size	472 MB	472 MB	🔴 +313 kB (+0%)	▁████

📊 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	456ms	✓	▁▁▁▁▁
Cold (Ready in log)	437ms	437ms	✓	▁▂▂▂▁
Cold (First Request)	1.253s	1.237s	✓	▄▅▄▃▄
Warm (Listen)	457ms	457ms	✓	▁▁▁▁▁
Warm (Ready in log)	441ms	442ms	✓	▁▁▁▂▁
Warm (First Request)	342ms	341ms	✓	▂▂▁▃▁

📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	457ms	456ms	✓	▁▁▁▁█
Cold (Ready in log)	441ms	441ms	✓	▃▂▃▂▅
Cold (First Request)	1.921s	1.976s	✓	▂▃▂▃█
Warm (Listen)	457ms	456ms	✓	▁▁▁▁█
Warm (Ready in log)	441ms	441ms	✓	▅▄▄▄█
Warm (First Request)	1.949s	1.981s	✓	▂▂▂▃▇

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	3.933s	3.943s	✓	▁▁▁▄▁
Cached Build	4.048s	4.006s	✓	▁▁▁▄▁

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	13.950s	14.264s	✓	▁▂▁▁▇
Cached Build	14.062s	14.335s	✓	▁▂▁▂▇
node_modules Size	472 MB	472 MB	🔴 +313 kB (+0%)	▁████

📦 Bundle Sizes

Bundle Sizes

⚡ Turbopack

Client

Main Bundles: **397 kB** → **397 kB** ⚠️ +13 B

80 files with content-based hashes (individual files not comparable between builds)

Server

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	757 B	763 B	✓
Total	757 B	763 B	⚠️ +6 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	452 B	449 B	✓
Total	452 B	449 B	✅ -3 B

📦 Webpack

Client

Main Bundles

	Canary	PR	Change
5528-HASH.js gzip	5.47 kB	N/A	-
6280-HASH.js gzip	57.1 kB	N/A	-
6335.HASH.js gzip	169 B	N/A	-
912-HASH.js gzip	4.53 kB	N/A	-
e8aec2e4-HASH.js gzip	62.6 kB	N/A	-
framework-HASH.js gzip	59.7 kB	59.7 kB	✓
main-app-HASH.js gzip	255 B	251 B	🟢 4 B (-2%)
main-HASH.js gzip	39.1 kB	38.7 kB	🟢 440 B (-1%)
webpack-HASH.js gzip	1.68 kB	1.68 kB	✓
262-HASH.js gzip	N/A	4.52 kB	-
2889.HASH.js gzip	N/A	163 B	-
5602-HASH.js gzip	N/A	5.47 kB	-
6948ada0-HASH.js gzip	N/A	62.6 kB	-
9544-HASH.js gzip	N/A	54.7 kB	-
Total	231 kB	228 kB	✅ -2.81 kB

Polyfills

	Canary	PR	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Total	39.4 kB	39.4 kB	✓

Pages

	Canary	PR	Change
_app-HASH.js gzip	194 B	191 B	🟢 3 B (-2%)
_error-HASH.js gzip	183 B	177 B	🟢 6 B (-3%)
css-HASH.js gzip	331 B	330 B	✓
dynamic-HASH.js gzip	1.81 kB	1.8 kB	✓
edge-ssr-HASH.js gzip	256 B	254 B	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	384 B	382 B	✓
image-HASH.js gzip	580 B	578 B	✓
index-HASH.js gzip	260 B	258 B	✓
link-HASH.js gzip	2.5 kB	2.49 kB	✓
routerDirect..HASH.js gzip	320 B	318 B	✓
script-HASH.js gzip	386 B	385 B	✓
withRouter-HASH.js gzip	315 B	314 B	✓
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Total	7.97 kB	7.93 kB	✅ -36 B

Server

Edge SSR

	Canary	PR	Change
edge-ssr.js gzip	126 kB	125 kB	✓
page.js gzip	249 kB	244 kB	🟢 5 kB (-2%)
Total	374 kB	369 kB	✅ -5.78 kB

Middleware

	Canary	PR	Change
middleware-b..fest.js gzip	616 B	615 B	✓
middleware-r..fest.js gzip	156 B	156 B	✓
middleware.js gzip	43.6 kB	43.5 kB	✓
edge-runtime..pack.js gzip	842 B	842 B	✓
Total	45.2 kB	45.1 kB	✅ -126 B

Build Details

Build Manifests

	Canary	PR	Change
_buildManifest.js gzip	715 B	716 B	✓
Total	715 B	716 B	⚠️ +1 B

Build Cache

	Canary	PR	Change
0.pack gzip	3.87 MB	3.85 MB	🟢 19.4 kB (-1%)
index.pack gzip	103 kB	103 kB	✓
index.pack.old gzip	102 kB	103 kB	✓
Total	4.07 MB	4.05 MB	✅ -19.6 kB

🔄 Shared (bundler-independent)

Runtimes

	Canary	PR	Change
app-page-exp...dev.js gzip	316 kB	316 kB	✓
app-page-exp..prod.js gzip	167 kB	167 kB	✓
app-page-tur...dev.js gzip	315 kB	315 kB	✓
app-page-tur..prod.js gzip	167 kB	167 kB	✓
app-page-tur...dev.js gzip	312 kB	312 kB	✓
app-page-tur..prod.js gzip	165 kB	165 kB	✓
app-page.run...dev.js gzip	312 kB	312 kB	✓
app-page.run..prod.js gzip	165 kB	165 kB	✓
app-route-ex...dev.js gzip	70.5 kB	70.5 kB	✓
app-route-ex..prod.js gzip	49 kB	49 kB	✓
app-route-tu...dev.js gzip	70.5 kB	70.5 kB	✓
app-route-tu..prod.js gzip	49 kB	49 kB	✓
app-route-tu...dev.js gzip	70.1 kB	70.1 kB	✓
app-route-tu..prod.js gzip	48.8 kB	48.8 kB	✓
app-route.ru...dev.js gzip	70.1 kB	70.1 kB	✓
app-route.ru..prod.js gzip	48.7 kB	48.7 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	43.2 kB	43.2 kB	✓
pages-api-tu..prod.js gzip	32.9 kB	32.9 kB	✓
pages-api.ru...dev.js gzip	43.2 kB	43.2 kB	✓
pages-api.ru..prod.js gzip	32.8 kB	32.8 kB	✓
pages-turbo....dev.js gzip	52.5 kB	52.5 kB	✓
pages-turbo...prod.js gzip	38.4 kB	38.4 kB	✓
pages.runtim...dev.js gzip	52.5 kB	52.5 kB	✓
pages.runtim..prod.js gzip	38.4 kB	38.4 kB	✓
server.runti..prod.js gzip	63.5 kB	63.5 kB	✓
Total	2.8 MB	2.8 MB	⚠️ +21 B

📝 Changed Files (4 files)

Files with changes:

app-page-exp..ntime.dev.js
app-page-tur..ntime.dev.js
app-page-tur..ntime.dev.js
app-page.runtime.dev.js

View diffs

app-page-exp..ntime.dev.js

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app-page-tur..ntime.dev.js

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app-page-tur..ntime.dev.js

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app-page.runtime.dev.js

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Netail · 2026-02-06T08:57:29Z

Will also fix #72846 (hopefully), in favour of: #70087.
As an actually fix was done in Webpack 5.100.2.

I also tried to make an attempt: #81685 (in case you need inspiration)

…ents During HMR, the dev server sends BUILT (triggering async module.hot.apply()) before SERVER_COMPONENT_CHANGES (triggering hmrRefresh()). Previously, hmrRefresh() fired immediately without waiting for the webpack update to finish, creating a race where __webpack_require__ could be called for modules that were temporarily absent from __webpack_modules__ during the swap. This was previously masked because the resulting TypeError was caught by React's error boundary, but webpack 5.104+ added an explicit module existence check that turns this into a hard "Cannot find module" error. Fix by awaiting the pendingHotUpdateWebpack promise before calling hmrRefresh(), ensuring all webpack modules are fully in place before the RSC response tries to reference them.

nextjs-bot added created-by: Turbopack team PRs by the Turbopack team. type: next labels Feb 6, 2026

lukesandberg changed the title ~~bump the webpack version bundled in next~~ Update the webpack version bundled in next Feb 6, 2026

lukesandberg force-pushed the bump_webpack_version branch 2 times, most recently from 342ce8b to 929239e Compare February 9, 2026 20:37

nextjs-bot added Documentation Related to Next.js' official documentation. tests labels Feb 9, 2026

lukesandberg force-pushed the bump_webpack_version branch from 929239e to 9e9cb6f Compare February 9, 2026 21:56

Netail mentioned this pull request Feb 11, 2026

bump webpack (fix css sideEffects order) #81685

Open

lukesandberg force-pushed the bump_webpack_version branch from 9e9cb6f to 0ce5372 Compare February 13, 2026 23:57

lukesandberg added 3 commits February 14, 2026 15:16

bump the webpack version bundled in next

fc03aef

update the config key to address an issue

4b217d3

lukesandberg force-pushed the bump_webpack_version branch from 4082f78 to 2608499 Compare February 16, 2026 23:18

lukesandberg mentioned this pull request Feb 19, 2026

#20221 module existence check breaks interceptModuleExecution recovery for missing modules webpack/webpack#20475

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Update the webpack version bundled in next#89569

Update the webpack version bundled in next#89569
lukesandberg wants to merge 3 commits intocanaryfrom
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⚡ Dev Server

📦 Dev Server (Webpack)

⚡ Production Builds

📦 Production Builds (Webpack)

Bundle Sizes

⚡ Turbopack

📦 Webpack

🔄 Shared (bundler-independent)

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lukesandberg commented Feb 6, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Upgrade webpack 5.98.0 → 5.105.0

Notable webpack changes

webpack-dev-server 5.2.0 → 5.2.3

HMR race condition fix

Known Breaking changes

Full changelogs

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lukesandberg commented Feb 6, 2026

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Stats from current PR

🔴 1 regression

⚡ Dev Server

📦 Dev Server (Webpack)

⚡ Production Builds

📦 Production Builds (Webpack)

Bundle Sizes

⚡ Turbopack

📦 Webpack

🔄 Shared (bundler-independent)

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