Update middleware eval checks: #30883
Optimize the SSR middleware runtime size: #30906
Improve error handling in the SSR middleware: #31057
Ensure decode error in minimal mode responds with 400 not 500: #31037
Update ServerlessPlugin to use chunkGraph: #31058
Fix custom 404 page when concurrentFeatures is enabled: #31059
Upgrade React alpha and experimental dependencies to latest: #31039
Change disabled SWC message to Log.info: #31091
Add render prop support to <Main>: #30156
Change .web extension of document page to part of path: #31116

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Last checked 2 Oct 2026, 11:00 UTC

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12.0.4

15 Nov 2021GitHub Release

Additional changes to review1Matched wording:renamedThese matches may be harmless in context. Expand to see the excerpts.

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docs: next-iron-session renamed to iron-session: #31292

Core Changes

Update middleware eval checks: #30883
Optimize the SSR middleware runtime size: #30906
Improve error handling in the SSR middleware: #31057
Ensure decode error in minimal mode responds with 400 not 500: #31037
Update ServerlessPlugin to use chunkGraph: #31058
Fix custom 404 page when concurrentFeatures is enabled: #31059
Upgrade React alpha and experimental dependencies to latest: #31039
Change disabled SWC message to Log.info: #31091
Add render prop support to <Main>: #30156
Change .web extension of document page to part of path: #31116

Enable code splitting for the web runtime build: #31090

Give priority to document.title over h1 when announcing page change: #31147

Add webpack5 namespace to fix type errors: #31140

Add warning when image has unused sizes prop: #31064

Add experimental next-swc jest transform: #30993

fix: support --cache-strategy ESLint argument (fixes #29926): #29928

fixes #31060: NullReferenceException: #31061

use loader-utils 2 for resolve-url-loader to fix ./data: urls in sass: #31134

Update reason message for isolatedModules and esModuleInterop: #31150

Add input/output test for 30091: #31166

Fix useId mismatches on hydration: #31102

Do not hide body when concurrentFeatures is enabled: #31187

Fix middleware i18n rewrites: #31174

next-swc: Add displayNameAndId of styled-components: #31189

Use require.resolve to detect "framework" packages (fix pnpm): #21048

Add all cases where webpack5 type is used: #31206

Add test for styled-components SWC transform disabled: #31214

Add initial standalone build handling: #31003

fix(middleware): expose CryptoKey and globalThis.CryptoKey: #31193

Disable styled-components displayName in production: #31216

fix(31013): add base path to preflight request url: #31101

share collections in middleware vm context: #31043

Support assetPrefix specific protocol: #31213

upgrade webpack: #31034

Update swc: #31233

run middleware parser handler only for middleware modules: #31219

Update swc minifier: #31242

Fix process.env overriden in web runtime: #31261

fix: replaced useless let: #31239

Experimental next/jest config helper: #31246

correctly assess node equality when nonce attribute is present: #27573

bugfix/i18n Do not support the second locale in the pathname: #31229

Fix typo in next build log: #31295

Ensure next/jest is published: #31296

Update swc for jsc.paths: #31290

next/jest: Ensure typeof window is not transformed in jsdom environment: #31304

Output where preference is saved: #31305

Upgrade webpack: #31313

Ensure asPath is correctly normalized in minimalMode with i18n: #31281

Automatically using different port to start dev server for non-explicit port: #30736

Resolve stream piper on complete shell for renderToReadableStream: #31186

fix(middleware): fetch resource may be a URL instance (or any stringifiable value): #31260

Ensure NODE_ENV is replaced correctly with swc: #31274

Add support for jsxImportSource in tsconfig/jsconfig: #31358

fix(30724): clear "x-middleware-next" header when chaining middlewares: #30866

Add eslint rule to prevent importing next/server outside of _middleware: #30973

Don't proxy middleware if host is the same: #31180

Add support for legacy decorators through tsconfig/jsconfig: #31376

Update swc & fix styled-jsx: #31407

show (middleware only) when a middleware is added to the compiler: #31409

Add minify debug env var to investigate minifier bugs: #31417

add filename to babel warning about anonymous function default exports: #31322

Refactor server/render for SSR streaming: #31231

Remove moment locale replace from craCompat as it's a default in Next.js 12: #31431

Fix basePath replacing server-side and normalizeLocalePath() when path is empty string: #30978

Close stream when fatal error occurs: #31164

middleware: add request referrer support: #31343

Documentation Changes

Expands next/script documentation: #31063
Fix minor typos: #31161
Include www subdomain example in Domain Routing: #30487
Fix heading levels in URL imports docs.: #31163
Update upgrading.md: #31173
docs: fix typo in css-in-js page: #31244
Testing Docs: Add links to jump to sections: #31311
Changes in dev script (package.json): #31245
Typo fixes on Markdown files: #31380
Update data-fetching.md: #31394
Update image-optimization.md: #31401
Fix function syntax for API Routes documentation: #31414
docs: next-iron-session renamed to iron-session: #31292
Clarify with commas: #31224
docs(auth): fix iron-session example url + API: #31413

Example Changes

Optimise bundle size for with-supertokens example: #31040
Update remark and remark-html dependencies: #31051
Docs/examples/with iron session updates: #30956
Fix Auth0 Example: #31284
Updates with-supertokens example to add sign in with apple: #31200
Auth0 Example: getSession should be called with req and res: #31330
examples: fix README with google analytics: #31384
Add Playwright example: #29426
Fix storybook styled-jsx example with styled-jsx 5: #31357

Misc Changes

improve windows support for benchmark: #31032
Add integration test for Suspense and streaming: #31197
Bump cancel-workflow-action to 0.9.1: #31210
test: skip flaky dynamic import tests: #31221
Add integration test of API routes with concurrentFeatures enabled: #31227
Update contributing doc with trouble shooting section for swc: #31265
Fix test-pnp stalling in CI: #31282
Fix failed-loading-swc link in Troubleshooting: #31314
Maintain co-authors when kodiak merges: #31316
bugfix/second-locale-in-pathname remove console.log: #31289
Rewrite send-trace-to-jaeger in Rust: #31392
Ensure Git feature.manyFiles is enabled: #31408
Remove .only and ensure jest lint rules apply for all tests: #31456
Ensure swc dep is copied for isolated tests: #31462

Credits

Huge thanks to @javivelasco, @shuding, @rishabhpoddar, @chemicalkosek, @huozhi, @timneutkens, @devknoll, @sokra, @KittyGiraudel, @styfle, @padmaia, @housseindjirdeh, @OKinane, @KonstHardy, @BrandonRomano, @leerob, @furcan, @dusanralic, @kdy1, @elliottsj, @vvo, @Kikobeats, @hi-ogawa, @panva, @genetschneider, @thundermiracle, @stefano-rainieri, @ericbiewener, @vordgi, @stevejarvis, @ihmpavel, @ijjk, @delbaoliveira, @matamatanot, @dyarfaradj, @iheyunfei, @thibautsabot, @ascorbic, @fytriht, @emzoumpo, @onurtemiz, @a-ursino, @mxschmitt, @knezevicdev, @bywo, @OArnarsson, and @TurekBot for helping!

12.0.4#

Core Changes

12.0.4#

Core Changes

Documentation Changes

Example Changes

Misc Changes

Credits

12.0.4

12.0.4