add native css nesting support

[jantimon]

today ~83% of all browsers support css nesting: https://caniuse.com/css-nesting

https://caniuse.com/css-nesting
https://developer.mozilla.org/en-US/docs/Web/CSS/Nesting_selector

therefore this pr upgrades postcss-modules-local-by-default which fixes a bug in css-modules/postcss-modules-local-by-default#64)

• .foo { &:hover { a_value: some-value; } } is pure
• .foo { html &:hover { a_value: some-value; } } is pure
• .foo { &:global(.bar) { a_value: some-value; } } is pure
• :global(.foo) { &:hover { a_value: some-value; } } is not pure

upgrading the package will allow using css nestings with or without postcss compilation

it fixes the following error:

CssSyntaxError: postcss-modules-local-by-default: <css input>:1:8: Selector "&:hover" is not pure (pure selectors must contain at least one local class or id)

Fixes #55053
Fixes #33734
Fixes #10475

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: 7fde8fa

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[ijjk]

Failing test suites

Commit: 7fde8fa

pnpm test-dev test/e2e/app-dir/metadata/metadata.test.ts (PPR)

• app dir - metadata > react cache > should have same title and page value when navigating

Expand output

● app dir - metadata › react cache › should have same title and page value when navigating

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

Expected: "0.5321066820078779"
Received: "0.328509971626608"

  973 |         const obj = JSON.parse(title)
  974 |         // Check `cache()`
> 975 |         expect(obj.val.toString()).toBe(value)
      |                                    ^
  976 |         // Check `fetch()`
  977 |         // TODO-APP: Investigate why fetch deduping doesn't apply but cache() does.
  978 |         if (!isNextDev) {

  at Object.toBe (e2e/app-dir/metadata/metadata.test.ts:975:36)

Read more about building and testing Next.js in contributing.md.

[ijjk]

Stats from current PR

Default Build

General

	vercel/next.js canary	jantimon/next.js allow-pure-nested-selectors	Change
buildDuration	13.9s	13.9s	N/A
buildDurationCached	8.5s	6.5s	N/A
nodeModulesSize	198 MB	198 MB	✓
nextStartRea..uration (ms)	429ms	411ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	jantimon/next.js allow-pure-nested-selectors	Change
2453-HASH.js gzip	30.4 kB	30.4 kB	N/A
3304.HASH.js gzip	181 B	181 B	✓
3f784ff6-HASH.js gzip	53.7 kB	53.7 kB	N/A
8299-HASH.js gzip	5.04 kB	5.04 kB	N/A
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	242 B	241 B	N/A
main-HASH.js gzip	32.2 kB	32.2 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	N/A
Overall change	45.4 kB	45.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	jantimon/next.js allow-pure-nested-selectors	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

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1afbb74e6ecf..834.css gzip	106 B	106 B	✓
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Client Build Manifests

	vercel/next.js canary	jantimon/next.js allow-pure-nested-selectors	Change
_buildManifest.js gzip	483 B	485 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	jantimon/next.js allow-pure-nested-selectors	Change
index.html gzip	529 B	526 B	N/A
link.html gzip	542 B	539 B	N/A
withRouter.html gzip	524 B	521 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

	vercel/next.js canary	jantimon/next.js allow-pure-nested-selectors	Change
edge-ssr.js gzip	95 kB	95 kB	N/A
page.js gzip	3.06 kB	3.07 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

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middleware-b..fest.js gzip	624 B	623 B	N/A
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middleware.js gzip	25.5 kB	25.5 kB	N/A
edge-runtime..pack.js gzip	839 B	839 B	✓
Overall change	990 B	990 B	✓

Next Runtimes

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app-page-exp...dev.js gzip	171 kB	171 kB	✓
app-page-exp..prod.js gzip	96.7 kB	96.7 kB	✓
app-page-tur..prod.js gzip	98.5 kB	98.5 kB	✓
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app-page.run...dev.js gzip	150 kB	150 kB	✓
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app-route-ex...dev.js gzip	21.3 kB	21.3 kB	✓
app-route-ex..prod.js gzip	15 kB	15 kB	✓
app-route-tu..prod.js gzip	15 kB	15 kB	✓
app-route-tu..prod.js gzip	14.8 kB	14.8 kB	✓
app-route.ru...dev.js gzip	20.9 kB	20.9 kB	✓
app-route.ru..prod.js gzip	14.8 kB	14.8 kB	✓
pages-api-tu..prod.js gzip	9.51 kB	9.51 kB	✓
pages-api.ru...dev.js gzip	9.79 kB	9.79 kB	✓
pages-api.ru..prod.js gzip	9.51 kB	9.51 kB	✓
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pages.runtim..prod.js gzip	22.3 kB	22.3 kB	✓
server.runti..prod.js gzip	50.6 kB	50.6 kB	✓
Overall change	950 kB	950 kB	✓

build cache

	vercel/next.js canary	jantimon/next.js allow-pure-nested-selectors	Change
0.pack gzip	1.56 MB	1.56 MB	N/A
index.pack gzip	105 kB	105 kB	N/A
Overall change	0 B	0 B	✓

Diff details

Diff for middleware.js

Diff too large to display

Commit: bacff20

[samcx]

Thank you for submitting a !

[jantimon]

thanks for merging

[legowerewolf]

Woo!