Turbopack: uncell RequireContextValue

[mischnic]

This might make a difference if the RequireContextMap is huge and used across many files

More importantly, this seems to solve this failure in the testing backend on #75440:

called 'Result::unwrap()' on an 'Err' value: Cell is empty
Stack backtrace:
0: <anyhow::Error>::msg::<&str>
1: <turbo_tasks::backend::TypedCellContent>::cast::<turbopack_emascript::analyzer::RequireContextValue>
2: <turbo_tasks::vc::read::ReadVcFuture<turbopack_ecmascript::analyzer::RequireContextValue> as core::future::future::Future>::poll
3: turbopack_ecmascript::analyzer::well_known::replace_well_known::{closure#0}
4: turbopack_ecmascript::analyzer::linker::visit::<mod::analyzer::bench_link::{closure#0}::{closure#0}::{closure#0}::{closure#0}, turbopack_emascript: analyzer: it {closure#0}>::{closure#0}

Closes PACK-3898

[mischnic]

• Turbopack: lazily evaluate obj for member replacements #75453
• Turbopack: cache variables in linker #75440
• Turbopack: uncell RequireContextValue #75683 👈 (View in Graphite)
• canary

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[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
buildDuration	18.2s	15.4s	N/A
buildDurationCached	14.6s	12.3s	N/A
nodeModulesSize	392 MB	392 MB	✓
nextStartRea..uration (ms)	399ms	425ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
5306-HASH.js gzip	54 kB	54 kB	N/A
8276.HASH.js gzip	169 B	168 B	N/A
8377-HASH.js gzip	5.46 kB	5.46 kB	N/A
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main-app-HASH.js gzip	240 B	242 B	N/A
main-HASH.js gzip	34.5 kB	34.5 kB	N/A
webpack-HASH.js gzip	1.71 kB	1.71 kB	N/A
Overall change	0 B	0 B	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

Client Pages

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amp-HASH.js gzip	512 B	510 B	N/A
css-HASH.js gzip	343 B	342 B	N/A
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hooks-HASH.js gzip	393 B	392 B	N/A
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withRouter-HASH.js gzip	323 B	326 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.59 kB	3.59 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
_buildManifest.js gzip	748 B	747 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
index.html gzip	525 B	524 B	N/A
link.html gzip	539 B	538 B	N/A
withRouter.html gzip	520 B	520 B	✓
Overall change	520 B	520 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
edge-ssr.js gzip	130 kB	130 kB	N/A
page.js gzip	210 kB	210 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
middleware-b..fest.js gzip	675 B	673 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	31.3 kB	31.3 kB	N/A
edge-runtime..pack.js gzip	844 B	844 B	✓
Overall change	844 B	844 B	✓

Next Runtimes

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app-page-exp...dev.js gzip	393 kB	393 kB	✓
app-page-exp..prod.js gzip	132 kB	132 kB	✓
app-page-tur..prod.js gzip	145 kB	145 kB	✓
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app-page.run..prod.js gzip	128 kB	128 kB	✓
app-route-ex...dev.js gzip	39.3 kB	39.3 kB	✓
app-route-ex..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.6 kB	25.6 kB	✓
app-route-tu..prod.js gzip	25.4 kB	25.4 kB	✓
app-route.ru...dev.js gzip	40.8 kB	40.8 kB	✓
app-route.ru..prod.js gzip	25.4 kB	25.4 kB	✓
dist_client_...dev.js gzip	356 B	356 B	✓
dist_client_...dev.js gzip	349 B	349 B	✓
pages-api-tu..prod.js gzip	9.69 kB	9.69 kB	✓
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pages-api.ru..prod.js gzip	9.68 kB	9.68 kB	✓
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pages.runtim...dev.js gzip	31.5 kB	31.5 kB	✓
pages.runtim..prod.js gzip	21.9 kB	21.9 kB	✓
server.runti..prod.js gzip	60.5 kB	60.5 kB	✓
Overall change	1.67 MB	1.67 MB	✓

build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js mischnic/uncell-require-context-value	Change
0.pack gzip	2.1 MB	2.11 MB	⚠️ +3.11 kB
index.pack gzip	74.9 kB	75 kB	⚠️ +108 B
Overall change	2.18 MB	2.18 MB	⚠️ +3.22 kB

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Commit: 1a56a14