perf: Make barrel optimizer use Atom instead of String

[kdy1]

What?

Use swc_atoms::Atom instead of String in next-swc.

Why?

Atom does not allocate if another instance has the same value, meaning that clone() is a single atomic operation. But String allocates regardless of any other occurrence.

Closes PACK-3884

[kdy1]

• perf: Make page static info use Atom instead of String #75596
• perf: Make page exports stripper use Atom instead of String #75595
• perf: Make server action pass use Atom instead of String #75594
• perf: Make RSC pass use Atom instead of String #75593
• perf: Make barrel optimizer use Atom instead of String #75592 👈 (View in Graphite)
• perf: Make next_ssg use Atom instead of String #75591
• canary

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[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js kdy1/next-swc-alloc-5	Change
buildDuration	20.3s	18.7s	N/A
buildDurationCached	17.9s	15s	N/A
nodeModulesSize	391 MB	391 MB	✓
nextStartRea..uration (ms)	501ms	486ms	N/A

Client Bundles (main, webpack)

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5306-HASH.js gzip	54 kB	54 kB	N/A
8276.HASH.js gzip	169 B	168 B	N/A
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webpack-HASH.js gzip	1.71 kB	1.71 kB	N/A
Overall change	0 B	0 B	✓

Legacy Client Bundles (polyfills)

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polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

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Client Build Manifests

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_buildManifest.js gzip	748 B	747 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

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index.html gzip	524 B	524 B	✓
link.html gzip	539 B	538 B	N/A
withRouter.html gzip	520 B	520 B	✓
Overall change	1.04 kB	1.04 kB	✓

Edge SSR bundle Size

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edge-ssr.js gzip	129 kB	129 kB	N/A
page.js gzip	210 kB	210 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

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middleware-b..fest.js gzip	670 B	666 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..prod.js gzip	132 kB	132 kB	✓
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app-route-ex..prod.js gzip	25.6 kB	25.6 kB	✓
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pages.runtim..prod.js gzip	21.9 kB	21.9 kB	✓
server.runti..prod.js gzip	60.2 kB	60.2 kB	✓
Overall change	1.65 MB	1.65 MB	✓

build cache Overall increase ⚠️

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0.pack gzip	2.1 MB	2.11 MB	⚠️ +3.68 kB
index.pack gzip	76.2 kB	75.3 kB	N/A
Overall change	2.1 MB	2.11 MB	⚠️ +3.68 kB

Diff details

Diff for main-HASH.js

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Commit: f6c9eaf

[graphite-app]

Merge activity

• Feb 4, 10:59 PM GMT+9: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..