Fix redundant styled-jsx global issue

[padmaia]

Fixes vercel/styled-jsx#756

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see contributing.md

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.
• Errors have helpful link attached, see contributing.md

Documentation / Examples

• Make sure the linting passes by running yarn lint

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
buildDuration	22.3s	22.6s	⚠️ +285ms
buildDurationCached	4.6s	4.6s	-57ms
nodeModulesSize	198 MB	199 MB	⚠️ +138 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
/ failed reqs	0	0	✓
/ total time (seconds)	4.232	4.007	-0.23
/ avg req/sec	590.68	623.96	+33.28
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	2.165	2.094	-0.07
/error-in-render avg req/sec	1154.73	1193.77	+39.04

Client Bundles (main, webpack, commons)

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	28 kB	28 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	71.9 kB	71.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
_app-HASH.js gzip	1.23 kB	1.23 kB	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.38 kB	2.38 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	635 B	635 B	✓
image-HASH.js gzip	4.44 kB	4.44 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	1.87 kB	1.87 kB	✓
routerDirect..HASH.js gzip	321 B	321 B	✓
script-HASH.js gzip	383 B	383 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
334f979574ae..6f4.css gzip	106 B	106 B	✓
Overall change	13.1 kB	13.1 kB	✓

Client Build Manifests

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
index.html gzip	533 B	533 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.61 kB	1.61 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
buildDuration	19.8s	19s	-780ms
buildDurationCached	4.7s	4.6s	-125ms
nodeModulesSize	198 MB	199 MB	⚠️ +138 kB

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.934	3.988	⚠️ +0.05
/ avg req/sec	635.42	626.93	⚠️ -8.49
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	2.017	2.247	⚠️ +0.23
/error-in-render avg req/sec	1239.21	1112.35	⚠️ -126.86

Client Bundles (main, webpack, commons)

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.2 kB	28.2 kB	✓
webpack-HASH.js gzip	1.43 kB	1.43 kB	✓
Overall change	72.1 kB	72.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
_app-HASH.js gzip	1.22 kB	1.22 kB	✓
_error-HASH.js gzip	180 B	180 B	✓
amp-HASH.js gzip	305 B	305 B	✓
css-HASH.js gzip	321 B	321 B	✓
dynamic-HASH.js gzip	2.38 kB	2.38 kB	✓
head-HASH.js gzip	342 B	342 B	✓
hooks-HASH.js gzip	622 B	622 B	✓
image-HASH.js gzip	4.46 kB	4.46 kB	✓
index-HASH.js gzip	256 B	256 B	✓
link-HASH.js gzip	1.91 kB	1.91 kB	✓
routerDirect..HASH.js gzip	314 B	314 B	✓
script-HASH.js gzip	375 B	375 B	✓
withRouter-HASH.js gzip	309 B	309 B	✓
334f979574ae..6f4.css gzip	106 B	106 B	✓
Overall change	13.1 kB	13.1 kB	✓

Client Build Manifests

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	padmaia/next.js fix/styled-jsx-double-global	Change
index.html gzip	534 B	534 B	✓
link.html gzip	548 B	548 B	✓
withRouter.html gzip	528 B	528 B	✓
Overall change	1.61 kB	1.61 kB	✓

Commit: 571ed3c