Disable styled-components displayName in production

[timneutkens]

This makes more sense as a default for production given that displayName is stripped for other components too.

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	timneutkens/next.js add/disable-displayname-in-prod	Change
buildDuration	21.1s	20.9s	-166ms
buildDurationCached	4.3s	4.2s	-34ms
nodeModulesSize	333 MB	333 MB	⚠️ +93 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.451	3.442	-0.01
/ avg req/sec	724.47	726.34	+1.87
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.629	1.611	-0.02
/error-in-render avg req/sec	1534.76	1552.04	+17.28

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	28.1 kB	28.1 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	timneutkens/next.js add/disable-displayname-in-prod	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	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	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	13.1 kB	13.1 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
index.html gzip	524 B	524 B	✓
link.html gzip	536 B	536 B	✓
withRouter.html gzip	517 B	517 B	✓
Overall change	1.58 kB	1.58 kB	✓

---

Default Build with SWC (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
buildDuration	22.6s	22.9s	⚠️ +276ms
buildDurationCached	4.3s	4.3s	-25ms
nodeModulesSize	333 MB	333 MB	⚠️ +93 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
/ failed reqs	0	0	✓
/ total time (seconds)	3.493	3.485	-0.01
/ avg req/sec	715.81	717.33	+1.52
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.676	1.578	-0.1
/error-in-render avg req/sec	1491.94	1584.54	+92.6

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	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	timneutkens/next.js add/disable-displayname-in-prod	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	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	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	13.1 kB	13.1 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	timneutkens/next.js add/disable-displayname-in-prod	Change
index.html gzip	524 B	524 B	✓
link.html gzip	536 B	536 B	✓
withRouter.html gzip	517 B	517 B	✓
Overall change	1.58 kB	1.58 kB	✓

Commit: 5786fb6