Lazily init getStaticPathsWorker

[timneutkens]

Shaves off ~25ms during bootup when getStaticPaths is not used in the app.

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/initialize-staticpaths-worker-lazy	Change
buildDuration	17.3s	17.3s	⚠️ +3ms
buildDurationCached	3.5s	3.4s	-118ms
nodeModulesSize	339 MB	339 MB	⚠️ +383 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.885	2.852	-0.03
/ avg req/sec	866.66	876.55	+9.89
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.34	1.294	-0.05
/error-in-render avg req/sec	1865.95	1932.4	+66.45

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	28.4 kB	28.4 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	72.2 kB	72.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	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/initialize-staticpaths-worker-lazy	Change
_app-HASH.js gzip	1.37 kB	1.37 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	4.45 kB	4.45 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	13.3 kB	13.3 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	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/initialize-staticpaths-worker-lazy	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	Change
buildDuration	18.4s	18.8s	⚠️ +425ms
buildDurationCached	3.6s	3.6s	⚠️ +2ms
nodeModulesSize	339 MB	339 MB	⚠️ +383 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.904	2.842	-0.06
/ avg req/sec	860.85	879.63	+18.78
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.317	1.346	⚠️ +0.03
/error-in-render avg req/sec	1898.12	1857.99	⚠️ -40.13

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	Change
450.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.3 kB	42.3 kB	✓
main-HASH.js gzip	28.6 kB	28.6 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	72.5 kB	72.5 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	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/initialize-staticpaths-worker-lazy	Change
_app-HASH.js gzip	1.35 kB	1.35 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	4.47 kB	4.47 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	13.2 kB	13.2 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js add/initialize-staticpaths-worker-lazy	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/initialize-staticpaths-worker-lazy	Change
index.html gzip	532 B	532 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: 99b1213