Telemetry: track usage of 'experimental/nextScriptWorkers'

[housseindjirdeh]

Track usage of the experimental nextScriptWorkers flag.

Backend PR: https://github.com/vercel/next-telemetry/pull/75

https://nextjs.org/docs/basic-features/script#off-loading-scripts-to-a-web-worker-experimental

[ijjk]

Failing test suites

Commit: a59deda

yarn testheadless test/integration/telemetry/test/index.test.js

• Telemetry CLI > emits telemetry for usage of swc
• Telemetry CLI > emits telemetry for usage of nextScriptWorkers

Expand output

● Telemetry CLI › emits telemetry for usage of swc

ENOENT: no such file or directory, rename '/home/runner/work/next.js/next.js/test/integration/telemetry/next.config.swc' -> '/home/runner/work/next.js/next.js/test/integration/telemetry/next.config.js'

● Telemetry CLI › emits telemetry for usage of nextScriptWorkers

expect(received).toContain(expected) // indexOf

Expected substring: "\"featureName\": \"experimental/nextScriptWorkers\""
Received string:    "
    \"featureName\": \"experimental/optimizeCss\",
    \"invocationCount\": 0
  "

  783 |     regex.exec(stderr).pop() // build-lint
  784 |     const nextScriptWorkers = regex.exec(stderr).pop()
> 785 |     expect(nextScriptWorkers).toContain(
      |                               ^
  786 |       `"featureName": "experimental/nextScriptWorkers"`
  787 |     )
  788 |     expect(nextScriptWorkers).toContain(`"invocationCount": 1`)

  at Object.<anonymous> (integration/telemetry/test/index.test.js:785:31)

Read more about building and testing Next.js in contributing.md.

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
buildDuration	18.2s	18.3s	⚠️ +139ms
buildDurationCached	7.3s	7.2s	-38ms
nodeModulesSize	475 MB	475 MB	⚠️ +337 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
/ failed reqs	0	0	✓
/ total time (seconds)	4.554	4.562	⚠️ +0.01
/ avg req/sec	549.01	547.95	⚠️ -1.06
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.55	1.544	-0.01
/error-in-render avg req/sec	1613.14	1619.42	+6.28

Client Bundles (main, webpack)

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	28.8 kB	28.8 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	housseindjirdeh/next.js telemetry-next-script-workers	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	193 B	193 B	✓
amp-HASH.js gzip	308 B	308 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.69 kB	2.69 kB	✓
head-HASH.js gzip	359 B	359 B	✓
hooks-HASH.js gzip	920 B	920 B	✓
image-HASH.js gzip	5.7 kB	5.7 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.64 kB	2.64 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	391 B	391 B	✓
withRouter-HASH.js gzip	318 B	318 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.9 kB	15.9 kB	✓

Client Build Manifests

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
_buildManifest.js gzip	459 B	459 B	✓
Overall change	459 B	459 B	✓

Rendered Page Sizes

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
index.html gzip	532 B	532 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
buildDuration	20.2s	19.8s	-458ms
buildDurationCached	7s	7.2s	⚠️ +151ms
nodeModulesSize	475 MB	475 MB	⚠️ +337 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
/ failed reqs	0	0	✓
/ total time (seconds)	4.575	4.585	⚠️ +0.01
/ avg req/sec	546.48	545.27	⚠️ -1.21
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.514	1.597	⚠️ +0.08
/error-in-render avg req/sec	1650.72	1565.51	⚠️ -85.21

Client Bundles (main, webpack)

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
925.HASH.js gzip	178 B	178 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	29.2 kB	29.2 kB	✓
webpack-HASH.js gzip	1.45 kB	1.45 kB	✓
Overall change	73.1 kB	73.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	179 B	179 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	324 B	324 B	✓
dynamic-HASH.js gzip	2.71 kB	2.71 kB	✓
head-HASH.js gzip	357 B	357 B	✓
hooks-HASH.js gzip	921 B	921 B	✓
image-HASH.js gzip	5.79 kB	5.79 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	2.76 kB	2.76 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
script-HASH.js gzip	392 B	392 B	✓
withRouter-HASH.js gzip	317 B	317 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	16.1 kB	16.1 kB	✓

Client Build Manifests

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
_buildManifest.js gzip	456 B	456 B	✓
Overall change	456 B	456 B	✓

Rendered Page Sizes

	vercel/next.js canary	housseindjirdeh/next.js telemetry-next-script-workers	Change
index.html gzip	530 B	530 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: b49dd01