Add middlewareCount info to build optimized

[ijjk]

This adds info on number of _middleware routes being used.

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 (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
buildDuration	12.4s	12s	-459ms
buildDurationCached	2.7s	2.8s	⚠️ +42ms
nodeModulesSize	196 MB	196 MB	⚠️ +262 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.831	2.859	⚠️ +0.03
/ avg req/sec	883.05	874.36	⚠️ -8.69
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.238	1.346	⚠️ +0.11
/error-in-render avg req/sec	2019.21	1857.53	⚠️ -161.68

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
651.cd440d20..0b23.js gzip	2.96 kB	2.96 kB	✓
831.695e33f6..205f.js gzip	179 B	179 B	✓
framework-89..a097.js gzip	42.2 kB	42.2 kB	✓
main-167207f..648c.js gzip	26.1 kB	26.1 kB	✓
webpack-f09b..493e.js gzip	1.47 kB	1.47 kB	✓
Overall change	72.9 kB	72.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
_app-9fb8765..c13d.js gzip	979 B	979 B	✓
_error-d828d..2954.js gzip	3.06 kB	3.06 kB	✓
amp-5388d1f5..4ce9.js gzip	551 B	551 B	✓
css-10424225..367a.js gzip	329 B	329 B	✓
dynamic-9821..3cd4.js gzip	2.67 kB	2.67 kB	✓
head-1df323b..d261.js gzip	2.32 kB	2.32 kB	✓
hooks-ab0016..b093.js gzip	917 B	917 B	✓
image-a30860..3c27.js gzip	5.85 kB	5.85 kB	✓
index-95c8cb..6970.js gzip	260 B	260 B	✓
link-05c99e7..35ec.js gzip	1.66 kB	1.66 kB	✓
routerDirect..6659.js gzip	319 B	319 B	✓
script-d94ba..ed05.js gzip	386 B	386 B	✓
withRouter-7..8b2e.js gzip	317 B	317 B	✓
9a34b27eb3f9..27d.css gzip	125 B	125 B	✓
Overall change	19.7 kB	19.7 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
index.html gzip	537 B	537 B	✓
link.html gzip	548 B	548 B	✓
withRouter.html gzip	528 B	528 B	✓
Overall change	1.61 kB	1.61 kB	✓

---

Default Build with SWC (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
buildDuration	5.8s	6s	⚠️ +211ms
buildDurationCached	2.5s	2.7s	⚠️ +198ms
nodeModulesSize	196 MB	196 MB	⚠️ +262 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.6	2.836	⚠️ +0.24
/ avg req/sec	961.43	881.37	⚠️ -80.06
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.283	1.362	⚠️ +0.08
/error-in-render avg req/sec	1947.83	1836.14	⚠️ -111.69

Client Bundles (main, webpack, commons)

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
450.fd3ad245..022b.js gzip	179 B	179 B	✓
675-228d3e2f..0c27.js gzip	13.8 kB	13.8 kB	✓
framework-13..70b0.js gzip	50.8 kB	50.8 kB	✓
main-d78cd7f..aaf4.js gzip	36.5 kB	36.5 kB	✓
webpack-a7f2..2650.js gzip	1.63 kB	1.63 kB	✓
Overall change	103 kB	103 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
polyfills-a4..dd70.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
_app-ae91bc3..d985.js gzip	1.33 kB	1.33 kB	✓
_error-273ac..9ef0.js gzip	180 B	180 B	✓
amp-5f9a7694..99ce.js gzip	315 B	315 B	✓
css-3a1b2477..df1e.js gzip	330 B	330 B	✓
dynamic-e04a..a1b5.js gzip	2.79 kB	2.79 kB	✓
head-7f600d0..daa3.js gzip	356 B	356 B	✓
hooks-bd8c02..0730.js gzip	638 B	638 B	✓
image-6365b7..7506.js gzip	536 B	536 B	✓
index-80be94..e89f.js gzip	262 B	262 B	✓
link-4ee1ea7..8745.js gzip	2.22 kB	2.22 kB	✓
routerDirect..c4aa.js gzip	325 B	325 B	✓
script-67da0..49e6.js gzip	390 B	390 B	✓
withRouter-2..2409.js gzip	322 B	322 B	✓
9a34b27eb3f9..27d.css gzip	125 B	125 B	✓
Overall change	10.1 kB	10.1 kB	✓

Client Build Manifests

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
_buildManifest.js gzip	477 B	477 B	✓
Overall change	477 B	477 B	✓

Rendered Page Sizes

	vercel/next.js canary	ijjk/next.js add/middleware-info	Change
index.html gzip	535 B	535 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	528 B	528 B	✓
Overall change	1.61 kB	1.61 kB	✓

Commit: 4b6057e