update to webpack 5.50.0

[sokra]

• performance improvements for cache serialization
• disabled cache compression by default (next.js is using webpack default again)
• support hashbang

[styfle]

Nice!

Does this also solve the hashbang issue here? #27906

[sokra]

Does this also solve the hashbang issue here? #27906

yes

[sokra]

Maybe we can change the other PR to only add the test cases, which are good to have.

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
buildDuration	13.8s	13.7s	-141ms
buildDurationCached	3.2s	3.2s	⚠️ +17ms
nodeModulesSize	49.1 MB	49.1 MB	⚠️ +1.07 kB

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.482	2.509	⚠️ +0.03
/ avg req/sec	1007.36	996.51	⚠️ -10.85
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.405	1.445	⚠️ +0.04
/error-in-render avg req/sec	1778.88	1730.21	⚠️ -48.67

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
745.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42.2 kB	42.2 kB	✓
main-HASH.js gzip	23.1 kB	23.1 kB	✓
webpack-HASH.js gzip	1.5 kB	1.5 kB	✓
Overall change	67 kB	67 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
_app-HASH.js gzip	980 B	980 B	✓
_error-HASH.js gzip	194 B	194 B	✓
amp-HASH.js gzip	312 B	312 B	✓
css-HASH.js gzip	329 B	329 B	✓
dynamic-HASH.js gzip	2.52 kB	2.52 kB	✓
head-HASH.js gzip	350 B	350 B	✓
hooks-HASH.js gzip	904 B	904 B	✓
image-HASH.js gzip	4.12 kB	4.12 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	319 B	319 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	12.8 kB	12.8 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
_buildManifest.js gzip	490 B	490 B	✓
Overall change	490 B	490 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	523 B	523 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Webpack 4 Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
buildDuration	11.3s	11.5s	⚠️ +184ms
buildDurationCached	4.5s	4.7s	⚠️ +223ms
nodeModulesSize	49.1 MB	49.1 MB	⚠️ +1.07 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.464	2.44	-0.02
/ avg req/sec	1014.54	1024.47	+9.93
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.38	1.338	-0.04
/error-in-render avg req/sec	1811.59	1868.58	+56.99

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
17.HASH.js gzip	185 B	185 B	✓
677f882d2ed8..HASH.js gzip	14 kB	14 kB	✓
framework.HASH.js gzip	41.9 kB	41.9 kB	✓
main-HASH.js gzip	10.6 kB	10.6 kB	✓
webpack-HASH.js gzip	1.19 kB	1.19 kB	✓
Overall change	67.9 kB	67.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
_app-HASH.js gzip	965 B	965 B	✓
_error-HASH.js gzip	3.71 kB	3.71 kB	✓
amp-HASH.js gzip	552 B	552 B	✓
css-HASH.js gzip	333 B	333 B	✓
dynamic-HASH.js gzip	2.71 kB	2.71 kB	✓
head-HASH.js gzip	2.97 kB	2.97 kB	✓
hooks-HASH.js gzip	911 B	911 B	✓
index-HASH.js gzip	231 B	231 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	298 B	298 B	✓
script-HASH.js gzip	2.95 kB	2.95 kB	✓
withRouter-HASH.js gzip	294 B	294 B	✓
e025d2764813..52f.css gzip	125 B	125 B	✓
Overall change	17.7 kB	17.7 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
_buildManifest.js gzip	498 B	498 B	✓
Overall change	498 B	498 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js webpack/upgrade	Change
index.html gzip	577 B	577 B	✓
link.html gzip	589 B	589 B	✓
withRouter.html gzip	570 B	570 B	✓
Overall change	1.74 kB	1.74 kB	✓

Commit: c8f84ed