RSC: handle commonjs in flight loader

[huozhi]

We need to handle cjs cases for client/server components when they're compiled to commonjs in some cases.
e.g. if there's an internal _app.server.js in nextjs, the assets in the dist files are compiled to cjs by swc. Or any 3rd party libraries are consumed could be cjs only.

How it works

• Detect the source file is ESM or CJS first by detect if there's any ESM import/export
• Append the new exports or collect exports info based on the module type

[ijjk]

Stats from current PR

Default Build (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
buildDuration	15.3s	15.7s	⚠️ +395ms
buildDurationCached	6.1s	6s	-37ms
nodeModulesSize	467 MB	467 MB	⚠️ +3.33 kB

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.898	2.948	⚠️ +0.05
/ avg req/sec	862.6	847.94	⚠️ -14.66
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.172	1.174	0
/error-in-render avg req/sec	2133.68	2129.81	⚠️ -3.87

Client Bundles (main, webpack)

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
925.HASH.js gzip	179 B	179 B	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	27.9 kB	27.9 kB	✓
webpack-HASH.js gzip	1.44 kB	1.44 kB	✓
Overall change	71.6 kB	71.6 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
_app-HASH.js gzip	1.36 kB	1.36 kB	✓
_error-HASH.js gzip	192 B	192 B	✓
amp-HASH.js gzip	309 B	309 B	✓
css-HASH.js gzip	327 B	327 B	✓
dynamic-HASH.js gzip	2.57 kB	2.57 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	920 B	920 B	✓
image-HASH.js gzip	5.48 kB	5.48 kB	✓
index-HASH.js gzip	263 B	263 B	✓
link-HASH.js gzip	2.26 kB	2.26 kB	✓
routerDirect..HASH.js gzip	320 B	320 B	✓
script-HASH.js gzip	387 B	387 B	✓
withRouter-HASH.js gzip	319 B	319 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.2 kB	15.2 kB	✓

Client Build Manifests

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
_buildManifest.js gzip	460 B	460 B	✓
Overall change	460 B	460 B	✓

Rendered Page Sizes

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
index.html gzip	532 B	532 B	✓
link.html gzip	546 B	546 B	✓
withRouter.html gzip	526 B	526 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Default Build with SWC (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
buildDuration	18.8s	18.9s	⚠️ +155ms
buildDurationCached	6.1s	6s	-75ms
nodeModulesSize	467 MB	467 MB	⚠️ +3.33 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.949	2.93	-0.02
/ avg req/sec	847.66	853.32	+5.66
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.187	1.183	0
/error-in-render avg req/sec	2106.19	2113.39	+7.2

Client Bundles (main, webpack)

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
925.HASH.js gzip	178 B	178 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	1.45 kB	1.45 kB	✓
Overall change	72.1 kB	72.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
_app-HASH.js gzip	1.35 kB	1.35 kB	✓
_error-HASH.js gzip	179 B	179 B	✓
amp-HASH.js gzip	313 B	313 B	✓
css-HASH.js gzip	324 B	324 B	✓
dynamic-HASH.js gzip	2.56 kB	2.56 kB	✓
head-HASH.js gzip	351 B	351 B	✓
hooks-HASH.js gzip	921 B	921 B	✓
image-HASH.js gzip	5.59 kB	5.59 kB	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	2.33 kB	2.33 kB	✓
routerDirect..HASH.js gzip	322 B	322 B	✓
script-HASH.js gzip	388 B	388 B	✓
withRouter-HASH.js gzip	317 B	317 B	✓
85e02e95b279..7e3.css gzip	107 B	107 B	✓
Overall change	15.3 kB	15.3 kB	✓

Client Build Manifests

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
_buildManifest.js gzip	458 B	458 B	✓
Overall change	458 B	458 B	✓

Rendered Page Sizes

	vercel/next.js canary	huozhi/next.js rsc/loader-cjs	Change
index.html gzip	531 B	531 B	✓
link.html gzip	545 B	545 B	✓
withRouter.html gzip	527 B	527 B	✓
Overall change	1.6 kB	1.6 kB	✓

Commit: 6c8e8ce