Fix next/server api alias for ESM pkg

[huozhi]

What & Why

We have a modularize imports config for next/server before, which will transform the next/server imports to directly import from the actual file, for instance: import { NextRequest } from 'next/server' will become import { NextRequest } from 'next/dist/server/web/exports/next-request', where the NextRequest is exported as default export. This is fine in most case until you're using a ESM pkg, then it will be resolved as { default: NextRequest } according to the spec. Since it's a ESM import to a CJS module in next/dist.

Since we already have the ESM alias introduced in #59852 , this can handle the case more properly.

How

Remove the modularize imports config for next/server, use the ESM api alias instead.

Migrate the cjs optimizer tests from middleware to a separate endpoint /cjs/server. As now ESM imports for next/server are not going to get tree-shaken in dev, but since we don't have image response there it's still fine.

Closes NEXT-2376
Closes NEXT-2374

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
buildDuration	11.6s	11.7s	N/A
buildDurationCached	6s	5.3s	N/A
nodeModulesSize	196 MB	196 MB	N/A
nextStartRea..uration (ms)	430ms	427ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
3f784ff6-HASH.js gzip	53.4 kB	53.4 kB	✓
423.HASH.js gzip	185 B	181 B	N/A
68-HASH.js gzip	29.7 kB	29.7 kB	N/A
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	238 B	240 B	N/A
main-HASH.js gzip	31.8 kB	31.8 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	✓
Overall change	100 kB	100 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
_app-HASH.js gzip	194 B	195 B	N/A
_error-HASH.js gzip	182 B	181 B	N/A
amp-HASH.js gzip	502 B	501 B	N/A
css-HASH.js gzip	320 B	322 B	N/A
dynamic-HASH.js gzip	2.5 kB	2.5 kB	N/A
edge-ssr-HASH.js gzip	255 B	256 B	N/A
head-HASH.js gzip	350 B	349 B	N/A
hooks-HASH.js gzip	368 B	369 B	N/A
image-HASH.js gzip	4.19 kB	4.18 kB	N/A
index-HASH.js gzip	257 B	256 B	N/A
link-HASH.js gzip	2.61 kB	2.61 kB	N/A
routerDirect..HASH.js gzip	310 B	311 B	N/A
script-HASH.js gzip	384 B	383 B	N/A
withRouter-HASH.js gzip	306 B	308 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	106 B	106 B	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
_buildManifest.js gzip	483 B	484 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
index.html gzip	529 B	527 B	N/A
link.html gzip	541 B	538 B	N/A
withRouter.html gzip	524 B	522 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
edge-ssr.js gzip	94 kB	94 kB	N/A
page.js gzip	149 kB	149 kB	N/A
Overall change	0 B	0 B	✓

Middleware size Overall increase ⚠️

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
middleware-b..fest.js gzip	619 B	624 B	N/A
middleware-r..fest.js gzip	151 B	149 B	N/A
middleware.js gzip	37.7 kB	47.4 kB	⚠️ +9.65 kB
edge-runtime..pack.js gzip	1.92 kB	1.94 kB	N/A
Overall change	37.7 kB	47.4 kB	⚠️ +9.65 kB

Next Runtimes

	vercel/next.js canary	vercel/next.js fix/next-server-module-imports	Change
app-page-exp...dev.js gzip	166 kB	166 kB	✓
app-page-exp..prod.js gzip	95.1 kB	95.1 kB	✓
app-page-tur..prod.js gzip	96.9 kB	96.9 kB	✓
app-page-tur..prod.js gzip	91.4 kB	91.4 kB	✓
app-page.run...dev.js gzip	135 kB	135 kB	✓
app-page.run..prod.js gzip	90 kB	90 kB	✓
app-route-ex...dev.js gzip	22 kB	22 kB	✓
app-route-ex..prod.js gzip	14.8 kB	14.8 kB	✓
app-route-tu..prod.js gzip	14.8 kB	14.8 kB	✓
app-route-tu..prod.js gzip	14.6 kB	14.6 kB	✓
app-route.ru...dev.js gzip	21.7 kB	21.7 kB	✓
app-route.ru..prod.js gzip	14.6 kB	14.6 kB	✓
pages-api-tu..prod.js gzip	9.43 kB	9.43 kB	✓
pages-api.ru...dev.js gzip	9.7 kB	9.7 kB	✓
pages-api.ru..prod.js gzip	9.43 kB	9.43 kB	✓
pages-turbo...prod.js gzip	22 kB	22 kB	✓
pages.runtim...dev.js gzip	22.7 kB	22.7 kB	✓
pages.runtim..prod.js gzip	22 kB	22 kB	✓
server.runti..prod.js gzip	49.7 kB	49.7 kB	✓
Overall change	922 kB	922 kB	✓

Diff details

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Diff for edge-runtime-webpack.js

@@ -46,6 +46,12 @@
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+  /******/
   /******/ /* webpack/runtime/chunk loaded */
   /******/ (() => {
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Diff for middleware.js

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Commit: e2fa20f

[vercel-spaces]

Notifying the following users due to files changed in this PR based on this repo's notify modifiers:

@timneutkens, @ijjk, @shuding:

packages/next/src/server/config.ts

[shuding]

Thank you for this