Use resolveRequest to compare symlinks, rather than fs.realpathSync (fix pnpm on Vercel)

[elliottsj]

Ported from #16369

This fixes #20948 by avoiding the error:

Error: ENOENT: no such file or directory, lstat '/vercel/workpath0/app/url'
--
15:28:10.448 | at realpathSync (fs.js:1643:7)
15:28:10.448 | at handleExternals (/vercel/workpath0/app/node_modules/.pnpm/next@10.0.5_react-dom@17.0.1+react@17.0.1/node_modules/next/dist/build/webpack-config.js:66:21)

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
buildDuration	10.2s	10.4s	⚠️ +111ms
nodeModulesSize	80.9 MB	80.9 MB	⚠️ +7.96 kB

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
/ failed reqs	0	0	✓
/ total time (seconds)	1.975	1.969	-0.01
/ avg req/sec	1265.55	1269.88	+4.33
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.226	1.271	⚠️ +0.04
/error-in-render avg req/sec	2038.85	1966.49	⚠️ -72.36

Client Bundles (main, webpack, commons)

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
677f882d2ed8..89aa.js gzip	13.1 kB	13.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-dba4ec1..27c0.js gzip	6.63 kB	6.63 kB	✓
webpack-50be..df5b.js gzip	751 B	751 B	✓
Overall change	59.4 kB	59.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
polyfills-81..14d7.js gzip	31.2 kB	31.2 kB	✓
Overall change	31.2 kB	31.2 kB	✓

Client Pages

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
_app-b6fc6bc..222c.js gzip	1.28 kB	1.28 kB	✓
_error-e2ffa..0f3f.js gzip	3.46 kB	3.46 kB	✓
hooks-010c20..8411.js gzip	887 B	887 B	✓
index-bbee2f..528b.js gzip	227 B	227 B	✓
link-d979103..c5ff.js gzip	1.64 kB	1.64 kB	✓
routerDirect..bf84.js gzip	303 B	303 B	✓
withRouter-a..5826.js gzip	302 B	302 B	✓
Overall change	8.09 kB	8.09 kB	✓

Client Build Manifests

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
_buildManifest.js gzip	323 B	323 B	✓
Overall change	323 B	323 B	✓

Rendered Page Sizes

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
index.html gzip	614 B	614 B	✓
link.html gzip	619 B	619 B	✓
withRouter.html gzip	606 B	606 B	✓
Overall change	1.84 kB	1.84 kB	✓

---

Serverless Mode

General Overall increase ⚠️

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
buildDuration	12.1s	12.1s	⚠️ +35ms
nodeModulesSize	80.9 MB	80.9 MB	⚠️ +7.96 kB

Client Bundles (main, webpack, commons)

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
677f882d2ed8..89aa.js gzip	13.1 kB	13.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-dba4ec1..27c0.js gzip	6.63 kB	6.63 kB	✓
webpack-50be..df5b.js gzip	751 B	751 B	✓
Overall change	59.4 kB	59.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
polyfills-81..14d7.js gzip	31.2 kB	31.2 kB	✓
Overall change	31.2 kB	31.2 kB	✓

Client Pages

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
_app-b6fc6bc..222c.js gzip	1.28 kB	1.28 kB	✓
_error-e2ffa..0f3f.js gzip	3.46 kB	3.46 kB	✓
hooks-010c20..8411.js gzip	887 B	887 B	✓
index-bbee2f..528b.js gzip	227 B	227 B	✓
link-d979103..c5ff.js gzip	1.64 kB	1.64 kB	✓
routerDirect..bf84.js gzip	303 B	303 B	✓
withRouter-a..5826.js gzip	302 B	302 B	✓
Overall change	8.09 kB	8.09 kB	✓

Client Build Manifests

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
_buildManifest.js gzip	323 B	323 B	✓
Overall change	323 B	323 B	✓

Serverless bundles

	vercel/next.js canary	elliottsj/next.js resolve-request	Change
_error.js	1 MB	1 MB	✓
404.html	2.67 kB	2.67 kB	✓
hooks.html	1.92 kB	1.92 kB	✓
index.js	1 MB	1 MB	✓
link.js	1.06 MB	1.06 MB	✓
routerDirect.js	1.05 MB	1.05 MB	✓
withRouter.js	1.05 MB	1.05 MB	✓
Overall change	5.18 MB	5.18 MB	✓

Commit: 06b8e96

[merceyz]

In #19518 this function is removed and replaced with require.resolve which probably makes this unnecessary

[elliottsj]

@merceyz Awesome. Looks like your PR was merged; I'll test it out soon to see if the issue is resolved.

[elliottsj]

Appears to be fixed 🎉