Disable strictExportPresence when webpack 5 is enabled

[timneutkens]

Solves an issue some users ran into where enabling webpack 5 highlighted a wrong JSON import where named exports were used for JSON data.

Should not import the named export 'myValue' (imported as 'myValue') from default-exporting module (only default export is available soon)

Bug

• Related issues linked using fixes #number
• Integration tests added

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.

Documentation / Examples

• Make sure the linting passes

[ijjk]

Stats from current PR

Default Server Mode (Decrease detected ✓)

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
buildDuration	13.3s	13.5s	⚠️ +247ms
buildDurationCached	4.2s	4.1s	-84ms
nodeModulesSize	46.3 MB	46.3 MB	⚠️ +288 B

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.409	2.349	-0.06
/ avg req/sec	1037.77	1064.11	+26.34
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.211	1.295	⚠️ +0.08
/error-in-render avg req/sec	2064.31	1930.54	⚠️ -133.77

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
597-HASH.js gzip	13.3 kB	13.3 kB	✓
778-HASH.js gzip	7.08 kB	7.08 kB	✓
framework-HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	151 B	151 B	✓
webpack-HASH.js gzip	993 B	993 B	✓
Overall change	60.8 kB	60.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	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	timneutkens/next.js fix/json-import-error	Change
_app-HASH.js gzip	1.3 kB	1.3 kB	✓
_error-HASH.js gzip	3.68 kB	3.68 kB	✓
amp-HASH.js gzip	558 B	558 B	✓
hooks-HASH.js gzip	924 B	924 B	✓
index-HASH.js gzip	243 B	243 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	336 B	336 B	✓
withRouter-HASH.js gzip	334 B	334 B	✓
Overall change	9.03 kB	9.03 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
_buildManifest.js gzip	349 B	349 B	✓
Overall change	349 B	349 B	✓

Rendered Page Sizes

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
index.html gzip	609 B	609 B	✓
link.html gzip	614 B	614 B	✓
withRouter.html gzip	604 B	604 B	✓
Overall change	1.83 kB	1.83 kB	✓

---

Serverless Mode

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
buildDuration	17.3s	17.3s	⚠️ +28ms
buildDurationCached	6.3s	6.2s	-113ms
nodeModulesSize	46.3 MB	46.3 MB	⚠️ +288 B

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
597-HASH.js gzip	13.3 kB	13.3 kB	✓
778-HASH.js gzip	7.08 kB	7.08 kB	✓
framework-HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	151 B	151 B	✓
webpack-HASH.js gzip	993 B	993 B	✓
Overall change	60.8 kB	60.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	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	timneutkens/next.js fix/json-import-error	Change
_app-HASH.js gzip	1.3 kB	1.3 kB	✓
_error-HASH.js gzip	3.68 kB	3.68 kB	✓
amp-HASH.js gzip	558 B	558 B	✓
hooks-HASH.js gzip	924 B	924 B	✓
index-HASH.js gzip	243 B	243 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	336 B	336 B	✓
withRouter-HASH.js gzip	334 B	334 B	✓
Overall change	9.03 kB	9.03 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
_buildManifest.js gzip	349 B	349 B	✓
Overall change	349 B	349 B	✓

Serverless bundles

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
_error.js	1.39 MB	1.39 MB	✓
404.html	2.76 kB	2.76 kB	✓
500.html	2.75 kB	2.75 kB	✓
amp.amp.html	10.7 kB	10.7 kB	✓
amp.html	1.96 kB	1.96 kB	✓
hooks.html	2.01 kB	2.01 kB	✓
index.js	1.39 MB	1.39 MB	✓
link.js	1.45 MB	1.45 MB	✓
routerDirect.js	1.44 MB	1.44 MB	✓
withRouter.js	1.44 MB	1.44 MB	✓
Overall change	7.15 MB	7.15 MB	✓

---

Webpack 4 Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
buildDuration	11.7s	11.2s	-584ms
buildDurationCached	4.6s	4.6s	-44ms
nodeModulesSize	46.3 MB	46.3 MB	⚠️ +288 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.34	2.332	-0.01
/ avg req/sec	1068.45	1072.06	+3.61
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.22	1.176	-0.04
/error-in-render avg req/sec	2048.55	2125.83	+77.28

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
677f882d2ed8..HASH.js gzip	13.4 kB	13.4 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-HASH.js gzip	7.16 kB	7.16 kB	✓
webpack-HASH.js gzip	751 B	751 B	✓
Overall change	60.2 kB	60.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	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	timneutkens/next.js fix/json-import-error	Change
_app-HASH.js gzip	1.28 kB	1.28 kB	✓
_error-HASH.js gzip	3.71 kB	3.71 kB	✓
amp-HASH.js gzip	536 B	536 B	✓
hooks-HASH.js gzip	888 B	888 B	✓
index-HASH.js gzip	227 B	227 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	303 B	303 B	✓
withRouter-HASH.js gzip	302 B	302 B	✓
Overall change	8.89 kB	8.89 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
_buildManifest.js gzip	371 B	371 B	✓
Overall change	371 B	371 B	✓

Rendered Page Sizes

	vercel/next.js canary	timneutkens/next.js fix/json-import-error	Change
index.html gzip	613 B	613 B	✓
link.html gzip	619 B	619 B	✓
withRouter.html gzip	607 B	607 B	✓
Overall change	1.84 kB	1.84 kB	✓

Commit: c286658

[Timer]

We should probably have a future rule that re-enables this behavior.

Extra nice would be to only disable this when webpack 5 is automatically enabled, but leaving the field enabled if the user explicitly turned on webpack 5.