Use ya in case xa is false

[gr-qft]

This closes #18023.

I was following the example mentioned in the issue (https://github.com/vercel/next.js/tree/canary/examples/with-firebase-authentication) and for some reason xa was always false, failing fetching food. Through console.log I saw that ya contained a token value and using ya worked.

[lfades]

@gr-qft Thank you. LGTM!

The name of those variables is confusing 🤔 🤣

[ijjk]

Stats from current PR

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General

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
buildDuration	12.6s	12.9s	⚠️ +383ms
nodeModulesSize	62.5 MB	62.5 MB	✓

Page Load Tests Overall decrease ⚠️

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
/ failed reqs	0	0	✓
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Client Bundles (main, webpack, commons)

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framework.HASH.js gzip	39 kB	39 kB	✓
main-0297b89..3d55.js gzip	7.34 kB	7.34 kB	✓
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Client Bundles (main, webpack, commons) Modern

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framework.HA..dule.js gzip	39 kB	39 kB	✓
main-8539e6d..dule.js gzip	6.32 kB	6.32 kB	✓
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Overall change	53 kB	53 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
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	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
_buildManifest.js gzip	322 B	322 B	✓
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Rendered Page Sizes

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index.html gzip	1 kB	1 kB	✓
link.html gzip	1.01 kB	1.01 kB	✓
withRouter.html gzip	996 B	996 B	✓
Overall change	3.01 kB	3.01 kB	✓

---

Serverless Mode

General

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
buildDuration	14.8s	14.7s	-62ms
nodeModulesSize	62.5 MB	62.5 MB	✓

Client Bundles (main, webpack, commons)

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
677f882d2ed8..35e7.js gzip	11.1 kB	11.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-0297b89..3d55.js gzip	7.34 kB	7.34 kB	✓
webpack-e067..f178.js gzip	751 B	751 B	✓
Overall change	58.1 kB	58.1 kB	✓

Client Bundles (main, webpack, commons) Modern

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
677f882d2ed8..dule.js gzip	6.94 kB	6.94 kB	✓
framework.HA..dule.js gzip	39 kB	39 kB	✓
main-8539e6d..dule.js gzip	6.32 kB	6.32 kB	✓
webpack-07c5..dule.js gzip	751 B	751 B	✓
Overall change	53 kB	53 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
polyfills-4b..e242.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

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_app-9a0b9e1..b37e.js gzip	1.28 kB	1.28 kB	✓
_error-ed1b0..8fbd.js gzip	3.44 kB	3.44 kB	✓
hooks-89731c..c609.js gzip	887 B	887 B	✓
index-17468f..5d83.js gzip	227 B	227 B	✓
link-89ad9e7..25bb.js gzip	1.34 kB	1.34 kB	✓
routerDirect..924c.js gzip	284 B	284 B	✓
withRouter-7..c13d.js gzip	284 B	284 B	✓
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Client Pages Modern

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hooks-cbf13f..dule.js gzip	387 B	387 B	✓
index-b9a643..dule.js gzip	226 B	226 B	✓
link-aeb707b..dule.js gzip	1.29 kB	1.29 kB	✓
routerDirect..dule.js gzip	284 B	284 B	✓
withRouter-f..dule.js gzip	282 B	282 B	✓
Overall change	5.39 kB	5.39 kB	✓

Client Build Manifests

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
_buildManifest.js gzip	322 B	322 B	✓
_buildManife..dule.js gzip	329 B	329 B	✓
Overall change	651 B	651 B	✓

Serverless bundles

	vercel/next.js canary	gr-qft/next.js fix/with-firebase-auth-cookies	Change
_error.js	1.06 MB	1.06 MB	✓
404.html	4.34 kB	4.34 kB	✓
hooks.html	3.92 kB	3.92 kB	✓
index.js	1.06 MB	1.06 MB	✓
link.js	1.1 MB	1.1 MB	✓
routerDirect.js	1.1 MB	1.1 MB	✓
withRouter.js	1.1 MB	1.1 MB	✓
Overall change	5.42 MB	5.42 MB	✓

Commit: 19a8f59

[gr-qft]

@lfades They are 😄 , and I tried to google them but couldn't find anything good to read about them.

Would be great if anyone can point me to some sources (and I can update the README doc too to include the sources if needed).

[SylvainGarrigues]

Accessing xa and ya doesn't seem documented anywhere + it does not renew the token like getIdToken does (which is otherwise renewed only when accessing other firebase services)

See #18256