Add the Expo Offline support page

[anagstef]

Important

🔎 Previews:

• https://clerk.com/docs/pr/1781/references/expo/offline-support

Explanation:

• We introduce a new experimental feature that allows Clerk to cache its resources on Expo, so it can be initialized when the network is not online.
• ⚠️ This page should not go live until the feat(clerk-expo): Improved offline support for Expo javascript#4604 is merged and released!

This PR:

• Adds a new page that adds documentation for Expo offline support experimental feature.

Checklist

• I have clicked on "Files changed" and performed a thorough self-review
• I have added the "deploy-preview" label and added the preview link(s) to this PR description
• All existing checks pass

[github-actions]

Hey, here’s your docs preview: https://clerk.com/docs/pr/1781

[alexisintech]

posted my code review - let me know if it looks okay :)

[anagstef]

@alexisintech Looks great! Thank you!

Can we also mark line 4?
import { secureStore } from '@clerk/clerk-expo/secure-store'

[royanger]

Glad to see this getting added (docs and the support both)!

[alexisintech]

thanks for getting this in there!! looks great 😸💖

[alexisintech]

is offline support for expo web or expo native or both? it looks like the manifest organization got messed up

[alexisintech]

waiting to see if the hooks are for native, web, or both

[anagstef]

@alexisintech Both the hooks and the offline support are used only on the Expo native.

Got more info from the team and correcting myself here.

So:

• Offline Support: Works only on native. If you use it on the Expo Web it simply does nothing.
• useLocalCredentials() hook: Works only on native. On the Expo Web it won't cause issues, but it's like it does not exist (you always get null values for your local credentials).
• useOAuth() hook: Works both on native and web. On the web you can also use the ClerkJS functionality to sign-in with OAuth as you would do in a web-only app, but we suggest to use the hook so that developers have a single code snippet for both web and native.

[alexisintech]

woohoo 😸💖