How to migrate from Firebase Dynamic Links for email authentication in an Expo React Native app?

[GFoniX]

I'm currently using Firebase Authentication's sendSignInLinkToEmail method in my Expo React Native application like this:

getAuth()
  .sendSignInLinkToEmail(email, {
    handleCodeInApp: true,
    url: '...',
    android: {
      packageName: '...',
      installApp: true,
    },
    iOS: {
      bundleId: '...',
    },
  })

I've learned that Firebase Dynamic Links, which powers the email sign-in link functionality, will be discontinued. What's the recommended approach to migrate away from this method in an Expo React Native app?

Specifically:

• Is there a new preferred method to handle email link authentication in Firebase?
• Are there any Expo-specific considerations or packages I should be aware of?
• Has the Expo team or Firebase team published any migration guides for this specific scenario?

My project uses:

• Expo SDK 52
• React Native Firebase v21.12.0
• React Native 0.76.7

Any guidance would be greatly appreciated!

[nixolas1]

I think the React Native Firebase SDK needs to be updated to support linkDomain instead of dynamicLinksDomain.
Starting to get pretty close to the deprecation date now (with summer vacations and release schedules etc) :P
Any chance of getting this pretty soon? Seems like the JS and Android version of official Firebase SDK supports using linkDomain now at least.

Somethink like this

auth().sendSignInLinkToEmail(email, {
    handleCodeInApp: true,
    url: "https://web.web",
    iOS: {bundleId: BUNDLE_ID},
    android: {packageName: BUNDLE_ID},
    linkDomain: "PROJECT-ID.firebaseapp.com",
  })

https://firebase.google.com/docs/auth/web/email-link-auth

@mikehardy

EDIT: or maybe we need to run the admin change command, and it will work magically?
Step 2 here https://firebase.google.com/docs/auth/android/email-link-migration

[mikehardy]

I believe rnfb is ready for this, linkDomain support has been out for some time

[nixolas1]

Ah, yes, you're right, its got the linkDomain config option.
Still getting dynamic links in the email though, so I guess we need to run the firebase admin change command I mentioined.

[EmmJim]

Any updates on this? I keep getting dynamic links in the email as well :(

[jfournier2]

I had the same problem, I ran this node script on my Firebase hosting domain with firebase admin installed:

const admin = require("firebase-admin");
const serviceAccount = require("./service-account-key.json");

admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    projectId: '[YOUR_PROJECT_ID]',
});

const updateRequest = {
    mobileLinksConfig: {
        domain: 'HOSTING_DOMAIN'  // Litterally HOSTING_DOMAIN has to be written to make the changes to firebase hosting method
        // Write FIREBASE_DYNAMIC_LINK_DOMAIN to revert to dynamic links
    }
};

const updateProjectConfig = async () => {
    try {
        const auth = admin.auth();
        const projectConfigManager = auth.projectConfigManager();
        const response = await projectConfigManager.updateProjectConfig(updateRequest);
        console.log(response);
    } catch (error) {
        console.error(error);
    }
};

updateProjectConfig();

Launched, built and deployed it with this command:

node update-project-config.js && npm run build && firebase deploy --only hosting

And now no more dynamic links through the emails

BUT the universal/app links are not working because Firebase sends a 'sendGrid' link through the email which redirects to the right url, but with universal/app links redirecting to app only when a compatible url is pressed (not through a navigator redirection), it does not work for me, idk what we are intended to do.

Anyone has this problem ? A solution ?

EDIT:
An SMTP sendGrid was configured in my project, deactivating it made firebase send the unwrapped url, and the redirection into auth works flawlessly with no dynamic links