fix(auth): export totp modular types / enable ios sms mfa (w/emulator patch) / add sms mfa to demo

[mikehardy]

Description

It has long irritated me that we could not test SMS MFA on iOS, and I was never certain it worked.

Now we have the ability with local/manual tests to auth against the cloud which allows for MFA testing.

Reviewer note: look at each commit separately, they each have one single idea for easy review

I extended the local TOTP test app to be a general MFA test app with TOTP and/or SMS, and verified that it does work - iOS SMS MFA works against the cloud.

That proved our ios sms mfa issue was emulator-specific, and I was able to quickly localize and patch the error so we can re-enable the e2e test that automatically verifies phone MFA

While doing this I noticed there weren't TOTP exports for modular (and the types weren't unit tested...), and I also thought adding a pointer to the MFA example could help people in docs.

Related issues

• See upstream PR fix(emulator, auth): allow SMS MFA finalization with obfuscated number firebase/firebase-tools#9062
• Original TOTP PR feat(auth): support TOTP enroll and unenroll #8621

Release Summary

fix release, based on the types fix.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

Everything here is backed by tests, and the goal was actually to improve testing of iOS SMS auth to verify it even worked

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Project	Deployment	Preview	Comments	Updated (UTC)
react-native-firebase	Ready	Preview	Comment	Sep 2, 2025 8:43pm

[mikehardy]

Honestly not sure why TotpSecret class is not defined in the types after my change, that's the jest failure.

Would love a quick set of 👀 if someone has an idea there. I tried changing it from class to interface but still fails 🤔

  ● Auth › modular › `TotpSecret` class is properly exposed to end user

    expect(received).toBeDefined()

    Received: undefined

      512 |
      513 |     it('`TotpSecret` class is properly exposed to end user', function () {
    > 514 |       expect(TotpSecret).toBeDefined();
          |                          ^
      515 |     });
      516 |
      517 |     it('`TotpMultiFactorGenerator` class is properly exposed to end user', function () {

      at Object.<anonymous> (packages/auth/__tests__/auth.test.ts:514:26)