fix: add missing error tracking for BetterAuth flows

[idoshamun]

Problem

The auth_strategy A/B experiment shows error rates down but signups also down in the BetterAuth (treatment) variation. Investigation revealed that BetterAuth code paths silently swallow errors without logging analytics events — the errors are not actually gone, they are just invisible.

Silent failure paths found

File	Function	What fails silently
useLogin.ts	onSubmitSocialLogin	betterAuthSignInWithIdToken returns error → no event logged
useLogin.ts	onSubmitSocialLogin	getBetterAuthSocialUrl returns null → no event logged
useRegistration.ts	betterAuthRegister.onSuccess	res.error → calls onInvalidRegistration but no analytics event
useRegistration.ts	betterAuthRegister.onSuccess	res.status && !res.user fallback → no analytics event
useRegistration.ts	onSocialRegistration	betterAuthSignInWithIdToken returns error → no event logged
useRegistration.ts	onSocialRegistration	getBetterAuthSocialUrl returns null → no event logged
AuthOptionsInner.tsx	social login handler	betterAuthSignInWithIdToken returns error → no event logged
AuthOptionsInner.tsx	social login handler	getBetterAuthSocialUrl returns null → no event logged

Impact on experiment

The Kratos (control) path logs errors at every failure point. BetterAuth paths return early without logging, making the error rate metric artificially low. Meanwhile, users are silently dropping off, explaining the signup/login success drop.

Changes

• useLogin.ts: Log login error event on betterAuthSignInWithIdToken failure and getBetterAuthSocialUrl failure. Also removed redundant if (socialUrl) check after early return.
• useRegistration.ts: Log registration error event on betterAuthSignUp error response, fallback error, betterAuthSignInWithIdToken failure, and getBetterAuthSocialUrl failure.
• AuthOptionsInner.tsx: Log login error event on betterAuthSignInWithIdToken failure and getBetterAuthSocialUrl failure.

All events use the existing AuthEventNames (login error / registration error) so they flow into the existing GrowthBook metrics. Each event includes an origin field prefixed with betterauth for easy filtering:

• betterauth native id token
• betterauth social url
• betterauth signup error
• betterauth signup fallback error
• betterauth native id token registration
• betterauth social url registration

Testing

• Trigger social login with BetterAuth enabled → verify login error event fires on failure
• Trigger email signup with BetterAuth enabled → verify registration error event fires on failure
• Verify existing Kratos paths still log events as before (no changes to those paths)
• Check analytics events table for new betterauth origin events after deploy

Preview domain

https://fix-better-auth-error-tracking.preview.app.daily.dev

[vercel]

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Project	Deployment	Actions	Updated (UTC)
daily-webapp	Ready	Preview	Mar 22, 2026 8:52am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
storybook	Ignored		Mar 22, 2026 8:52am