feat(webauthn): passkey autofill (conditional mediation) support#43
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Adds the SDK capability for "passkey autofill" so a login form can offer
discoverable passkeys inline in the username field instead of only via the
explicit "Sign in with a passkey" button.
- isConditionalMediationAvailable(): feature-detect conditional mediation.
- loginWithPasskey(email, opts): accepts { mediation, signal } and threads
them into navigator.credentials.get().
- loginWithPasskeyAutofill(): starts a conditional-mediation ceremony with a
managed AbortController; resolves only when the user picks a passkey.
- cancelPasskeyAutofill(): aborts a pending autofill (e.g. on unmount).
A modal loginWithPasskey() aborts any pending autofill first, since the
browser allows only one outstanding credential request.
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Adds the SDK capability for passkey autofill (WebAuthn conditional mediation) so a login form can surface discoverable passkeys inline in the username field's autofill dropdown — the smoother alternative to the explicit "Sign in with a passkey" button.
API
isConditionalMediationAvailable(): Promise<boolean>— feature-detect.loginWithPasskey(email?, opts?)—optsnow accepts{ mediation, signal }, threaded intonavigator.credentials.get(). Backward compatible.loginWithPasskeyAutofill(): Promise<ApiResponse<AuthToken>>— starts a conditional-mediation ceremony with a managedAbortController; resolves only when the user picks a passkey (fire on mount, ignore abort errors).cancelPasskeyAutofill(): void— abort a pending autofill (e.g. on unmount).Coordination
The browser allows only one outstanding
navigator.credentials.get(). A modalloginWithPasskey()(the explicit button) aborts any pending autofill first, so the two flows coexist without "a request is already pending" errors. Coordination lives in the SDK so UI callers don't have to manage it.Tests
Added coverage for the guard path (autofill fails cleanly with no network call when conditional mediation is unavailable) and that
cancelPasskeyAutofillis safe with nothing in flight. Full browser ceremony is exercised live, consistent with the existing webauthn tests. Build + DTS typecheck + eslint clean.Follow-up
authorizer-reactwill consume this to addautocomplete="username webauthn"on the login email field and start autofill on mount — that PR depends on releasing this SDK version and bumping the dependency.