@cfxlabsinc/b2b-services
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    PasskeyAutoPrompt: React.FC<
        { isSingleSignOn: (email: string) => Promise<boolean | null> },
    > = ...

    On /login: the address this browser last used a passkey for is filled in and sent on, once per page load, and the next page opens its prompt unasked. A domain since moved to single sign-on is forgotten instead, since asking would send the browser to its IdP.