@cfxlabsinc/b2b-services
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    PasskeySignInButton: React.FC<
        {
            answer: SignInFormHandler;
            email: string;
            noPasskeyMessage?: string;
            primary?: boolean;
            requestOptions?: string;
            restartFormId: string;
            start: SignInFormHandler;
        },
    > = ...

    Logs in with a passkey: asks Cognito for a challenge (start, which comes back to this page with requestOptions), opens the browser's prompt, and posts what it signed (answer). Also opens a prompt asked for on /login. A prompt the page opened by itself says nothing when it's closed, and an address with no passkey left is forgotten.