@cfxlabsinc/b2b-services
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    SignInForm: React.FC<
        PropsWithChildren<
            {
                action: SignInFormHandler;
                className?: string;
                hidden?: boolean;
                id?: string;
            },
        >,
    > = ...

    A step's <form action>. It works without JavaScript; with it, the fields' checks run first, refusals show on their fields, and focus moves to the first invalid one.