Variable SubmitButton`Const`

SubmitButton: React.FC<
    PropsWithChildren<
        Pick<ButtonProps, "variant" | "className" | "aria-describedby"> & {
            intent?: string;
            onClick?: (event: ReactMouseEvent<HTMLButtonElement>) => void;
            pendingLabel: string;
        },
    >,
> = ...

Submits the enclosing form and spins while it runs. Two buttons in one form tell their presses apart by intent, so only the pressed one spins.