I have:

const propTypes = {
  ... // some other stuff
  disableEscapeKeyDown: PropTypes.bool,
};
export type ModalProps = PropTypes.InferProps<typeof propTypes>;

export default function ModalWindow({
  ...// other stuff
  disableEscapeKeyDown = false,
}: ModalProps) {
  const classes = useStyles({ width });
  return (
    <Modal
      open={open ?? false}
      onClose={onClose}
      disableEscapeKeyDown={disableEscapeKeyDown}
    >

But that gives me an error: Type 'boolean | null' is not assignable to type 'boolean | undefined'.

It seems that a MUI Modal takes boolean | undefined whereas the PropType has it has boolean | null. How can I reconcile that?