How to define css variables in style attribute in React and typescript

Like this:

function Component() {
  const style = { "--my-css-var": 10 } as React.CSSProperties;
  return <div style={style}>...</div>
}

Or without the extra style variable:

function Component() {
  return <div style={{ "--my-css-var": 10 } as React.CSSProperties} />
}