articles.001.005.component-type-approach-2.tsx

// Approach 2: diving back in looking for a better way
// 
// We can create a type that accepts a type parameter
// and puts a constraint on it, in our case we will demand
// the type parameter to be a React.FC
type AssertComponent<C extends React.FC<any>> = C;

// Then we use it in our Select component
function Select<T>(props: SelectProps<T>) {
  return null;
}

// If the Select does not look like a React component, this line will trigger an error
type AssertSelect = AssertComponent<typeof Select>;

// However we ended up with an unused type AssertSelect :(
// And we can still pass invalid defaultProps :(((
Select.defaultProps = 7;