[@types/styled-components] as prop no longer works for string values

[kirkobyte]

In v5.1.10, if as is set using a string, the props available on the component won't be updated.

E.g. here when styling a react-router-dom Link component:

import {Link} from 'react-router-dom';

export const StyledLink = styled(Link)``;

/** Throws this error:
 * Property 'to' is missing in type '{ children: string; as: "span"; }' but required in type
 * 'Omit<Omit<LinkProps<unknown> & RefAttributes<HTMLAnchorElement>, never> & Partial<Pick<LinkProps<unknown> & RefAttributes<HTMLAnchorElement>, never>> & Omit<...> & Partial<...>, "theme">'
 **/
export const Component = () => <StyledLink as="span"}>Blah</StyledLink>;