Inferred link props with TS template literal types

weird.tsx

type LinkProps<T extends { href: any }> = T extends { href: infer U }
	// If our `href` prop starts with a given substring, we might
	// determine that we have an external link and filter internal
	// routing-related props. This could just as easily work in reverse!
	? U extends `https://${string}` | `http://${string}`
		? ExternalLinkProps
		: InternalLinkProps
	: never;