Types for Route class are wrong

Types:

class Route extends React.Component<RouteProps> {}

Js code:

/**
 * Convenience class for creating normal routes with JSX. When not using JSX,
 * use a POJSO instead of this class.
 */
export default class Route {
  constructor(props) {
    Object.assign(this, props);
  }
}

if (__DEV__) {
  // Workaround to make React Proxy give me the original class, to allow
  // makeRouteConfig to get the actual class, when using JSX for routes.
  Route.prototype.isReactComponent = {};
}

Because of this, I can't extend this class:

class Foo extends Route {
  render({ Component, props }) {
  }
}

Start by comparing the TypeScript Route declaration with the JavaScript Route class shown in the issue, then reproduce the type error when Foo extends Route. Done means the declaration permits that extension while preserving the existing RouteProps typing and route behavior.