// simpler react types
declare class Component<P> {
  props: P;
}

export type ComponentClass<P> = {
  new (props: P): Component<P>;
};

export type FunctionComponent<P> = (props: P) => null;

export type ComponentType<P> = FunctionComponent<P> | ComponentClass<P>;

// simpler react-router.d.ts
export interface RouteComponentProps {
  route: string;
}

declare function withRouter<
  P extends RouteComponentProps,
  C extends ComponentType<P>
>(
  component: C & ComponentType<P>
): ComponentClass<Omit<P, keyof RouteComponentProps>>;

interface Props extends RouteComponentProps {
  username: string;
}

declare const MyComponent: ComponentType<Props>;

// If I define `ComponentType` as `ComponentClass<P> | FunctionComponent<P>`:
// Argument of type 'ComponentType<Props>' is not assignable to parameter of type 'ComponentClass<Props> | (ComponentClass<Props> & FunctionComponent<Props>)'.
// If I define `ComponentType` as `FunctionComponent<P> | ComponentClass<P>`:
// Argument of type 'ComponentType<Props>' is not assignable to parameter of type 'FunctionComponent<Props> | (FunctionComponent<Props> & ComponentClass<Props>)'.
withRouter(MyComponent);