Replace interface with types to support statically known members

Author: BasselAshi

packages/react-router-loading/lib/Route.tsx

@@ -1,7 +1,7 @@
 import React, { FC } from 'react';
 import { Route as OriginalRoute, RouteProps as OriginalRouteProps } from 'react-router';
 
-interface RouteProps extends OriginalRouteProps {
+type RouteProps = OriginalRouteProps & {
   loading?: boolean;
 }
 

packages/react-router-loading/lib/utils.ts

@@ -1,7 +1,7 @@
 import React from 'react';
 import { matchRoutes, RouteObject, Location } from 'react-router';
 
-export interface LoadingRouteObject extends RouteObject {
+export type LoadingRouteObject = RouteObject & {
   loading?: boolean;
 }