DefinitelyTyped/react-router/lib/applyRouterMiddleware.d.ts

import { RouteComponent } from "react-router";
import RouterContext from "react-router/lib/RouterContext";

export interface Middleware {
    renderRouterContext?: (previous: RouterContext, props: any) => RouterContext;
    renderRouteComponent?: (previous: RouteComponent, props: any) => RouteComponent;
}

export default function applyRouterMiddleware(...middlewares: Middleware[]): (renderProps: any) => RouterContext;