feat: implement middleware and context provider for Express integration

app/contexts/express.ts

@@ -0,0 +1,3 @@
+import { createContext } from "react-router";
+
+export const expressValueContext = createContext<string>();

app/root.tsx

@@ -9,11 +9,13 @@ import {
 
 import type { Route } from "./+types/root";
 import "./app.css";
-import { rootAuthLoader } from "@clerk/react-router/server";
+import { clerkMiddleware, rootAuthLoader } from "@clerk/react-router/server";
 import { Navbar } from "~/components/navbar";
 import { ClerkProvider } from "@clerk/react-router";
 import { Toaster } from "~/components/ui/sonner";
 
+export const middleware: Route.MiddlewareFunction[] = [clerkMiddleware()];
+
 export async function loader(args: Route.LoaderArgs) {
   return rootAuthLoader(args);
 }

app/routes/home.tsx

@@ -4,6 +4,7 @@ import { toast } from "sonner";
 
 import type { Route } from "./+types/home";
 import { Welcome } from "../welcome/welcome";
+import { expressValueContext } from "~/contexts/express";
 
 export function meta() {
   return [
@@ -17,7 +18,7 @@ export function meta() {
 
 export async function loader({ context }: Route.LoaderArgs) {
   return {
-    message: context.VALUE_FROM_EXPRESS,
+    message: context.get(expressValueContext) || "No message from Express",
   };
 }
 

react-router.config.ts

@@ -4,4 +4,7 @@ export default {
   // Config options...
   // Server-side render by default, to enable SPA mode set this to `false`
   ssr: true,
+  future: {
+    v8_middleware: true,
+  },
 } satisfies Config;

server/app.ts

@@ -2,16 +2,11 @@ import { createRequestHandler } from "@react-router/express";
 import { drizzle } from "drizzle-orm/postgres-js";
 import express from "express";
 import postgres from "postgres";
-import "react-router";
+import { RouterContextProvider } from "react-router";
 
 import { DatabaseContext } from "~/database/context";
 import * as schema from "~/database/schema";
-
-declare module "react-router" {
-  interface AppLoadContext {
-    VALUE_FROM_EXPRESS: string;
-  }
-}
+import { expressValueContext } from "~/contexts/express";
 
 export const app = express();
 
@@ -25,9 +20,9 @@ app.use(
   createRequestHandler({
     build: () => import("virtual:react-router/server-build"),
     getLoadContext() {
-      return {
-        VALUE_FROM_EXPRESS: "Hello from Express",
-      };
+      const context = new RouterContextProvider();
+      context.set(expressValueContext, "Hello from Express");
+      return context;
     },
   }),
 );