try windows

Author: Hajime-san

packages/fresh/src/internals_dev.ts

@@ -7,6 +7,7 @@ export {
   type IslandModChunk,
   type PendingStaticFile,
   prepareStaticFile,
+  toPosix,
   writeCompiledEntry,
 } from "./dev/dev_build_cache.ts";
 export { specToName } from "./dev/builder.ts";

packages/plugin-vite/src/plugins/server_snapshot.ts

@@ -13,6 +13,7 @@ import {
   pathToSpec,
   type PendingStaticFile,
   specToName,
+  toPosix,
   UniqueNamer,
 } from "fresh/internal-dev";
 import {
@@ -390,7 +391,7 @@ export function serverSnapshot(options: ResolvedFreshViteConfig): Plugin[] {
               if (def) {
                 return `fresh-island::${def.name}`;
               }
-              const routeDef = routeFileToName.get(file);
+              const routeDef = routeFileToName.get(toPosix(file));
               if (routeDef !== undefined) {
                 return `fresh-route::${routeDef}`;
               }