fixes import path for server function's real handler in monorepo with nested folders (#61)

* fixes import path for server function's real handler in monorepo with nested folders

* Fix server function handler import path building on Windows

---------

Co-authored-by: Frank <[email protected]>

Author: rwlanup

.changeset/bright-buses-reflect.md

@@ -0,0 +1,5 @@
+---
+"open-next": patch
+---
+
+Fix server function handler import path building on Windows

packages/open-next/src/build.ts

@@ -188,9 +188,11 @@ function createServerBundle(monorepoRoot: string) {
   //       the root of the bundle. We will create a dummy `index.mjs`
   //       that re-exports the real handler.
   if (isMonorepo) {
+    // always use posix path for import path
+    const packagePosixPath = packagePath.split(path.sep).join(path.posix.sep);
     fs.writeFileSync(
       path.join(outputPath, "index.mjs"),
-      [`export * from "./${packagePath}/index.mjs";`].join("")
+      [`export * from "./${packagePosixPath}/index.mjs";`].join("")
     );
   }