diff --git a/js/schema/plugin.json b/js/schema/plugin.json
index 0c4b6bc..2ca3d8e 100644
--- a/js/schema/plugin.json
+++ b/js/schema/plugin.json
@@ -49,7 +49,7 @@
           "pattern": "^.+?:\/\/([^:]*:.*@.*|[^@]*)$"
         },
         "type": {
-          "description": "Directory to be first opened (e.g., myDir/mySubdir)",
+          "description": "The backend type to use for the resource (PyFS or fsspec)",
           "type": "string",
           "enum": ["pyfs", "fsspec"],
           "default": "pyfs"
diff --git a/js/src/index.tsx b/js/src/index.tsx
index 8286431..27f13d9 100644
--- a/js/src/index.tsx
+++ b/js/src/index.tsx
@@ -82,7 +82,7 @@ export const browser: JupyterFrontEndPlugin<ITreeFinderMain> = {
 
     let columns = settings?.composite.display_columns as Array<keyof ContentsProxy.IJupyterContentRow> ?? ["size"];
 
-    const sharedSidebarProps: Omit<Omit<TreeFinderSidebar.ISidebarProps, "type">, "url"> = {
+    const sharedSidebarProps: Omit<TreeFinderSidebar.ISidebarProps, "type" | "url"> = {
       app,
       manager,
       paths,
diff --git a/jupyterfs/fs_wrapper.py b/jupyterfs/fs_wrapper.py
index f464085..ecde1df 100644
--- a/jupyterfs/fs_wrapper.py
+++ b/jupyterfs/fs_wrapper.py
@@ -37,7 +37,7 @@ def __enter__(self):
 
     def __exit__(self, *args):
         if self.type == "pyfs":
-            self.fs.__exit__(*args)
+            return self.fs.__exit__(*args)
 
     def _wrap_path(self, path):
         if self.type == "pyfs":
@@ -89,20 +89,14 @@ def writetext(self, path, data):
 
     def exists(self, path):
         path = self._wrap_path(path)
-        if self.type == "pyfs":
-            return self.fs.exists(path)
         return self.fs.exists(path)
 
     def isdir(self, path):
         path = self._wrap_path(path)
-        if self.type == "pyfs":
-            return self.fs.isdir(path)
         return self.fs.isdir(path)
 
     def isfile(self, path):
         path = self._wrap_path(path)
-        if self.type == "pyfs":
-            return self.fs.isfile(path)
         return self.fs.isfile(path)
 
     def listdir(self, path):
diff --git a/jupyterfs/metamanager.py b/jupyterfs/metamanager.py
index 1ac75ed..0cb6464 100644
--- a/jupyterfs/metamanager.py
+++ b/jupyterfs/metamanager.py
@@ -115,6 +115,9 @@ def initResource(self, *resources, options={}):
                             manager_type = FSManager
                         elif resource["type"] == "fsspec":
                             manager_type = FSSpecManager
+                        else:
+                            # Ensure we don't use manager_type from previous loop iteration
+                            raise FileSystemLoadError(f"Unrecognized filesystem type {resource["type"]!r}")
 
                         managers[_hash] = manager_type.create(
                             urlSubbed,