Convert Root Folders to Typescript

frontend/src/Store/Selectors/createRootFoldersSelector.ts

@@ -0,0 +1,13 @@
+import { createSelector } from 'reselect';
+import { RootFolderAppState } from 'App/State/SettingsAppState';
+import createSortedSectionSelector from 'Store/Selectors/createSortedSectionSelector';
+import RootFolder from 'typings/RootFolder';
+
+export default function createRootFoldersSelector() {
+  return createSelector(
+    createSortedSectionSelector('rootFolders', (a: RootFolder, b: RootFolder) =>
+      a.path.localeCompare(b.path)
+    ),
+    (rootFolders: RootFolderAppState) => rootFolders
+  );
+}