Convert store selectors to Typescript

frontend/src/Store/Selectors/createQueueItemSelector.ts

@@ -0,0 +1,18 @@
+import { createSelector } from 'reselect';
+import AppState from 'App/State/AppState';
+
+function createQueueItemSelector() {
+  return createSelector(
+    (_: AppState, { episodeId }: { episodeId: number }) => episodeId,
+    (state: AppState) => state.queue.details.items,
+    (episodeId, details) => {
+      if (!episodeId || !details) {
+        return null;
+      }
+
+      return details.find((item) => item.episodeId === episodeId);
+    }
+  );
+}
+
+export default createQueueItemSelector;