Convert some selectors to Typescript

frontend/src/Store/Selectors/createExecutingCommandsSelector.ts

@@ -0,0 +1,14 @@
+import { createSelector } from 'reselect';
+import AppState from 'App/State/AppState';
+import { isCommandExecuting } from 'Utilities/Command';
+
+function createExecutingCommandsSelector() {
+  return createSelector(
+    (state: AppState) => state.commands.items,
+    (commands) => {
+      return commands.filter((command) => isCommandExecuting(command));
+    }
+  );
+}
+
+export default createExecutingCommandsSelector;