Set up pinia

gdn-app/src/stores/foo.ts

@@ -0,0 +1,12 @@
+import { defineStore } from "pinia";
+import { ref } from "vue";
+
+export const useFooStore = defineStore("foo", () => {
+  const name = ref("foo");
+
+  function setName(to: string) {
+    name.value = to;
+  }
+
+  return { name, setName };
+});