offline warning

src/lib/online.svelte.ts

@@ -0,0 +1,24 @@
+import { writable } from "svelte/store";
+
+function createOnline() {
+  const { subscribe, set } = writable(navigator.onLine);
+
+  function handleOnline() {
+    set(true);
+  }
+
+  function handleOffline() {
+    set(false);
+  }
+
+  if (typeof window !== "undefined") {
+    window.addEventListener("online", handleOnline);
+    window.addEventListener("offline", handleOffline);
+  }
+
+  return {
+    subscribe,
+  };
+}
+
+export const online = createOnline();