Implement task queue and notifications

client/notifications.js

@@ -0,0 +1,21 @@
+"use strict";
+
+import m from "mithril";
+
+const notifications = new Set();
+
+function push(type, message) {
+  const n = { type: type, message: message, timestamp: Date.now() };
+  notifications.add(n);
+  m.redraw();
+  setTimeout(() => {
+    notifications.delete(n);
+    m.redraw();
+  }, 4000);
+}
+
+function getNotifications() {
+  return notifications;
+}
+
+export { push, getNotifications };