Restore vanilla components

app/javascript/mastodon/actions/alerts.js

@@ -0,0 +1,24 @@
+export const ALERT_SHOW    = 'ALERT_SHOW';
+export const ALERT_DISMISS = 'ALERT_DISMISS';
+export const ALERT_CLEAR   = 'ALERT_CLEAR';
+
+export function dismissAlert(alert) {
+  return {
+    type: ALERT_DISMISS,
+    alert,
+  };
+};
+
+export function clearAlert() {
+  return {
+    type: ALERT_CLEAR,
+  };
+};
+
+export function showAlert(title, message) {
+  return {
+    type: ALERT_SHOW,
+    title,
+    message,
+  };
+};