Alert

{
  "kind": "component",
  "name": "Alert",
  "props": {
    "variant": { "expr": "lit", "value": "default" },
    "title": { "expr": "lit", "value": "Heads up!" }
  },
  "children": [
    { "kind": "text", "value": { "expr": "lit", "value": "This is an alert message." } }
  ]
}