layout-definition.ts

const definition = Layout.composition({
  type: "site-composition",
  props: {},
  contentAreas: {
    header: [
      {
        type: "site-header",
        props: {
          title: "Main title"
        }
      }
    ],
    content: [
      {
        type: "content-box",
        props: {
          content: "Content that will appear in this content box"
        }
      }
    ]
  }
});