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Developing with Prismic
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In your Next.js page or layout component, you can fetch the layout data. You'll likely want to make this query in your layout component or in each page component, depending on your architecture.

Here's how you might fetch the layout data, including handling variations for menu items with and without sub-menus:

import { client } from '../prismicio';

export async function getLayoutData() {
  const layoutData = await client.getSingle('layout', {
    graphQuery: `{
      layout {
        ...layoutFields
        header {
          ...headerFields
          menu_items {
            ...menu_itemsFields
            variation {
              ...on MenuItemDefault {
                label
                link {
                  ...linkFields
                }
              }
              ...on MenuItemWithSubMenu {
                label
                sub_menu {
                  ...sub_menuFields
                  sub_menu_items {
                    ...sub_menu_itemsFields
                  }
                }
              }
            }
          }
        }
      }
    }`;
, // Adjust according to your custom type's API ID and field
  });

  return layoutData;
}

Step 3: Using the Data in Your Component

After fetching, you can pass the data to your layout or header component and render it accordingly. For example, if you're using server components in Next.js 14, you might pass the fetched layout data as props to your header component:

// In your page or layout component
const layoutData = await getLayoutData();

// Pass layoutData to your Header component
<Header layoutData={layoutData} />

Then, in your Header component, you would map over the layoutData to render your menu items and handle any sub-menus based on the structure of your Prismic documents.

Keep in mind that the exact implementation details will depend on your specific project setup, including how you've structured your custom types and documents in Prismic, and how you're handling state and props in your Next.js application. Adjust the field names and structure in the examples above according to your Prismic setup.

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