Ported sanity studio to Next js app

lib/sanity/schemas/singletons/home.tsx

@@ -0,0 +1,69 @@
+import {HomeIcon} from '@sanity/icons'
+import {defineField} from 'sanity'
+import {languages} from '../../languages'
+import {COMPONENT_REFERENCES} from '../../constants'
+
+export default defineField({
+  name: 'home',
+  title: 'Home',
+  type: 'document',
+  icon: HomeIcon,
+  groups: [
+    {
+      name: 'editorial',
+      title: 'Editorial',
+    },
+    {
+      name: 'seo',
+      title: 'SEO',
+    },
+  ],
+  fields: [
+    defineField({
+      name: 'language',
+      type: 'string',
+      readOnly: true,
+      description: 'Language of this document.',
+      // hidden: true,
+    }),
+    // Title
+    {
+      name: 'title',
+      title: 'Title',
+      type: 'string',
+      description: 'Page title.',
+      validation: (Rule) => Rule.required(),
+    },
+    defineField({
+      name: 'content',
+      title: 'Page sections',
+      type: 'array',
+      group: 'editorial',
+      description: 'Add, reorder, edit or delete page sections.',
+      of: COMPONENT_REFERENCES,
+    }),
+    // SEO
+    defineField({
+      name: 'seo',
+      title: 'SEO',
+      type: 'seo',
+      group: 'seo',
+    }),
+  ],
+  preview: {
+    select: {
+      title: 'title',
+      language: 'language',
+    },
+    prepare(selection) {
+      const {title, language} = selection
+
+      const currentLang = languages.find((lang) => lang.id === language)
+
+      return {
+        title: `${title}`,
+        subtitle: `${currentLang ? currentLang.title : ''}`,
+      }
+    },
+  },
+})