commerce/lib/sanity/schemas/documents/usp.tsx

import {StarIcon} from '@sanity/icons'
import {defineField} from 'sanity'
import {languages} from '../../languages'
import {validateImage} from '../../utils/validation'

export default defineField({
  name: 'usp',
  title: 'USPs',
  type: 'document',
  icon: StarIcon,
  fields: [
    defineField({
      name: 'language',
      type: 'string',
      readOnly: true,
      description: 'Language of this document.',
      // hidden: true,
    }),
    // Title
    defineField({
      name: 'title',
      title: 'Title',
      type: 'string',
      description: 'USP title',
      validation: (Rule) => Rule.required(),
    }),
    // Image
    defineField({
      name: 'image',
      title: 'Image',
      type: 'mainImage',
      description: 'USP icon',
      validation: (Rule) => validateImage(Rule, true),
    }),
    // Text
    defineField({
      name: 'text',
      title: 'Text',
      type: 'text',
      description: 'Small text displayed below title.',
      rows: 5,
    }),
  ],
  preview: {
    select: {
      title: 'title',
      image: 'image',
      language: 'language',
    },
    prepare(selection) {
      const {image, title, language} = selection

      const currentLang = languages.find((lang) => lang.id === language)

      return {
        media: image,
        title,
        subtitle: `${currentLang ? currentLang.title : ''}`,
      }
    },
  },
})