Display random document in the studio desk

import S from '@sanity/desk-tool/structure-builder'
import client from 'part:@sanity/base/client'

export default () =>
  S.list()
    .title('Content')
    .items([
      S.documentTypeListItem('idea').title('Ideas'),
      // New item in the desk menu:
      S.listItem()
        // Add a recognizable title & icon
        .title('Random idea')
        .icon(FiHelpCircle)
        // And use an async function to resolve its content
        .child(async () => {
          // It'll first fetch the ids of every idea in the dataset
          const ids = await client.fetch(`*[_type == 'idea']._id`)
          // Get a random one from that list
          const chosenId = getRandomItem(ids)
          // And display the document for this random one
          return S.document().id(chosenId).schemaType('idea')
        }),
      // ...
    ])
    
// Used to find a random id every time the
// "Random Idea" menu is clicked
function getRandomItem(arr) {
  const randomIndex = Math.floor(Math.random() * arr.length)
  return arr[randomIndex]
}