Getting user data in a Sanity query and using a person document type for authors

import userStore from 'part:@sanity/base/user'
// remember to add rxjs/operators to your dependencies with npm or yarn
import {
  map
} from 'rxjs/operators'

export default () => userStore.currentUser.pipe(
  map(({user}) => {
    const {email} = user

    console.log("Email:", email);
  })
)

import client from 'part:@sanity/base/client'
import userStore from 'part:@sanity/base/user'

const getAuthorId = async () => {
  const {id = '', email = '', name = ''} = await userStore.getUser('me')
  const _id = await client.fetch(`*[
    _type == "author" && (
      sanityID == $id ||
      email == $email ||
      name match $name
    )
  ][0]._id`, {id, email, name}).catch(error => console.error(error) || null)
  return _id
}
export default  {
  title: 'Post',
  name: 'post',
  type: 'document',
  initialValue: async () => {
    const authorId = await getAuthorId()
    if (!authorId) {
      return {}
    }
    return {
      authors: [
        {
          _type: 'reference',
          _ref: authorId
        }
      ]
    }
  },
  fields: [ /* the post fields */]
}