Structure Builder for "markets" that share schema and populate an initial value template

market-separated-desk-structure.js

import React from 'react'
import S from '@sanity/desk-tool/structure-builder'
import schema from 'part:@sanity/base/schema'
import userStore from 'part:@sanity/base/user'

// npm i pluralize
import pluralize from 'pluralize'

// BYO "Flag" component for an Icon
// import Flag from '../components/Flag/index'

// Customise as required
export const MARKETS = [
  {
    name: `DE`,
    title: `Germany`,
    languages: [`de`, `en`],
  },
  {
    name: `US`,
    title: `USA`,
    languages: [`en`],
  },
  {
    name: `CA`,
    title: `Canada`,
    languages: [`en`, `fr-ca`],
  },
]

// These must be registered to your schema
export const SCHEMAS = [`article`, `product`, `page`, `settings`]

const schemaItem = (market, schemaType) =>
  S.listItem()
    .id(`${market.name}-${schemaType}`)
    .title(`${pluralize.plural(schema.get(schemaType).title)}`)
    .schemaType(schemaType)
    .child(
      S.documentTypeList(schemaType)
        .title(`${market.title} ${pluralize.plural(schema.get(schemaType).title)}`)
        .filter(`_type == $schemaType && market == $market`)
        .params({schemaType, market: market.name})
      
        // You will need to separate setup an initial value template which expects a string param of "market"
        .initialValueTemplates([
          S.initialValueTemplateItem(schemaType, {
            market: market.name,
          }),
        ])
    )

const allSchemaItems = (market) => SCHEMAS.map((schemaType) => schemaItem(market, schemaType))

const marketItem = (market) =>
  S.listItem(market.name)
    .id(`${market.name}-` + `market`)
    .title(market.title)
    // .icon(() => <Flag market={market.name} />)
    .child(S.list().title(`${market.title} Market Content`).items(allSchemaItems(market)))

export default () => {
  const title = `All Markets`
  const items = MARKETS.map((market) => marketItem(market))

  return S.list().title(title).items(items)  
}

This should result in a desk structure that looks something like the below. With documents filtered to only those with the field market set to the value of the market.

As well as initial value templates which populate new documents with the current market.