example.js

function singularRootFieldName(queryFields, type) {
  return Object.keys(queryFields).find(fieldName => queryFields[fieldName].type === type)
}

function pluralRootFieldName(queryFields, type) {
  const expectedType = `[${type}!]!`
  return Object.keys(queryFields).find(fieldName => String(queryFields[fieldName].type) === expectedType)
}

//////
const query = schema.getType(`Query`)
const queryFields = query.getFields()

const gatsbyNodeTypes = possibleTypes.map((type) => ({
    remoteTypeName: type.name,
    remoteIdFields: ['__typename', 'id'],
    queries: `
      query LIST_${pluralRootFieldName(queryFields, type)} { ${pluralRootFieldName(queryFields, type)} }(first: $limit, skip: $offset) }
      query NODE_${singularRootFieldName(queryFields, type)} { ${singularRootFieldName(queryFields, type)}(where: $where) }`,
    nodeQueryVariables: ({ id }) => ({ where: { id } }),
  }))