import Medusa from "@medusajs/medusa-js"
const medusa = new Medusa({ baseUrl: MEDUSA_BACKEND_URL, maxRetries: 3 })
// must be previously logged in or use api token
medusa.admin.customerGroups.create({
  name: 'VIP'
})
.then(({ customer_group }) => {
  console.log(customer_group.id);
});