README examples fail

[pata-eth]

hi, folks. I started a node project from scratch to test out this module. I placed the following snippet from the README into index.js

import { MetadataApi } from '@cowprotocol/app-data'

export const metadataApi = new MetadataApi()

const appCode = 'YOUR_APP_CODE'
const environment = 'prod'
const referrer = { address: `REFERRER_ADDRESS` }

const quote = { slippageBips: '0.5' } // Slippage percent, it's 0 to 100
const orderClass = { orderClass: 'market' } // "market" | "limit" | "liquidity"

const appDataDoc = await metadataApi.generateAppDataDoc({
  appCode,
  environment,
  metadata: {
    referrer,
    quote,
    orderClass,
  },
})

const { cid, appDataHex, appDataContent } = await metadataApi.appDataToCid(appDataDoc)

run node index.js and fails with

[Error]: Invalid appData provided: AppData version 1.1.0 doesn't exist
    at f (file:///Users/pata/projects/appdata/node_modules/@cowprotocol/app-data/dist/index.modern.mjs:1:2169)

package.json needs "type": "module" to run this script and replicate. What am I missing? Thanks