go-as-typescript.ts

type Thing = {
  data: string
  printData: () => void
}

const printData = (t: Thing) => () => {
  console.log(t.data)
}

const createThing = (): Thing => {
  const state = {
    data: 'hey'
  }
  return {
    ...state
    printData: printData(state)
  }
}

// Usage
const thing = createThing()
thing.printData()