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              class Fetcher{
    this.whoAmI = `hi im ${name}`
    return fetch(`https://jsonplaceholder.typicode.com/posts/${postNumber}`)
    .then(res => res.ok ? res.json() : Promise.reject(res))

class stubbedFetcher{
    this.whoAmI = "hi im just a faker"
    return Promise.resolve(`get'd fake post ${postNumber}`)

const ExtendsFetcher = ({SuperClass = Fetcher, ...props} = {}) => {
  if (! new.target) {
       throw "Uncaught TypeError: Class constructor ExtendsFetcher cannot be invoked without 'new'"

  class ExtendsFetcher extends SuperClass{
      return 'hello world'
      console.log('extended get!')
      return super.get(params)

  return new ExtendsFetcher(...props)

const a = new ExtendsFetcher({name: 'Bob'})
console.log( a.whoAmI )
console.log( a.method1() )

const b = new ExtendsFetcher({SuperClass: stubbedFetcher, name: 'Alice'})
console.log( b.whoAmI )
console.log( b.method1() )

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