How to return a thenable object that really works

Question

I'm trying to create a thenable object that returns a value, but isn't working:

const fetchItem = () => 'item';
function test() {
  return {
    async then() {
      const item = await fetchItem()
      return item
    }
  }
}

test()
  .then(console.log)

The then is being called, but the console.log it isn't. Any ideias why?

Answer 1

.then should be a function that accepts a callback as a parameter - your then definition doesn't have one.

function test() {
  return {
    async then(callback) {
      const item = await '3';
      return callback(item);
    }
  }
}
test()
  .then(console.log)
  .then(() => console.log('done'));