Callback functions for each item of a sequence

[dbismut]

This lib looks really impressive!

I'm curious if there is a way to execute a callback / step for each item of a sequence. I've tried the following but it didn't work:

const o = { a: 1 }

Fat.animate(
  { obj: o },
  [
    {
      a: { from: 1, to: 0, duration: 2000 },
      callback: function () { // <-- this is what I'm interested in
        console.log('First animation finished')
      },
    },
    {
      a: { to: 1, duration: 2000 },
    },
  ],
  {
    callback: function () {
      console.log('All animations finished')
    },
  }
)