An infinite scroller for mutant, fed by pull-streams. Heavily inspired by pull-scroll.

const Scroller = require('mutant-scroll')

const scollableContainer = Scroller({
  streamToTop,
  streamToBottom,
  render
})

// => mutant html element <div class='Scroller'>

Keys you can provide mutant-scroll:

• render - a function called on each item to render html
• streamToTop, streamToBottom - (one required) at least one is required, is expected to be a pull-stream source.
• classList - (optional) an Array of classes to add to the final element
• prepend, append - (optional) supply array of html elements to insert before or after the streaming content.
• updateTop - (optional) a function which is passed (soFar, new) where new is the incoming value from the top stream, and soFar is the scrollers observable Array of values, which you're expected to mutate.
• updateBottom - (optional) similar to updateTop
• store - (optional) supply a mutant/array if you want to have external access to it, e.g. for caching
• comparer - (optional) a function used for the mutant map to compare those things it's rendering over
• overflowY - (optional) over-ride the default inline style over overflow-y
• cb - (optional) a callback called when errors happen