get current surrounding block in context

currentBlock.js

get currentBlock() {
  let anchor = this.selected.anchor
    , context = this.context;

  if (!anchor) return;

  return (function traverseUp(node) {
    let block = node
      , parent = node.parentNode;

    if (parent && parent !== context) {
      block = traverseUp(parent);
    }

    return block;
  })(anchor);
}