OrderedMap to List to get the first item

Sort

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.7.2/immutable.min.js"></script>

Babel + JSX

console.clear();

var props = {
  "item": {
    "A": {
      "sequence": false,
      "color": "#F23123"
    },
    "B": {
      "sequence": true,
      "color": "#112F12"
    },
    "C":{
      "sequence": false,
      "color": "#A12A12"
    }
  }
}

var data = Immutable.fromJS(props,(key, value)=>{
     var isIndexed = Immutable.Iterable.isIndexed(value);
     return isIndexed ? value.toList() :value.toOrderedMap();
});
console.log(data)
var sorted = data.get('item').sort((itemA, itemB) => {
	console.log(itemA, itemB);
	
	var sortBysequence = itemA.sequence === itemB.sequence ? 0 : itemA.sequence ? 1 : 0;
  console.log("sortBysequence", sortBysequence)
  if (sortBysequence !== 0) {
    return sortBysequence;
  }
	var sortByColor = itemA.color < itemB.color ? -1 : itemA.color > itemB.color ? 1 : 0;
  console.log("sortByColor", sortByColor)
  return sortByColor;
});

console.log(sorted)