collateNode.ts

const FOLLOWING = 4;
const CONTAINED_BY = 16;

const PRECEDING = 2;
const CONTAINS = 8;

export const collateNode = (a: Node, b: Node) => {
  const position = a.compareDocumentPosition(b);

  if (position & (FOLLOWING | CONTAINED_BY)) {
    return -1;
  }

  if (position & (PRECEDING | CONTAINS)) {
    return 1;
  }

  return 0;
};