src/language-css/loc.js/calculateValueNodeLoc
function calculateValueNodeLoc(node, rootOffset, text) {
  if (node.source) {
    node.source.startOffset = calculateLocStart(node, text) + rootOffset;
    node.source.endOffset = calculateLocEnd(node, text) + rootOffset;
  }

  for (const key in node) {
    const child = node[key];

    if (key === "source" || !child || typeof child !== "object") {
      continue;
    }

    calculateValueNodeLoc(child, rootOffset, text);
  }
}