src/language-js/embed/css.js/format
function format(path, print, textToDoc) {
  const node = path.getValue();

  // Get full template literal with expressions replaced by placeholders
  const rawQuasis = node.quasis.map((q) => q.value.raw);
  let placeholderID = 0;
  const text = rawQuasis.reduce(
    (prevVal, currVal, idx) =>
      idx === 0
        ? currVal
        : prevVal +
          "@prettier-placeholder-" +
          placeholderID++ +
          "-id" +
          currVal,
    ""
  );
  const doc = textToDoc(
    text,
    { parser: "scss" },
    { stripTrailingHardline: true }
  );
  const expressionDocs = printTemplateExpressions(path, print);
  return transformCssDoc(doc, node, expressionDocs);
}