src/language-handlebars/printer-glimmer.js/printChildren
function printChildren(path, options, print) {
  const node = path.getValue();
  const isEmpty = node.children.every((node) => isWhitespaceNode(node));
  if (options.htmlWhitespaceSensitivity === "ignore" && isEmpty) {
    return "";
  }

  return path.map((childPath, childIndex) => {
    const printedChild = print();

    if (childIndex === 0 && options.htmlWhitespaceSensitivity === "ignore") {
      return [softline, printedChild];
    }

    return printedChild;
  }, "children");
}