function containsUnsupportedFunction(cssTreeNode) {
  return Boolean(
    cssTree.find(
      cssTreeNode,
      node =>
        node.type === "Function" &&
        ["clamp", "min", "max", "env"].includes(node.name)
    )
  );
}
@see csstree/csstree#164 min, max, clamp
@see csstree/csstree#245 env

@param {import('css-tree').CssNode} cssTreeNode
@returns {boolean}