Fixed buid

packages/turndown/src/commonmark-rules.js

@@ -5,10 +5,9 @@ const htmlentities = (new Entities()).encode;
 function attributesHtml(attributes, options = null) {
   if (!attributes) return '';
 
-  options = {
+  options = Object.assign({}, {
     skipEmptyClass: false,
-    ...options,
-  };
+  }, options);
 
   const output = [];
 
@@ -425,10 +424,9 @@ rules.code = {
 }
 
 function imageMarkdownFromNode(node, options = null) {
-  options = {
+  options = Object.assign({}, {
     preserveImageTagsWithSize: false,
-    ...options,
-  };
+  }, options);
 
   if (options.preserveImageTagsWithSize && (node.getAttribute('width') || node.getAttribute('height'))) {
     return node.outerHTML;