return options

lib/index.js

@@ -48,6 +48,7 @@ this.singlefile = this.singlefile || {
 			[options.frames] = await Promise.all(preInitializationPromises);
 			options.doc = doc;
 			options.win = win;
+			return options;
 		},
 		getPageData: async function (options = {}, classOptions) {
 			options.insertSingleFileComment = true;