TypeError: t.at is not a function. (In 't.at(-1)', 't.at' is undefined

**Marked version:** **Describe the bug** Error Domain=WKErrorDomain Code=4 "A JavaScript exception occurred" UserInfo={WKJavaScriptExceptionLineNumber=67, WKJavaScriptExceptionMessage=TypeError: t.at is not a function. (In 't.at(-1)', 't.at' is undefined) Please report this to https://github.com/markedjs/marked., WKJavaScriptExceptionColumnNumber=217, WKJavaScriptExceptionSourceURL=file:///var/********/WKMarkdownView_WKMarkdownView.bundle/marked.min.js, NSLocalizedDescription=A JavaScript exception occurred} **Expected behavior**