mw.util.jsMessage
Hi, Twinkle uses
mw.util.jsMessage() to show the user an error message. This function was deprecated in 2012, and will soon not be working. There's a migration guide that explains how to use mw.notify instead. See phab:T193901 for more information. This isn't a big issue. /Johan (WMF) (bincang) 09:10, 26 November 2018 (UTC)