@WebStormIDE Hey Guys, what is this? I get a lot of those after last update.pic.twitter.com/eCgOzHSZFL
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Or you can disable the highlighting (but leave the tooltip) in Preferences | Editor | Color Scheme | TypeScript - Variable type narrowed by a type guard. You can also vote for an issue for having the highlighting turned off: https://youtrack.jetbrains.com/issue/WEB-40165 We'd appreciate your feedback!