SUMMARY For "react-js" developers, it is common to have JSX code in javascript files mixed with javascript syntax. Currently, JSX doesn't get highlighted at all if the file has ".js" extension OBSERVED RESULT JSX code in javascript files doesn't get highlighted EXPECTED RESULT JSX code in javascript files gets highlighted
This is configurable (for Kate) in Settings -> Configure Kate -> Open/Save -> Modes & Filetypes -> File extensions
Yes, you can configure this, we can't just use the JSX highlighting for JS files per default.