Under normal circumstances, TypeScript is not “blank”:
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What Theme are you using? Default (stylers.xml) or one of the other Themes?
Please note that themes and stylers.xml aren’t updated automatically when you update Notepad++, so your theme might be out of date, as described in the themes section of the user manual . But some themes, even fully up-to-date, are missing many of the Languages that stylers.xml or the DarkModeDefault theme provide. In that case, I recommend using Plugins > Plugins Admin to install the ConfigUpdater plugin, which can find any languages that are missing from your theme and put in dummy values; after a restart of the app, there will at least be entries, even if the colors aren’t the best or necessarily distinguished from each other.