The tooltip should show types when you're hovering over the implementation of a function depending on what it is. It doesn't work on type signatures, though. Does it work in some places, or nowhere in your source file? Check the buildwrapper console for your project after turning on debug mode in the preferences and check if there are any error there.
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the showing function type when mouse is on a function is working originally. but it always null. could you tell me how to fix that.
The tooltip should show types when you're hovering over the implementation of a function depending on what it is. It doesn't work on type signatures, though. Does it work in some places, or nowhere in your source file? Check the buildwrapper console for your project after turning on debug mode in the preferences and check if there are any error there.