My ~/Library/Developer folder - what resides there ? Can it be deleted ?

That folderhas 12GB but have no clarity what is there and if it can be deleted.
gogled a bit but could not find a lot of useful info.
Looking for more space in my Air . I do develop so do not want to delete anything needed / useful but 12GB sounds like a lot !
Might not be legacy data ? Is there any what to streamline what its there ?
Thanks

Downloaded DocSets, your Xcode user preferences, derived data from builds of projects you have created (by default...maybe you have moved them elsewhere), including intermediates formats, iOS device logs...
In other words, probably not something you want to delete wholesale.

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Hi Frank,
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The computer is MacBook pro 2010 and there is no warranty. I am looking for a solution to avoid the, possibly, colossal repair cost.
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