lenka (npm): Typescript and javascript utilities. clone: deep copy the almost all js structures (plain objects, sets, maps, buffers, class instances etc.) with support circular/duplicate references and customizing; whatIsIt: typeof+instanceOf on steroids with support 
Keywords: deepcopy|deep copy|custom copy|deep clone|circular dependencies|circular deps|circular references|circular|typescript|es6|typeof|type of|instance of|sort of|kind-of|kind of