+-- extract Uri out from DocumentChange
+-- didn't put this in `lsp-types` because TH was getting in the way
+documentChangeUri :: DocumentChange -> Uri
+documentChangeUri (InL x) = x ^. textDocument . uri
+documentChangeUri (InR (InL x)) = x ^. uri
+documentChangeUri (InR (InR (InL x))) = x ^. oldUri
+documentChangeUri (InR (InR (InR x))) = x ^. uri
+