$ clang-tidy '--checks=-*,modernize-use-using' --fix a.cpp
2 warnings generated.
/tmp/a.cpp:1:1: warning: use 'using' instead of 'typedef' [modernize-use-using]
    1 | typedef const int T;
      | ^~~~~~~~~~~~~~~~~~~
      | using T = int
/tmp/a.cpp:2:1: warning: use 'using' instead of 'typedef' [modernize-use-using]
    2 | typedef volatile int U;
      | ^~~~~~~~~~~~~~~~~~~~~~
      | using U = int