external getLogger :
  unit ->
    <
      log: 'a -> unit (a:1)  ;log2: 'a . int -> int (a:1)  ;log3: 'a 'b .
                                                                    'a ->
                                                                    'b -> int (a:2)
                                                                >  (a:1) =
    "./src/logger.mock.js"