I think maybe the idea of all these transpilers is to keep the generated code readable and as close to the original code as possible. Mangling names into unreadable garbage is not difficult, but that would also make the the transpiler act more like an obfuscator, which is probably what the authors want to avoid.

Protobuf has similar problem: whatever names you use for your proto messages should be translated to the target language as is, and with multiple target languages, chances are that you'll hit a keyword in one of them; each language plugin should figure out how to resolve this.

  $ cat test.proto
  syntax = "proto3";
  
  package test;
  
  message TestMessage {
    int32 register = 1;
    int32 foo = 2;
  }
  
  $ protoc --cpp_out=. test.proto
  
  $ grep 'register\|foo' test.pb.cc | head -n 2
        : register__{0},
          foo_{0},

(I may understand `register__`, but why `foo_`? no idea)