Sorry I didn't think about this before: hard-coding all of these strings in the generated code will unnecessarily bloat the size of the binary, because each unique string will end up as data in the compiled output. For all languages, we should be using string interpolation so that we aren't creating N new strings constants.

And while compilers would probably handle de-duping for us if we inline them separately, it would be better not to rely on that and avoid duplicating even separate constants, so ideally we should have the generation output something like (example in Dart, but similar for the other languages):

const String channelName = "big string constant here, once";
final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
        channelName,
        codec,
        binaryMessenger: _binaryMessenger);
...
      throw PlatformException(
        code: 'channel-error',
        message:
            'Unable to establish connection on channel: "$channelName".',
      );

Makes sense, I made sure to do that in the generators themselves, but I didn't even think about it for the generateds.

This is also a general issue with the duplication of code in the generated files. Something that I'm hoping to tackle some day...