When using --post-build-dart-script the "temporary directory" where all built files are, are not reachable/visible. Therefore I am not able to modify the files with the dart script.

I created a new Flutter project and used the following Dart script as --post-build-dart-script :

main() {
  Directory(".").listSync(recursive: true).forEach((file) {
    if (!file.path.startsWith("./.git")) {
      print(file.path);
    }
  });
}

Within the logged files I couldn't figure out the directory, with the built files.

Maybe you can clarify on that in the README file.