docs: public static void writeSrcJar(
        SoyFileSetNode soyFileSet, ImmutableMap<String, SoyFileSupplier> files, ByteSink sink)
        throws IOException {
      try (SoyJarFileWriter writer = new SoyJarFileWriter(sink.openStream())) {
        for (SoyFileNode file : soyFileSet.getChildren()) {
          String namespace = file.getNamespace();
          String fileName = file.getFileName();
          writer.writeEntry(
              Names.javaFileName(namespace, fileName),
              files.get(file.getFilePath()).asCharSource().asByteSource(UTF_8));
        }
      }
    }