static O hotwire_onCompile; // voidfunc(Pair<jarFile, transpiledSource>)
sbool hotwire_serially;
static Lock hotwire_overInternalBot_lock = lock();

static Class<?> hotwire_overInternalBot(S progID) {
  ret hotwire_overInternalBot(progID, "main");
}

static Class<?> hotwire_overInternalBot(S progID, S mainClass) ctex {
  Pair<File, S> p = CompilerBot.compileSnippet2(progID);
  lock hotwire_serially ? hotwire_overInternalBot_lock : null;
  callF(hotwire_onCompile, p);
  File jar = p.a;
  assertTrue(jar.getAbsolutePath(), jar.isFile());
  
  // collect files (program + libraries)
  
  L<File> files = ll(jar);
  S dehlibs;
  try {
    dehlibs = unnull(loadTextFileFromZip(jar, "libraries"));
  } catch e {
    jar.delete();
    throw rethrow(e);
  }
  
  Matcher matcher = Pattern.compile("\\d+").matcher(dehlibs);
  while (matcher.find()) {
    S libID = matcher.group();
    files.add(loadLibrary(libID));
  }

  // make class loader
  JavaXClassLoader classLoader = hotwire_makeClassLoader(files);
  classLoader.progID = progID;
  
  ret hotwire_finish(classLoader, progID, p.b, mainClass);
}