sinterface IResourceLoader {
  S loadSnippet(S snippetID);
  S getTranspiled(S snippetID); // with libs
  int getSnippetType(S snippetID);
  S getSnippetTitle(S snippetID);
  File loadLibrary(S snippetID);
  File pathToJavaXJar();
  File getSnippetJar(S snippetID, S transpiledSrc); // may return null, then caller compiles themselves
}