srecord JS(S code) implements IF0<S> {
  Set requiredLibraries;
  Set requiredLibraries() { ret requiredLibraries; }
  
  public S get() { ret code; }
  
  toString { ret unnull(code); }
  
  void requireJQuery { require("jquery"); }
  
  void require(O library) {
    requiredLibraries = addToSet_create(requiredLibraries, library);
  }
}