enum LogLevel {
  "debug",
  "info",
  "warn",
  "error"
};

callback Comparator = long (DOMString a, DOMString b);

interface ConfigOptions { };

[Exposed=Window]
namespace MyLibrary {
  const unsigned short VERSION_MAJOR = 1;
  const unsigned short VERSION_MINOR = 4;

  void initialize();
  DOMString stringify(object input);
  Promise<any> fetchResource(DOMString url);

  void log(DOMString message);
  void log(DOMString message, LogLevel level);

  ConfigOptions getDefaultConfig();

  void forEach(sequence<DOMString> items, Comparator compareFn);
};