function getPluginName(hotInstance, plugin) {
  var pluginName = null;

  if (registeredPlugins.has(hotInstance)) {
    (0, _object.objectEach)(registeredPlugins.get(hotInstance), function (pluginInstance, name) {
      if (pluginInstance === plugin) {
        pluginName = name;
      }
    });
  }

  return pluginName;
}
Get plugin name.

@param {Object} hotInstance
@param {Object} plugin
@returns {String|null}