oolPref(SHOW_INFINITE_LINES),
  };
};

const reducers = {
  [UPDATE_SHOW_GRID_AREAS](highlighterSettings, { enabled }) {
    return Object.assign({}, highlighterSettings, {
      showGridAreasOverlay: enabled,
    });
  },

  [UPDATE_SHOW_GRID_LINE_NUMBERS](highlighterSettings, { enabled }) {
    return Object.assign({}, highlighterSettings, {
      showGridLineNumbers: enabled,
    });
  },

  [UPDATE_SHOW_INFINITE_LINES](highlighterSettings, { enabled }) {
    return Object.assign({}, highlighterSettings, {
      showInfiniteLines: enabled,
    });
  },
};

module.exports = function (
  highlighterSettings = INITIAL_HIGHLIGHTER_SETTINGS(),
  action
) {
  const reducer = reducers[action.type];
  if (!reducer) {
    return highlighterSettings;
  }
  return reducer(highlighterSettings, action);
};
PK