message: feat(feed2): detect ouput options
diff: @@ -22,6 +22,14 @@ export const feedPlugin: Plugin<FeedOptions> = (options, app) => {
  const feedOptions = options as FeedOptions;
  const channelOptions = getFeedChannelOption(app, feedOptions);
  + if (!feedOptions.atom && !feedOptions.json && !feedOptions.rss) {
  + logger.info("No requested output, the plugin won't start!");
  +
  + return {
  + name: "vuepress-plugin-feed2",
  + };
  + }
  +
  return {
  name: "vuepress-plugin-feed2",
  