perf: remove stats.json generation in webpack (mastodon#10290)

* perf: remove stats.json generation in webpack

* fix code comment

Author: nolanlawson

config/webpack/production.js

@@ -57,13 +57,8 @@ module.exports = merge(sharedConfig, {
       cache: true,
       test: /\.(js|css|html|json|ico|svg|eot|otf|ttf|map)$/,
     }),
-    new BundleAnalyzerPlugin({ // generates report.html and stats.json
+    new BundleAnalyzerPlugin({ // generates report.html
       analyzerMode: 'static',
-      generateStatsFile: true,
-      statsOptions: {
-        // allows usage with http://chrisbateman.github.io/webpack-visualizer/
-        chunkModules: true,
-      },
       openAnalyzer: false,
       logLevel: 'silent', // do not bother Webpacker, who runs with --json and parses stdout
     }),