Add webpack analyzer, PR comments for webpack bundle size (#3383)

try that again 9

try that again 8

try that again 7

try that again 6

try that again 5

try that again 4

try that again 3

try that again 2

try that again

merge base 3

merge base 2

merge base

use latest main commit rather than tag

webpack diff analyzer

use cache v4

use cache

again...

blegh

blegh

try cache again

cache

try again

one more adjutment

adjust

okay again maybe

maybe now?

maybe now

oops again

oops

add diff comments

add open analyzer script

add webpack analyzer

1 files changed, 16 insertions, 0 deletions

diff --git a/webpack.config.js b/webpack.config.js
index 7515db8e9..f57ba2e36 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,6 +1,10 @@
 const createExpoWebpackConfigAsync = require('@expo/webpack-config')
 const {withAlias} = require('@expo/webpack-config/addons')
 const ReactRefreshWebpackPlugin = require('@pmmmwh/react-refresh-webpack-plugin')
+const {BundleAnalyzerPlugin} = require('webpack-bundle-analyzer')
+
+const GENERATE_STATS = process.env.EXPO_PUBLIC_GENERATE_STATS === '1'
+const OPEN_ANALYZER = process.env.EXPO_PUBLIC_OPEN_ANALYZER === '1'
 
 const reactNativeWebWebviewConfiguration = {
   test: /postMock.html$/,
@@ -26,5 +30,17 @@ module.exports = async function (env, argv) {
   if (env.mode === 'development') {
     config.plugins.push(new ReactRefreshWebpackPlugin())
   }
+
+  if (GENERATE_STATS || OPEN_ANALYZER) {
+    config.plugins.push(
+      new BundleAnalyzerPlugin({
+        openAnalyzer: OPEN_ANALYZER,
+        generateStatsFile: true,
+        statsFilename: '../stats.json',
+        analyzerMode: OPEN_ANALYZER ? 'server' : 'json',
+        defaultSizes: 'parsed',
+      }),
+    )
+  }
   return config
 }