From 7dd54a2da56ac46a1764b277339a2195b437a32f Mon Sep 17 00:00:00 2001
From: Sam Saccone <samccone@gmail.com>
Date: Sun, 5 Apr 2020 13:19:13 -0700
Subject: [PATCH] Add back in --stats output from webpack.

This commit is a manual revert of the following commits:
https://github.com/facebook/create-react-app/commit/e7a427ad161b7b58868409d99307d8b68fad1335
https://github.com/facebook/create-react-app/commit/140e182e7d7fbeb8d507b6be4813a4ce0bf9b6d8

And a re-introduction of
https://github.com/facebook/create-react-app/commit/7c8593845830c585a780f4e40268e7b4f442c7a4

Fixes: https://github.com/facebook/create-react-app/issues/8789
Fixes: https://github.com/facebook/create-react-app/issues/6904

Tested:

Manually ran yarn link and then ran yarn build from a 3.x version of CRA
with react-scripts linked in from this patch.

Verification:
Saw that a bundle-stats.json file was written out where as before in the
pre-linked version it was not.
---
 packages/react-scripts/package.json     |  1 +
 packages/react-scripts/scripts/build.js | 17 +++++++++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/packages/react-scripts/package.json b/packages/react-scripts/package.json
index 63e7faf390c..4f6ee11625b 100644
--- a/packages/react-scripts/package.json
+++ b/packages/react-scripts/package.json
@@ -37,6 +37,7 @@
     "babel-loader": "8.1.0",
     "babel-plugin-named-asset-import": "^0.3.6",
     "babel-preset-react-app": "^9.1.2",
+    "bfj": "^7.0.2",
     "camelcase": "^5.3.1",
     "case-sensitive-paths-webpack-plugin": "2.3.0",
     "css-loader": "3.4.2",
diff --git a/packages/react-scripts/scripts/build.js b/packages/react-scripts/scripts/build.js
index fa30fb09a3f..b51df86101b 100644
--- a/packages/react-scripts/scripts/build.js
+++ b/packages/react-scripts/scripts/build.js
@@ -34,6 +34,7 @@ verifyTypeScriptSetup();
 const path = require('path');
 const chalk = require('react-dev-utils/chalk');
 const fs = require('fs-extra');
+const bfj = require('bfj');
 const webpack = require('webpack');
 const configFactory = require('../config/webpack.config');
 const paths = require('../config/paths');
@@ -59,6 +60,9 @@ if (!checkRequiredFiles([paths.appHtml, paths.appIndexJs])) {
   process.exit(1);
 }
 
+const argv = process.argv.slice(2);
+const writeStatsJson = argv.indexOf('--stats') !== -1;
+
 // Generate configuration
 const config = configFactory('production');
 
@@ -210,11 +214,20 @@ function build(previousFileSizes) {
         return reject(new Error(messages.warnings.join('\n\n')));
       }
 
-      return resolve({
+      const resolveArgs = {
         stats,
         previousFileSizes,
         warnings: messages.warnings,
-      });
+      };
+
+      if (writeStatsJson) {
+        return bfj
+          .write(paths.appBuild + '/bundle-stats.json', stats.toJson())
+          .then(() => resolve(resolveArgs))
+          .catch(error => reject(new Error(error)));
+      }
+
+      return resolve(resolveArgs);
     });
   });
 }