From 251193d4fcaa6cd28aeb4566129705ef9c8dcb5e Mon Sep 17 00:00:00 2001
From: Dan <dan.abramov@gmail.com>
Date: Sun, 24 Dec 2017 01:44:08 +0000
Subject: [PATCH] Fix writing stats to the file

---
 scripts/rollup/build.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/scripts/rollup/build.js b/scripts/rollup/build.js
index 7cb84e0714..1b3c0d34bb 100644
--- a/scripts/rollup/build.js
+++ b/scripts/rollup/build.js
@@ -264,13 +264,19 @@ function getPlugins(
     // Record bundle size.
     sizes({
       getSize: (size, gzip) => {
-        Stats.currentBuildResults.bundleSizes.push({
+        const currentSizes = Stats.currentBuildResults.bundleSizes;
+        const recordIndex = currentSizes.findIndex(
+          record =>
+            record.filename === filename && record.bundleType === bundleType
+        );
+        const index = recordIndex !== -1 ? recordIndex : currentSizes.length;
+        currentSizes[index] = {
           filename,
           bundleType,
           packageName,
           size,
           gzip,
-        });
+        };
       },
     }),
   ].filter(Boolean);