From 6cb6b1d6682077852b48b7eae597df58e871ed23 Mon Sep 17 00:00:00 2001
From: Dan Abramov <dan.abramov@gmail.com>
Date: Fri, 8 Nov 2019 19:41:40 +0000
Subject: [PATCH] Add yarn build --unsafe-partial (#17316)

* Add yarn build --partial

* unsafe-partial
---
 scripts/rollup/build.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/rollup/build.js b/scripts/rollup/build.js
index cc5990aa0bc6d..ff0f9760bde1d 100644
--- a/scripts/rollup/build.js
+++ b/scripts/rollup/build.js
@@ -646,7 +646,9 @@ function handleRollupError(error) {
 }
 
 async function buildEverything() {
-  await asyncRimRaf('build');
+  if (!argv['unsafe-partial']) {
+    await asyncRimRaf('build');
+  }
 
   // Run them serially for better console output
   // and to avoid any potential race conditions.