From 9690bc86d5f4892e882d14e3a85ac6ee97871214 Mon Sep 17 00:00:00 2001
From: Alexander Roberts <detrohutt@gmail.com>
Date: Sun, 11 Feb 2018 07:36:02 -0600
Subject: [PATCH] Add support for new yarn workspaces config format (#4001)

---
 packages/react-dev-utils/workspaceUtils.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/react-dev-utils/workspaceUtils.js b/packages/react-dev-utils/workspaceUtils.js
index 159580e6066..5c502753ab4 100644
--- a/packages/react-dev-utils/workspaceUtils.js
+++ b/packages/react-dev-utils/workspaceUtils.js
@@ -32,7 +32,8 @@ const findPkgs = (rootPath, globPatterns) => {
 const findMonorepo = appDir => {
   const monoPkgPath = findPkg.sync(path.resolve(appDir, '..'));
   const monoPkg = monoPkgPath && require(monoPkgPath);
-  const patterns = monoPkg && monoPkg.workspaces;
+  const workspaces = monoPkg && monoPkg.workspaces;
+  const patterns = (workspaces && workspaces.packages) || workspaces;
   const isYarnWs = Boolean(patterns);
   const allPkgs = patterns && findPkgs(path.dirname(monoPkgPath), patterns);
   const isIncluded = dir => allPkgs && allPkgs.indexOf(dir) !== -1;