From ef3a79bdfe6951cdb796b75580b5a72f7f8ced5b Mon Sep 17 00:00:00 2001
From: Christophe Hurpeau <christophe@hurpeau.com>
Date: Mon, 7 Sep 2020 08:49:40 +0200
Subject: [PATCH] fix: don't try to install yarn 2 from npm (#7183)

as yarn 2 is local in the project and should be started by yarn 1 via yarn config file.
When using yarn2, installing latest yarn (v1) should work best

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
---
 lib/manager/npm/post-update/yarn.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/manager/npm/post-update/yarn.ts b/lib/manager/npm/post-update/yarn.ts
index 53e243f634..667ca710e6 100644
--- a/lib/manager/npm/post-update/yarn.ts
+++ b/lib/manager/npm/post-update/yarn.ts
@@ -53,7 +53,7 @@ export async function generateLockFile(
       !isValidYarnRange || minVersion(yarnCompatibility).major === 1;
 
     let installYarn = 'npm i -g yarn';
-    if (isValidYarnRange) {
+    if (isYarn1 && isValidYarnRange) {
       installYarn += `@${quote(yarnCompatibility)}`;
     }