[create-next-app] update logic for shouldUseYarn function (#11683)

Co-authored-by: Joe Haddad <[email protected]>
vercel · Apr 6, 2020 · eec18ec · eec18ec
1 parent b91ee11
commit eec18ec
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/packages/create-next-app/helpers/should-use-yarn.ts b/packages/create-next-app/helpers/should-use-yarn.ts
@@ -2,6 +2,10 @@ import { execSync } from 'child_process'
 
 export function shouldUseYarn() {
   try {
+    const userAgent = process.env.npm_config_user_agent
+    if (userAgent) {
+      return Boolean(userAgent && userAgent.startsWith('yarn'))
+    }
     execSync('yarnpkg --version', { stdio: 'ignore' })
     return true
   } catch (e) {