fix: yarn detection with nps (#441)

lingui · Jan 25, 2019 · 62c8cc0 · 62c8cc0
1 parent caccfe6
commit 62c8cc0
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/packages/cli/src/api/help.js b/packages/cli/src/api/help.js
@@ -25,5 +25,7 @@ try {
 } catch (e) {
   commands = ["run"]
 }
-const isYarn = process.env.npm_config_user_agent.includes("yarn")
+const isYarn =
+  process.env.npm_config_user_agent &&
+  process.env.npm_config_user_agent.includes("yarn")
 const preCommand = [isYarn ? "yarn" : "npm", ...commands].join(" ")