From e4a777f825066bff26ba246ef4e48025caf71a26 Mon Sep 17 00:00:00 2001
From: Michael Gmelin <freebsd@grem.de>
Date: Tue, 9 Oct 2018 12:37:38 +0200
Subject: [PATCH] Environment variable prefixes should start at the beginning,
 not in the middle of an environment variable. This fixes this example:

  SOME_YARN_CONFIG=123 yarn config list | grep some
    'some-yarn-config':
  { 'some-yarn-config':
---
 src/registries/base-registry.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/registries/base-registry.js b/src/registries/base-registry.js
index 87cdfce385..1f55448a23 100644
--- a/src/registries/base-registry.js
+++ b/src/registries/base-registry.js
@@ -151,7 +151,7 @@ export default class BaseRegistry {
       let key = envKey.toLowerCase();
 
       // only accept keys prefixed with the prefix
-      if (key.indexOf(prefix.toLowerCase()) < 0) {
+      if (key.indexOf(prefix.toLowerCase()) !== 0) {
         continue;
       }