From 5f3271aaea9e780563dbc6d41c09bac2f58ceb1c Mon Sep 17 00:00:00 2001
From: David Lechner <david@pybricks.com>
Date: Wed, 22 Dec 2021 12:03:06 -0600
Subject: [PATCH] craco: fix env substitution for undefined variable

When an environment variable is not defined, `process.env` returns
`undefined` which was used literally as text. Fix by using an empty
string if `process.env` returns something falsy.

Fixes: https://github.com/pybricks/support/issues/560
---
 craco.config.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/craco.config.js b/craco.config.js
index b92fc342..e4a5eac8 100644
--- a/craco.config.js
+++ b/craco.config.js
@@ -198,7 +198,7 @@ module.exports = {
                                 .toString()
                                 .replace(
                                     /%\w+%/g,
-                                    (m) => process.env[m.slice(1, m.length - 1)],
+                                    (m) => process.env[m.slice(1, m.length - 1)] || '',
                                 );
                         },
                     },