From cc1d517fafb0d1fcf6bf24a8fe011f508ad5f22d Mon Sep 17 00:00:00 2001
From: Jonathan Neal <jonathantneal@hotmail.com>
Date: Thu, 8 Oct 2020 09:33:20 -0400
Subject: [PATCH] Preserve Custom Properties

---
 packages/core/src/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 97c9ffdb..9117c5a4 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -266,7 +266,7 @@ const processStyleObject = (
  * borderColor => border-color
  */
 const hyphenAndVendorPrefixCssProp = (cssProp: string, vendorProps: any[], vendorPrefix: string) => {
-  const isVendorPrefixed = cssProp[0] === cssProp[0].toUpperCase();
+  const isVendorPrefixed = /^[A-Z]/.test(cssProp);
   let cssHyphenProp = cssProp
     .split(/(?=[A-Z])/)
     .map((g) => g.toLowerCase())