From fff2d7585b2acb42fca505c38ffa91ff62107144 Mon Sep 17 00:00:00 2001
From: Jirat Ki <saakyz@gmail.com>
Date: Mon, 25 Nov 2019 11:16:09 +0800
Subject: [PATCH] Fix error when providing babel/preset-env without options

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

diff --git a/src/babelPluginTsdx.ts b/src/babelPluginTsdx.ts
index 628efe13f..249f29e8a 100644
--- a/src/babelPluginTsdx.ts
+++ b/src/babelPluginTsdx.ts
@@ -120,7 +120,7 @@ export const babelPluginTsdx = babelPlugin.custom((babelCore: any) => ({
               modules: false,
               exclude: merge(
                 ['transform-async-to-generator', 'transform-regenerator'],
-                preset.options.exclude || []
+                (preset.options && preset.options.exclude) || []
               ),
             }
           ),