From 9ba9bf80780c0bd9c3dba555fc8fbafdb6beef28 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <i@jhuang.me>
Date: Sun, 22 Sep 2019 17:20:03 -0400
Subject: [PATCH] fix: add default value when skipKeys is falsy

---
 packages/babel-traverse/src/index.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/babel-traverse/src/index.js b/packages/babel-traverse/src/index.js
index 8e84b23eb79b..c2626543e8a7 100644
--- a/packages/babel-traverse/src/index.js
+++ b/packages/babel-traverse/src/index.js
@@ -59,6 +59,9 @@ traverse.node = function(
   const keys: Array = t.VISITOR_KEYS[node.type];
   if (!keys) return;
 
+  if (!skipKeys) {
+    skipKeys = {};
+  }
   let skipKeysSet;
   const skipKeysKeys = Object.keys(skipKeys);
   if (skipKeysKeys.length > 0) {