From bb5f1dfb306fe5ed7ecc66d4d2471847720b5c4d Mon Sep 17 00:00:00 2001
From: Marcos Ojeda <subliminal@gmail.com>
Date: Fri, 28 Apr 2017 10:11:10 -0700
Subject: [PATCH] adjacent returns false if keys are undefined

it's possible for `VisitorKeys` for a parent type to return `undefined` causing the subsequent iteration to fail. this bails early when that happens.
---
 esquery.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/esquery.js b/esquery.js
index d4d9fea..1006262 100644
--- a/esquery.js
+++ b/esquery.js
@@ -226,6 +226,7 @@
             var parent = ancestry[0], listProp, keys, i, l, idx;
             if (!parent) { return false; }
             keys = estraverse.VisitorKeys[parent.type];
+            if (!keys) { return false; }
             for (i = 0, l = keys.length; i < l; ++i) {
                 listProp = parent[keys[i]];
                 if (isArray(listProp)) {