From 354f7208f3f6a13b5bb1de5e4a70a3bed43479b0 Mon Sep 17 00:00:00 2001
From: Brett Zamir <brettz9@yahoo.com>
Date: Sun, 6 Feb 2022 19:07:32 +0800
Subject: [PATCH] refactor: allow undefined keys (but not for keys argument or
 return value of `unionWith`)

---
 .eslintrc.json      | 9 +++++++++
 lib/index.js        | 2 +-
 lib/visitor-keys.js | 2 +-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/.eslintrc.json b/.eslintrc.json
index 7bea33e..851ab42 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -7,6 +7,15 @@
         "sourceType": "module",
         "ecmaVersion": 2020
     },
+    "settings": {
+        "jsdoc": {
+            "mode": "typescript",
+            "preferredTypes": {
+                "Object": "object",
+                "object<>": "Object"
+            }
+        }
+    },
     "overrides": [
         {
             "files": ["*.cjs"],
diff --git a/lib/index.js b/lib/index.js
index 747d024..93d22dc 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -22,7 +22,7 @@ function filterKey(key) {
 
 /**
  * Get visitor keys of a given node.
- * @param {Object} node The AST node to get keys.
+ * @param {object} node The AST node to get keys.
  * @returns {readonly string[]} Visitor keys of the node.
  */
 export function getKeys(node) {
diff --git a/lib/visitor-keys.js b/lib/visitor-keys.js
index c55d8f3..9b626dd 100644
--- a/lib/visitor-keys.js
+++ b/lib/visitor-keys.js
@@ -1,5 +1,5 @@
 /**
- * @type {{ readonly [type: string]: ReadonlyArray<string> }}
+ * @type {{ readonly [type: string]: ReadonlyArray<string> | undefined }}
  */
 const KEYS = {
     AssignmentExpression: [