From 973b027df64511b0123389ac9e87c350916d76b7 Mon Sep 17 00:00:00 2001
From: Chiawen Chen <golopot@gmail.com>
Date: Sun, 8 Sep 2019 01:25:54 +0800
Subject: [PATCH] Move a function to jsxUtils

---
 lib/rules/jsx-no-useless-fragment.js |  7 +------
 lib/util/jsx.js                      | 14 +++++++++++++-
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/lib/rules/jsx-no-useless-fragment.js b/lib/rules/jsx-no-useless-fragment.js
index fb05be1c4c..22ae071e29 100644
--- a/lib/rules/jsx-no-useless-fragment.js
+++ b/lib/rules/jsx-no-useless-fragment.js
@@ -60,12 +60,7 @@ function trimLikeReact(text) {
 function isKeyedElement(node) {
   return node.type === 'JSXElement' &&
     node.openingElement.attributes &&
-    node.openingElement.attributes.some(attribute => (
-      attribute.type === 'JSXAttribute' &&
-      attribute.name &&
-      attribute.name.type === 'JSXIdentifier' &&
-      attribute.name.name === 'key'
-    ));
+    node.openingElement.attributes.some(jsxUtil.isJSXAttributeKey);
 }
 
 module.exports = {
diff --git a/lib/util/jsx.js b/lib/util/jsx.js
index d5f69dba69..d694becc61 100644
--- a/lib/util/jsx.js
+++ b/lib/util/jsx.js
@@ -64,8 +64,20 @@ function isJSX(node) {
   return node && ['JSXElement', 'JSXFragment'].indexOf(node.type) >= 0;
 }
 
+/**
+ * Check if node is like `key={...}` as in `<Foo key={...} />`
+ * @param {ASTNode} node
+ */
+function isJSXAttributeKey(node) {
+  return node.type === 'JSXAttribute' &&
+    node.name &&
+    node.name.type === 'JSXIdentifier' &&
+    node.name.name === 'key';
+}
+
 module.exports = {
   isDOMComponent,
   isFragment,
-  isJSX
+  isJSX,
+  isJSXAttributeKey
 };