From 30423b7ffbe90a02cc78b317f19d89a2e3bb1551 Mon Sep 17 00:00:00 2001
From: Chiawen Chen <golopot@gmail.com>
Date: Fri, 20 May 2022 08:31:41 +0800
Subject: [PATCH] [Fix] `display-name`: fix false positive for HOF returning
 only nulls

---
 lib/util/Components.js          | 9 +++++++--
 tests/lib/rules/display-name.js | 9 +++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/lib/util/Components.js b/lib/util/Components.js
index 30fa7841a4..eb60d845a5 100644
--- a/lib/util/Components.js
+++ b/lib/util/Components.js
@@ -498,8 +498,13 @@ function componentRule(rule, context) {
           return undefined;
         }
 
-        // case: function any() { return (props) { return not-jsx-and-not-null } }
-        if (node.parent.type === 'ReturnStatement' && !utils.isReturningJSX(node) && !utils.isReturningOnlyNull(node)) {
+        // case: const any = () => { return (props) => null }
+        // case: const any = () => (props) => null
+        if (
+          (node.parent.type === 'ReturnStatement' || (node.parent.type === 'ArrowFunctionExpression' && node.parent.expression))
+          && !utils.isReturningJSX(node)
+          && !utils.isReturningOnlyNull(node)
+        ) {
           return undefined;
         }
 
diff --git a/tests/lib/rules/display-name.js b/tests/lib/rules/display-name.js
index 662f8e273c..be0c8442e5 100644
--- a/tests/lib/rules/display-name.js
+++ b/tests/lib/rules/display-name.js
@@ -579,6 +579,15 @@ ruleTester.run('display-name', rule, {
         }
       `,
     },
+    {
+      // issue #3289
+      code: `
+        export const demo = (a) => (b) => {
+          if (a == null) return null;
+          return b;
+        }
+      `,
+    },
   ]),
 
   invalid: parsers.all([