From a4bf7dad8530222f1feb48683d0987ad29a3f4ba Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Thu, 23 Sep 2021 10:56:15 -0700
Subject: [PATCH] [Fix] `no-namespace`: fix crash on non-string
 React.createElement name

Fixes #3082
---
 CHANGELOG.md                    | 5 +++++
 lib/rules/no-namespace.js       | 4 ++--
 tests/lib/rules/no-namespace.js | 2 ++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2d440c808..05cbc962ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 
 ## Unreleased
 
+### Fixed
+* [`no-namespace`]: fix crash on non-string React.createElement name ([#3082] @ljharb)
+
+[#3082]: https://github.com/yannickcr/eslint-plugin-react/pull/3082
+
 ## [7.26.0] - 2021.09.20
 
 ### Added
diff --git a/lib/rules/no-namespace.js b/lib/rules/no-namespace.js
index 18a257592d..9b86427001 100644
--- a/lib/rules/no-namespace.js
+++ b/lib/rules/no-namespace.js
@@ -40,7 +40,7 @@ module.exports = {
       CallExpression(node) {
         if (isCreateElement(node, context) && node.arguments.length > 0 && node.arguments[0].type === 'Literal') {
           const name = node.arguments[0].value;
-          if (name.indexOf(':') === -1) return undefined;
+          if (!name || name.indexOf(':') === -1) return undefined;
           report(context, messages.noNamespace, 'noNamespace', {
             node,
             data: {
@@ -51,7 +51,7 @@ module.exports = {
       },
       JSXOpeningElement(node) {
         const name = elementType(node);
-        if (name.indexOf(':') === -1) return undefined;
+        if (!name || name.indexOf(':') === -1) return undefined;
         report(context, messages.noNamespace, 'noNamespace', {
           node,
           data: {
diff --git a/tests/lib/rules/no-namespace.js b/tests/lib/rules/no-namespace.js
index c3f6b3ef5d..bdad6b7888 100644
--- a/tests/lib/rules/no-namespace.js
+++ b/tests/lib/rules/no-namespace.js
@@ -74,6 +74,8 @@ ruleTester.run('no-namespace', rule, {
     code: '<Object.TestComponent />'
   }, {
     code: 'React.createElement("Object.TestComponent")'
+  }, {
+    code: 'React.createElement(null)'
   }],
 
   invalid: [{