From c65b79ecd8068fc432707e6246c4b41274f3a44b Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Mon, 29 Jun 2020 13:09:58 -0700
Subject: [PATCH] [Fix] `jsx-pascal-case`: fix a false positive with "H1"

Fixes #2683; caused by #2636.
---
 lib/rules/jsx-pascal-case.js       | 20 ++++++++++----------
 tests/lib/rules/jsx-pascal-case.js |  2 ++
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/lib/rules/jsx-pascal-case.js b/lib/rules/jsx-pascal-case.js
index c8be42538e..03e3602fd8 100644
--- a/lib/rules/jsx-pascal-case.js
+++ b/lib/rules/jsx-pascal-case.js
@@ -28,17 +28,17 @@ function testPascalCase(name) {
   if (!testUpperCase(name.charAt(0))) {
     return false;
   }
-  let atLeastOneLowerCase = false;
-  for (let i = 1; i < name.length; i += 1) {
-    const char = name.charAt(i);
-    if (!(char.toLowerCase() !== char.toUpperCase() || testDigit(char))) {
-      return false;
-    }
-    if (!atLeastOneLowerCase) {
-      atLeastOneLowerCase = testLowerCase(char);
-    }
+  const anyNonAlphaNumeric = Array.prototype.some.call(
+    name.slice(1),
+    (char) => char.toLowerCase() === char.toUpperCase() && !testDigit(char)
+  );
+  if (anyNonAlphaNumeric) {
+    return false;
   }
-  return atLeastOneLowerCase;
+  return Array.prototype.some.call(
+    name.slice(1),
+    (char) => testLowerCase(char) || testDigit(char)
+  );
 }
 
 function testAllCaps(name) {
diff --git a/tests/lib/rules/jsx-pascal-case.js b/tests/lib/rules/jsx-pascal-case.js
index af9d914d55..beb12f85c7 100644
--- a/tests/lib/rules/jsx-pascal-case.js
+++ b/tests/lib/rules/jsx-pascal-case.js
@@ -80,6 +80,8 @@ ruleTester.run('jsx-pascal-case', rule, {
     code: '<$ />'
   }, {
     code: '<_ />'
+  }, {
+    code: '<H1>Hello!</H1>'
   }],
 
   invalid: [{