From 4689be2d11557f0c9001025f460351a34a204a23 Mon Sep 17 00:00:00 2001
From: Johnny Zabala <jzabala.s@gmail.com>
Date: Mon, 6 Jul 2020 18:52:06 -0400
Subject: [PATCH] [Fix]: Add check for first letter capitalization in
 functional component detection

---
 lib/util/Components.js | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/lib/util/Components.js b/lib/util/Components.js
index 3ded3e39f4..b5abdd36f2 100644
--- a/lib/util/Components.js
+++ b/lib/util/Components.js
@@ -70,6 +70,14 @@ function isReturnsLogicalJSX(node, property, strict) {
     : (returnsLogicalJSXLeft || returnsLogicalJSXRight);
 }
 
+function isFirstLetterCapitalized(word) {
+  if (!word) {
+    return false;
+  }
+  const firstLetter = word.charAt(0);
+  return firstLetter.toUpperCase() === firstLetter;
+}
+
 const Lists = new WeakMap();
 
 /**
@@ -624,13 +632,21 @@ function componentRule(rule, context) {
      * @returns {ASTNode | undefined}
      */
     getStatelessComponent(node) {
-      if (node.type === 'FunctionDeclaration') {
-        if (utils.isReturningJSXOrNull(node)) {
-          return node;
-        }
+      if (
+        node.type === 'FunctionDeclaration'
+        && isFirstLetterCapitalized(node.id.name)
+        && utils.isReturningJSXOrNull(node)
+      ) {
+        return node;
       }
 
       if (node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression') {
+        if (node.parent.type === 'VariableDeclarator' && utils.isReturningJSXOrNull(node)) {
+          if (isFirstLetterCapitalized(node.parent.id.name)) {
+            return node;
+          }
+          return undefined;
+        }
         if (utils.isInAllowedPositionForComponent(node) && utils.isReturningJSXOrNull(node)) {
           return node;
         }