From ddcc69c83b59ef0f895aa5020196e2ae9de36133 Mon Sep 17 00:00:00 2001
From: Rohith Srivathsav <rohithroxtar@gmail.com>
Date: Sun, 10 May 2020 06:22:11 +0530
Subject: [PATCH] Added clear message for functional component starting with
 lowercase (#18881)

---
 .../__tests__/ESLintRulesOfHooks-test.js                       | 3 ++-
 packages/eslint-plugin-react-hooks/src/RulesOfHooks.js         | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/eslint-plugin-react-hooks/__tests__/ESLintRulesOfHooks-test.js b/packages/eslint-plugin-react-hooks/__tests__/ESLintRulesOfHooks-test.js
index 12c4f8ffb7..2f12ee3d71 100644
--- a/packages/eslint-plugin-react-hooks/__tests__/ESLintRulesOfHooks-test.js
+++ b/packages/eslint-plugin-react-hooks/__tests__/ESLintRulesOfHooks-test.js
@@ -916,7 +916,8 @@ function functionError(hook, fn) {
   return {
     message:
       `React Hook "${hook}" is called in function "${fn}" that is neither ` +
-      'a React function component nor a custom React Hook function.',
+      'a React function component nor a custom React Hook function.' +
+      ' React component names must start with an uppercase letter.',
   };
 }
 
diff --git a/packages/eslint-plugin-react-hooks/src/RulesOfHooks.js b/packages/eslint-plugin-react-hooks/src/RulesOfHooks.js
index dda5a1ee3c..4e47a81e51 100644
--- a/packages/eslint-plugin-react-hooks/src/RulesOfHooks.js
+++ b/packages/eslint-plugin-react-hooks/src/RulesOfHooks.js
@@ -481,7 +481,8 @@ export default {
                 `React Hook "${context.getSource(hook)}" is called in ` +
                 `function "${context.getSource(codePathFunctionName)}" ` +
                 'that is neither a React function component nor a custom ' +
-                'React Hook function.';
+                'React Hook function.' +
+                ' React component names must start with an uppercase letter.';
               context.report({node: hook, message});
             } else if (codePathNode.type === 'Program') {
               // These are dangerous if you have inline requires enabled.