diff --git a/fixtures/attribute-behavior/src/App.js b/fixtures/attribute-behavior/src/App.js
index 3ecceaa2fd..3764349b95 100644
--- a/fixtures/attribute-behavior/src/App.js
+++ b/fixtures/attribute-behavior/src/App.js
@@ -860,7 +860,7 @@ class App extends React.Component {
         });
         break;
       default:
-        throw new Error('Switch statement should be exhuastive');
+        throw new Error('Switch statement should be exhaustive');
     }
 
     // Sort
@@ -887,7 +887,7 @@ class App extends React.Component {
         });
       }
       default:
-        throw new Error('Switch statement should be exhuastive');
+        throw new Error('Switch statement should be exhaustive');
     }
   }
 
diff --git a/packages/react-dom/src/server/escapeTextForBrowser.js b/packages/react-dom/src/server/escapeTextForBrowser.js
index 667893c5a9..2a5a91aafd 100644
--- a/packages/react-dom/src/server/escapeTextForBrowser.js
+++ b/packages/react-dom/src/server/escapeTextForBrowser.js
@@ -56,7 +56,7 @@ function escapeHtml(string) {
 
   let escape;
   let html = '';
-  let index = 0;
+  let index;
   let lastIndex = 0;
 
   for (index = match.index; index < str.length; index++) {
diff --git a/packages/react-reconciler/src/ReactFiberBeginWork.js b/packages/react-reconciler/src/ReactFiberBeginWork.js
index 73b723bf65..2ff6e03e4d 100644
--- a/packages/react-reconciler/src/ReactFiberBeginWork.js
+++ b/packages/react-reconciler/src/ReactFiberBeginWork.js
@@ -811,7 +811,7 @@ function mountLazyComponent(
       break;
     }
     default: {
-      // This message intentionally doesn't metion ForwardRef or MemoComponent
+      // This message intentionally doesn't mention ForwardRef or MemoComponent
       // because the fact that it's a separate type of work is an
       // implementation detail.
       invariant(