From 4a699c09a686924f350b639d8d6c3a835c01ea8c Mon Sep 17 00:00:00 2001
From: Sebastian Silbermann <silbermann.sebastian@gmail.com>
Date: Mon, 31 Aug 2020 11:26:18 +0200
Subject: [PATCH] stricter HTMLElementType

---
 packages/material-ui-utils/src/HTMLElementType.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/material-ui-utils/src/HTMLElementType.ts b/packages/material-ui-utils/src/HTMLElementType.ts
index 618ac8f96e5902..f36ca5437fc13f 100644
--- a/packages/material-ui-utils/src/HTMLElementType.ts
+++ b/packages/material-ui-utils/src/HTMLElementType.ts
@@ -1,10 +1,10 @@
 export default function HTMLElementType(
-  props: { [key: string]: any },
+  props: { [key: string]: unknown },
   propName: string,
   componentName: string,
   location: string,
   propFullName: string,
-) {
+): Error | null {
   if (process.env.NODE_ENV === 'production') {
     return null;
   }
@@ -16,7 +16,7 @@ export default function HTMLElementType(
     return null;
   }
 
-  if (propValue && propValue.nodeType !== 1) {
+  if (propValue && (propValue as any).nodeType !== 1) {
     return new Error(
       `Invalid ${location} \`${safePropName}\` supplied to \`${componentName}\`. ` +
         `Expected an HTMLElement.`,