diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 42fda3817c..20058c871c 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -21,6 +21,14 @@ const config = {
 
   rules: {
     // Insert changed or disabled rules here, if necessary.
+
+    // @template-customization-start
+
+    // Docusaurus is stuck on ESM. Remove this when "package.json" can be converted:
+    // https://github.com/facebook/docusaurus/issues/6520
+    "n/file-extension-in-import": "off",
+
+    // @template-customization-end
   },
 };
 
diff --git a/src/beginnersGuide.tsx b/src/beginnersGuide.tsx
index 1f99de54f2..60600dd8c3 100644
--- a/src/beginnersGuide.tsx
+++ b/src/beginnersGuide.tsx
@@ -2,7 +2,7 @@ import { useEffect } from "react";
 import { CircularProgressbar } from "react-circular-progressbar";
 import "react-circular-progressbar/dist/styles.css"; // eslint-disable-line import/no-unassigned-import, @typescript-eslint/no-restricted-imports
 import sidebars from "../sidebars";
-import { isObject } from "./utils.js";
+import { isObject } from "./utils";
 
 const BEGINNERS_GUIDE_PARTS: readonly string[] = (() => {
   const { mainSidebar } = sidebars;