Bump @eslint/js from 9.39.2 to 10.0.1 in /src/playground

src/playground/eslint.config.mjs

@@ -4,8 +4,48 @@
 // @ts-check
 import eslint from "@eslint/js";
 import tseslint from "typescript-eslint";
-import notice from "eslint-plugin-notice";
 import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+import { readFileSync } from "fs";
+import { fileURLToPath } from "url";
+import { resolve, dirname } from "path";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+let copyrightTemplate;
+try {
+  copyrightTemplate = readFileSync(resolve(__dirname, "../copyright-template.js"), "utf8")
+    .replace(/\r\n/g, "\n")
+    .trimEnd();
+} catch (err) {
+  throw new Error(`Failed to read copyright template file: ${err.message}`);
+}
+
+const copyrightNoticeRule = {
+  meta: {
+    type: "problem",
+    fixable: "code",
+    messages: {
+      missingHeader: "Missing copyright notice header.",
+    },
+  },
+  create(context) {
+    return {
+      Program(node) {
+        const sourceCode = context.sourceCode;
+        const text = sourceCode.getText().replace(/\r\n/g, "\n");
+        if (!text.startsWith(copyrightTemplate)) {
+          context.report({
+            node,
+            messageId: "missingHeader",
+            fix(fixer) {
+              return fixer.insertTextBefore(node, copyrightTemplate + "\n\n");
+            },
+          });
+        }
+      },
+    };
+  },
+};
 
 export default tseslint.config({
   files: ["src/**/*.ts"],
@@ -17,13 +57,10 @@ export default tseslint.config({
   languageOptions: {
     ecmaVersion: 2020,
   },
-  plugins: { notice },
+  plugins: {
+    copyright: { rules: { notice: copyrightNoticeRule } },
+  },
   rules: {
-    "notice/notice": [
-      "error",
-      {
-        templateFile: "../copyright-template.js",
-      },
-    ],
+    "copyright/notice": "error",
   },
 });