Update eslint config file format (microsoft#1777)

In preparation for updating to eslint@9

Author: sandersn

.eslintrc.cjs

@@ -0,0 +1,41 @@
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import globals from "globals";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+    baseDirectory: __dirname,
+    recommendedConfig: js.configs.recommended,
+    allConfig: js.configs.all
+});
+
+export default [...compat.extends(
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:prettier/recommended",
+), {
+    plugins: {
+        "@typescript-eslint": typescriptEslint,
+    },
+
+    languageOptions: {
+        globals: {
+            ...globals.node,
+            ...globals.browser,
+        },
+
+        parser: tsParser,
+    },
+
+    rules: {
+        "no-prototype-builtins": 0,
+        "@typescript-eslint/no-explicit-any": 0,
+        "@typescript-eslint/no-non-null-assertion": 0,
+        "@typescript-eslint/no-var-requires": 0,
+    },
+}];