Upgrade to ESLint 9

eslint.config.js

@@ -1,3 +1,4 @@
+import { fixupPluginRules } from '@eslint/compat';
 import eslintJs from '@eslint/js';
 import eslintConfigPrettier from 'eslint-config-prettier';
 import eslintConfigReactApp from 'eslint-config-react-app';
@@ -33,9 +34,9 @@ const eslintConfig = [
   {
     plugins: {
       // These plugins are all needed for eslint-config-react-app
-      flowtype: eslintPluginFlowtype,
+      flowtype: fixupPluginRules(eslintPluginFlowtype),
       'jsx-a11y': eslintPluginJsxA11y,
-      import: eslintPluginImport,
+      import: fixupPluginRules(eslintPluginImport),
       'react-hooks': eslintPluginReactHooks,
     },
     linterOptions: {

package.json

@@ -70,6 +70,7 @@
   "devDependencies": {
     "@arethetypeswrong/cli": "0.16.0",
     "@changesets/cli": "2.27.7",
+    "@eslint/compat": "1.1.1",
     "@size-limit/preset-small-lib": "11.1.4",
     "@testing-library/jest-dom": "6.4.6",
     "@testing-library/react": "16.0.0",
@@ -81,7 +82,7 @@
     "changesets-format-with-issue-links": "0.3.0",
     "cross-env": "7.0.3",
     "downlevel-dts": "0.11.0",
-    "eslint": "8.57.0",
+    "eslint": "9.7.0",
     "eslint-config-prettier": "9.1.0",
     "eslint-config-react-app": "7.0.1",
     "eslint-plugin-react": "7.34.3",