Update ESLint stuff

The old pre-commit hook was unhappy, so I just started from scratch
based on:

https://eslint.org/docs/latest/use/getting-started#quick-start

I may need to adjust this, but I guess it's ok for now.

.pre-commit-config.yaml

@@ -39,7 +39,7 @@ repos:
       - id: eslint
         name: Run ESLint
         language: system
-        entry: npx eslint --ext .js ./templates/js
+        entry: npx eslint ./templates/js
         types: [javascript]
         pass_filenames: false
       - id: stylelint

eslint.config.mjs

@@ -0,0 +1,7 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+
+export default [
+  { languageOptions: { globals: globals.browser } },
+  pluginJs.configs.recommended,
+];

package.json

@@ -12,11 +12,13 @@
     "build": "npm-run-all build:*"
   },
   "devDependencies": {
+    "@eslint/js": "^9.9.1",
     "@playwright/test": "^1.36.0",
     "autoprefixer": "^10.4.14",
     "cssnano": "^7.0.1",
     "dotenv": "^16.3.1",
-    "eslint": "^9.0.0",
+    "eslint": "^9.9.1",
+    "globals": "^15.9.0",
     "npm-run-all": "^4.1.5",
     "postcss": "^8.4.24",
     "postcss-cli": "^11.0.0",