Migrate from .eslintignore to eslint.config.js file

.eslintignore is now deprecated, so I have migrated that file to eslint.config.js as per https://eslint.org/docs/latest/use/configure/migration-guide

eslint.config.mjs

@@ -0,0 +1,23 @@
+import globals from "globals";
+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 [{
+    ignores: ["log/", "tmp/", "vendor/", "public/assets", "coverage"],
+}, ...compat.extends("eslint:recommended", "prettier"), {
+    languageOptions: {
+        globals: {
+            ...globals.browser,
+        },
+    },
+}];