chore: update to eslint v9

eslint.config.mjs

@@ -0,0 +1,40 @@
+// Import Node.js Dependencies
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+// Import Third-party Dependencies
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname
+});
+
+export default [
+  {
+    ignores: [
+      "**/node_modules/",
+      "**/tmp/",
+      "**/dist/",
+      "**/coverage/",
+      "**/fixtures/"
+    ]
+  },
+  ...compat.extends("@nodesecure/eslint-config"),
+  {
+    languageOptions: {
+      sourceType: "module",
+      parserOptions: {
+        requireConfigFile: false
+      }
+    },
+    rules: {
+      "func-style": "off",
+      "no-invalid-this": "off",
+      "no-inner-declarations": "off",
+      "no-case-declarations": "off"
+    }
+  }
+];

package.json

@@ -15,7 +15,7 @@
     "test": "npm run test-only && npm run test:tsd",
     "test:tsd": "npm run build && tsd",
     "coverage": "c8 -r html npm test",
-    "lint": "cross-env eslint src/*.ts"
+    "lint": "eslint src/**/*.ts"
   },
   "repository": {
     "type": "git",
@@ -36,13 +36,12 @@
   },
   "homepage": "https://github.com/NodeSecure/rc#readme",
   "devDependencies": {
-    "@nodesecure/eslint-config": "^1.8.0",
+    "@nodesecure/eslint-config": "^2.0.0-beta.0",
     "@types/lodash.merge": "^4.6.7",
     "@types/node": "^22.0.0",
     "@types/zen-observable": "^0.8.4",
     "ajv": "^8.12.0",
     "c8": "^10.1.2",
-    "eslint": "^9.2.0",
     "glob": "^11.0.0",
     "tsd": "^0.31.0",
     "tsx": "^4.9.3",