chore: add/configure eslint

eslint.config.mts

@@ -0,0 +1,9 @@
+import js from "@eslint/js";
+import globals from "globals";
+import tseslint from "typescript-eslint";
+import { defineConfig } from "eslint/config";
+
+export default defineConfig([
+  { files: ["**/*.{js,mjs,cjs,ts,mts,cts}"], plugins: { js }, extends: ["js/recommended"], languageOptions: { globals: globals.browser } },
+  tseslint.configs.recommended,
+]);

package.json

@@ -16,9 +16,14 @@
   "license": "ISC",
   "type": "commonjs",
   "devDependencies": {
+    "@eslint/js": "^9.39.2",
     "@types/node": "^25.0.5",
+    "eslint": "^9.39.2",
+    "globals": "^17.0.0",
+    "jiti": "^2.6.1",
     "tsx": "^4.21.0",
-    "typescript": "^5.9.3"
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.52.0"
   },
   "dependencies": {
     "colorts": "^0.1.63",