Migrate to new config format

eslint.config.mjs

@@ -0,0 +1,43 @@
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import globals from "globals";
+import tsParser from "@typescript-eslint/parser";
+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: ["**/dist", "**/.eslintrc.js"],
+  },
+  ...compat.extends(
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier",
+  ),
+  {
+    plugins: {
+      "@typescript-eslint": typescriptEslint,
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+      },
+
+      parser: tsParser,
+      ecmaVersion: 13,
+      sourceType: "module",
+    },
+
+    rules: {},
+  },
+];

package.json

@@ -15,10 +15,13 @@
   "author": "",
   "license": "MIT",
   "devDependencies": {
+    "@eslint/eslintrc": "^3.1.0",
+    "@eslint/js": "^9.8.0",
     "@typescript-eslint/eslint-plugin": "8.0.0",
     "@typescript-eslint/parser": "8.0.0",
     "eslint": "9.8.0",
     "eslint-config-prettier": "9.1.0",
+    "globals": "^15.9.0",
     "prettier": "3.3.3",
     "ts-node": "10.9.2",
     "typescript": "5.5.4"
@@ -29,5 +32,6 @@
   },
   "dependencies": {
     "@slack/bolt": "3.19.0"
-  }
+  },
+  "packageManager": "[email protected]+sha1.ac34549e6aa8e7ead463a7407e1c7390f61a6610"
 }