WIP use eslint flat config

eslint.config.mjs

@@ -0,0 +1,23 @@
+// @ts-check
+
+import eslint from "@eslint/js";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config({
+  plugins: {
+    "@typescript-eslint": tseslint.plugin,
+  },
+  languageOptions: {
+    parser: tseslint.parser,
+    parserOptions: {
+      project: true,
+    },
+  },
+  rules: {
+    "@typescript-eslint/no-unsafe-argument": "error",
+    "@typescript-eslint/no-unsafe-assignment": "error",
+    "@typescript-eslint/no-unsafe-call": "error",
+    "@typescript-eslint/no-unsafe-member-access": "error",
+    "@typescript-eslint/no-unsafe-return": "error",
+  },
+});

package.json

@@ -34,7 +34,7 @@
   },
   "scripts": {
     "build": "tsc",
-    "lint": "ESLINT_USE_FLAT_CONFIG=true eslint 'src/**/*.ts'",
+    "lint": "ESLINT_USE_FLAT_CONFIG=true eslint 'src/**/*.ts' -c eslint.config.mjs",
     "release": "yarn build && changeset publish",
     "test": "vitest"
   },