Update eslint config to flat config

eslint.config.mjs

@@ -0,0 +1,31 @@
+import path from "path";
+import { fileURLToPath } from "url";
+import { FlatCompat } from "@eslint/eslintrc";
+import mjs from "@eslint/js";
+import prettierConfig from 'eslint-config-prettier';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: mjs.configs.recommended
+});
+
+export default [
+  ...compat.extends().map(
+    config => ({
+      ...config,
+      files: ["**/*.mjs", "**/*.js", "**/*.cjs"],
+      rules: {
+        ...config.rules,
+        // ...other your custom rules
+        "no-console": "warn",
+        "no-unused-vars": "warn",
+        "unused-imports/no-unused-imports": "error",
+      }
+    })
+  ),
+  prettierConfig, // Turns off all ESLint rules that have the potential to interfere with Prettier rules.
+  eslintPluginPrettierRecommended
+];