chore: update ESLint configuration with new rules and plugins

.eslintrc.js

@@ -2,15 +2,15 @@ module.exports = {
   env: {
     es2021: true,
     node: true,
-    jest: true
-  },
-  extends: "eslint:recommended",
-  parserOptions: {
-    ecmaVersion: "latest",
-    sourceType: "module"
+    jest: true,
   },
+  files: ["**/*.js"],
+  plugins: { js },
+  extends: ["js/recommended"],
   rules: {
-    // add custom rules or overrides here, e.g.:
-    // "no-console": "warn"
-  }
+    "no-unused-vars": "warn",
+    "prefer-const": "error",
+    eqeqeq: "error",
+    semi: ["error", "always"],
+  },
 };