update

node_modules/validator/es/lib/util/toString.js

@@ -0,0 +1,15 @@
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+export default function toString(input) {
+  if (_typeof(input) === 'object' && input !== null) {
+    if (typeof input.toString === 'function') {
+      input = input.toString();
+    } else {
+      input = '[object Object]';
+    }
+  } else if (input === null || typeof input === 'undefined' || isNaN(input) && !input.length) {
+    input = '';
+  }
+
+  return String(input);
+}