fix: avoid mixing CJS require in ESM modules (rjsf-team#2028)

* fix: avoid mixing CJS require in ESM modules fixes rjsf-team#1893 * Update utils.js Co-authored-by: Ashwin Ramaswami <aramaswamis@gmail.com>

Author: kuwoyuki

packages/core/src/utils.js

@@ -2,9 +2,11 @@ import React from "react";
 import * as ReactIs from "react-is";
 import mergeAllOf from "json-schema-merge-allof";
 import fill from "core-js/library/fn/array/fill";
-import validateFormData, { isValid } from "./validate";
 import union from "lodash/union";
 import jsonpointer from "jsonpointer";
+import fields from "./components/fields";
+import widgets from "./components/widgets";
+import validateFormData, { isValid } from "./validate";
 
 export const ADDITIONAL_PROPERTY_FLAG = "__additional_property";
 
@@ -78,8 +80,8 @@ export function canExpand(schema, uiSchema, formData) {
 
 export function getDefaultRegistry() {
  return {
- fields: require("./components/fields").default,
- widgets: require("./components/widgets").default,
+ fields,
+ widgets,
  definitions: {},
  rootSchema: {},
  formContext: {},