如何让Formik返回一个布尔值？

import React from 'react';
import { Formik, Form, Field } from 'formik';

const MyForm = () => {
  return (
    <Formik
      initialValues={{ email: '', password: '' }}
      validate={(values) => {
        const errors = {};
        if (!values.email) {
          errors.email = 'Required';
        }
        if (!values.password) {
          errors.password = 'Required';
        }
        return errors;
      }}
      onSubmit={(values) => {
        console.log(values);
      }}
    >
      {({ isValid }) => (
        <Form>
          <div>
            <label htmlFor="email">Email</label>
            <Field type="email" id="email" name="email" />
          </div>
          <div>
            <label htmlFor="password">Password</label>
            <Field type="password" id="password" name="password" />
          </div>
          <button type="submit" disabled={!isValid}>
            Submit
          </button>
        </Form>
      )}
    </Formik>
  );
};

export default MyForm;