`type: date` not work

[xianjie-li]

const source = {
  date: 'qwertyu', // or  '  '  |  '12345'  |  anything
};

const rules = {
  date: {
    required: true,
    type: 'date',
  }
};

new Schema(rules).validate(source, err => {
  console.log(222, err);  // did not execute here, nothing happened.
});

link: https://codesandbox.io/s/aged-darkness-2u8wr?file=/src/index.js