如何获取Mongoose中模型的_id (打字)

const MyModel = mongoose.model('MyModel', mySchema);
const doc = new MyModel({ name: 'John' });
console.log(doc._id); // 输出文档的_id值

MyModel.findOne({ name: 'John' }, (err, doc) => {
  if (err) {
    console.error(err);
  } else {
    console.log(doc._id); // 输出文档的_id值
  }
});

const mySchema = new mongoose.Schema({
  name: String
}, {
  toJSON: { virtuals: true },
  toObject: { virtuals: true }
});

mySchema.virtual('id').get(function() {
  return this._id.toHexString();
});

const MyModel = mongoose.model('MyModel', mySchema);

MyModel.findOne({ name: 'John' }, (err, doc) => {
  if (err) {
    console.error(err);
  } else {
    console.log(doc.id); // 输出文档的_id值
  }
});