Nodejs mongoose库中MongoError问题?

Question

描述

我想显式触发一个重复插入错误: E11000 duplicate key error collection: my_data.user index: uid_1 dup key: { : "111247326728" }
`(其实就是唯一索引重复插入问题)

const MongoError = require('mongodb-core').MongoError

async function insertUser(uid) {
    try {
        await userModel.create({
            "uid": uid,
            "create_datetime": new Date(),
        })
    } catch (e) {
        console.log(e instanceof MongoError)
        if (e.code === 11000) {
            console.log('重复插入错误')
        }
    }
}

然而我发现e instanceof MongoError结果是false
MongoError是我从报错的stackTrace里找出来的