由于同时在连接选项中添加【useUnifiedTopology: true】拓扑与引用【excel-export】模块引发事件内存泄漏

[hcdast]

mongoose版本：5.7.6
Do you want to request a feature or report a bug?
在连接选项中添加【useUnifiedTopology: true】后，在引用【excel-export】模块后，启动服务会报错

What is the current behavior?

If the current behavior is a bug, please provide the steps to reproduce.

What is the expected behavior?

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.

[hcdast]

可能这块提到的有关https://jira.mongodb.org/browse/NODE-2123

[vkarpov15]

excel-export doesn't depend on mongodb or mongoose, so this shouldn't have anything to do with excel-export in particular. It looks like the issue you mentioned, https://jira.mongodb.org/browse/NODE-2123, will be fixed in mongodb@3.3.4, so once that is released we will upgrade.

[vkarpov15]

Should be closed by #8337