Breaking Change: PoolConnection is no longer derived from Connection since 3.11.5.

[wakabayashik]

import mysql from 'mysql2';
const Connection = mysql.Connection;
const PoolConnection = mysql.PoolConnection;
console.log(PoolConnection.prototype instanceof Connection);

mysql2@3.11.4 : true
mysql2@3.11.5 : false

[wellwelwel]

Related:

• fix: circular dependencies #3081

[ashleybartlett]

I was doing some work to fix the Typescript types here, and this is now true, as it's not a true subclass of Connection by implementation, nor was it really ever.

That base class change likely needed to be released under a major version instead of the patch that it was. I don't see how they could fix this without reverting things, or doing other major breaking changes.