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v1.6.2 throws on getConnection when using createPoolCluster

See original GitHub issue

When creating a cluster using mysql.createPoolCluster() the call to cluster.getConnection() throws in 1.6.2. This worked fine in previous versions of mysql2.

Run the following code to reproduce the bug:

const mysql = require('mysql2')

const cluster = mysql.createPoolCluster()

cluster.add({ host: 'localhost', user: 'root', database: 'test' })

// This call throws
cluster.getConnection(function (err, conn) {
  if (err) throw err
  console.log('success!')
})

This code will throw the following error:

/tmp/node_modules/mysql2/lib/pool_cluster.js:36
    this._selector = new Selector[selector]();
                     ^

TypeError: Selector[selector] is not a constructor
    at new PoolNamespace (/tmp/node_modules/mysql2/lib/pool_cluster.js:36:22)
    at PoolCluster.of (/tmp/node_modules/mysql2/lib/pool_cluster.js:96:31)
    at PoolCluster.getConnection (/tmp/node_modules/mysql2/lib/pool_cluster.js:121:24)
    at Object.<anonymous> (/tmp/test.js:8:9)
    at Module._compile (internal/modules/cjs/loader.js:707:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:718:10)
    at Module.load (internal/modules/cjs/loader.js:605:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:544:12)
    at Function.Module._load (internal/modules/cjs/loader.js:536:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:760:12)