It creates a clone of the dop object. It could be useful when you need to emulate different enviroments on the same script.
Object
import dop from 'dop'
const dopServer = dop.factory()
const dopClient = dop.factory()
dop === dopClient // false
dopServer === dopClient // false
const nodeServer = dopServer.createNode()
const nodeClient = dopClient.createNode()