What are flexServerInternals and sandboxFlowContext variables

hi all I'm using opcua compact server node and in a tutorial there are the following command in the javascript code
function constructAlarmAddressSpace(server,addressSpace,eventObjects,done){
var flexServerInternals = this;

I would like learn more details about flexServerInternals and sandboxFlowContext in order to reach them outside node too
many thanks in advance
best regards

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