FrontEndVirtual

WLJS

Execution environment

It is a virtual containers-executable wrapper for any expressions evaluated on WLJS

FrontEndVirtual[expr_]

This is alternative way of making Containers | Virtualization for any expression

Another option

You do not need FrontEndVirtual if you add one line to your Javascript code

change

...

core.YouSymbol.virtual = true

this will tell WLJS Interpreter to automatically create an instance