nl_tokens: Get the wrapper class of a given prototype .
pl_tokens: function getWrapper ( proto ) { if ( proto == null || proto === Object . prototype ) { return Event } let wrapper = wrappers . get ( proto ) ; if ( wrapper == null ) { wrapper = defineWrapper ( getWrapper ( Object . getPrototypeOf ( proto ) ) , proto ) ; wrappers . set ( proto , <mask> ) ; } return wrapper }