nl_tokens: Sets an environment value as being checked for
pl_tokens: function ( key , value ) { if ( typeof key == "object" ) { var map = key ; for ( key in map ) { this . __environmentChecks [ key ] = map [ key ] ; } } else if ( <mask> === undefined ) { delete this . __environmentChecks [ key ] ; } else { this . __environmentChecks [ key ] = value ; } }