let foo = { bar1 : { buzz ( ) { console . log ( "bar1" ) ; } } , bar2 : void 0 , } ; let x = foo ?. bar1 ?. buzz ( ) ; let y = foo ?. bar2 ?. buzz ( ) ; let z3 = foo ?. bar ?. buzz ?. ( ) ; let z4 = [ ] ?. [ 1 ] ; export { } ;