test(dtslint): add buffer (#4193)
test(dtslint): add buffer (#4193)

* test(dtslint): add buffer

* test(dtslint): add extra spec

benlesh/RxJS,kwonoj/RxJS,Brocco/RxJS,ReactiveX/RxJS,trxcllnt/RxJS,Brocco/RxJS,ReactiveX/rxjs,trxcllnt/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,ReactiveX/rxjs,trxcllnt/RxJS,kwonoj/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,kwonoj/RxJS,benlesh/RxJS,benlesh/RxJS,Brocco/RxJS,ReactiveX/RxJS,Brocco/RxJS,martinsik/rxjs,benlesh/RxJS,martinsik/rxjs,trxcllnt/RxJS,martinsik/rxjs,kwonoj/RxJS,martinsik/rxjs