fix(build): revert to 5.4.x build output for CJS & add configurable support for ESM (#2878)
fix(build): revert to 5.4.x build output for CJS & add configurable support for ESM (#2878)


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