Copyinterface Operator<T, U> { (source: Source<T>): Source<U> }1interface Operator<T, U> {2 (source: Source<T>): Source<U>3}
interface Operator<T, U> { (source: Source<T>): Source<U> }1interface Operator<T, U> {2 (source: Source<T>): Source<U>3}