the selected tabs,
The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
，这一点在体育直播中也有详细论述
2026-02-26 00:00:00:0本报记者 王伟健 一座江南小城何以集聚560多家德企——
call to .next() leaves the stream at a yield point, not an await point,