ReadableStreamDefaultReader.closed
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2020年1月.
ReadableStreamDefaultReader 接口的只读属性 closed 返回一个 Promise，这个 promise 在流关闭时兑现，而在流抛出错误或者 reader 的锁被释放时拒绝。该属性使你能够编写在一个流结束时响应的代码。