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The closed getter property of the ReadableStream interface returns a promise that fulfills if the stream becomes closed or the reader's lock is released, or rejects if the stream errors.
var closed = readableStreamDefaultReaderInstance.closed;
A Promise.
In this snippet, a previously-created reader is queried to see if the stream has been closed. When it is closed, the promise fulfills and the message is logged to the console.
reader.closed.then(() => {
console.log('reader closed');
}) | Specification | Status | Comment |
|---|---|---|
| Streams The definition of 'closed' in that specification. | Living Standard | Initial definition. |
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https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader/closed