Note: This feature is available in Web Workers.
The locked read-only property of the WritableStream interface returns a boolean indicating whether the WritableStream is locked to a writer.
A boolean value indicating whether or not the writable stream is locked.
const writableStream = new WritableStream(
{
write(chunk) {
// …
},
close() {
// …
},
abort(err) {
// …
},
},
queuingStrategy,
);
// …
const writer = writableStream.getWriter();
writableStream.locked;
// should return true, as the stream has been locked to a writer