Baseline Widely available
Note: This feature is available in Web Workers.
The ready read-only property of the WritableStreamDefaultWriter interface returns a Promise that resolves when the desired size of the stream's internal queue transitions from non-positive to positive, signaling that it is no longer applying backpressure.
A Promise.
The following example shows two uses of the ready property. The first uses ready to ensure that the WritableStream is done writing and thus able to receive data before sending a binary chunk. The second also checks whether the WritableStream is done writing, but this time because the writing must be finished before the writer can be closed.
function sendMessage(message, writableStream) {
// defaultWriter is of type WritableStreamDefaultWriter
const defaultWriter = writableStream.getWriter();
const encoder = new TextEncoder();
const encoded = encoder.encode(message);
encoded.forEach((chunk) => {
// Make sure the stream and its writer are able to
// receive data.
defaultWriter.ready
.then(() => defaultWriter.write(chunk))
.then(() => {
console.log("Chunk written to sink.");
})
.catch((err) => {
console.error(`Chunk error: ${err}`);
});
// Call ready again to ensure that all chunks are written
// before closing the writer.
defaultWriter.ready
.then(() => defaultWriter.close())
.then(() => {
console.log("All chunks written");
})
.catch((err) => {
console.error(`Stream error: ${err}`);
});
});
}
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