stream-utils.mjs•1.2 kB
/**
* Most browsers don't yet have async iterable support for ReadableStream,
* and Node has a very different way of reading bytes from its "ReadableStream".
*
* This polyfill was pulled from https://github.com/MattiasBuelens/web-streams-polyfill/pull/122#issuecomment-1627354490
*/
export function ReadableStreamToAsyncIterable(stream) {
if (stream[Symbol.asyncIterator])
return stream;
const reader = stream.getReader();
return {
async next() {
try {
const result = await reader.read();
if (result?.done)
reader.releaseLock(); // release lock when stream becomes closed
return result;
}
catch (e) {
reader.releaseLock(); // release lock when stream becomes errored
throw e;
}
},
async return() {
const cancelPromise = reader.cancel();
reader.releaseLock();
await cancelPromise;
return { done: true, value: undefined };
},
[Symbol.asyncIterator]() {
return this;
},
};
}
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