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stream: make from read one at a time #33201

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stream: make from read one at a time #33201

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2 changes: 2 additions & 0 deletions lib/internal/streams/from.js
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,8 @@ function from(Readable, iterable, opts) {

const readable = new Readable({
objectMode: true,
highWaterMark: 1,
// TODO(ronag): What options should be allowed?
...opts
});

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26 changes: 25 additions & 1 deletion test/parallel/test-readable-from.js
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Expand Up @@ -159,6 +159,29 @@ async function asTransformStream() {
}
}

async function endWithError() {
async function* generate() {
yield 1;
yield 2;
yield Promise.reject('Boum');
}

const stream = Readable.from(generate());

const expected = [1, 2];

try {
for await (const chunk of stream) {
strictEqual(chunk, expected.shift());
}
throw new Error();
} catch (err) {
strictEqual(expected.length, 0);
strictEqual(err, 'Boum');
}
}


Promise.all([
toReadableBasicSupport(),
toReadableSyncIterator(),
Expand All @@ -168,5 +191,6 @@ Promise.all([
toReadableOnData(),
toReadableOnDataNonObject(),
destroysTheStreamWhenThrowing(),
asTransformStream()
asTransformStream(),
endWithError()
]).then(mustCall());