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doc: stream.isReadable and stream.isWritable API fixups #59089

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Merged
merged 6 commits into from
Sep 7, 2025
Merged

doc: stream.isReadable and stream.isWritable API fixups #59089

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c2bcc6f
lib: fix isReadable and isWritable return type value
joaoGabriel55 Jul 16, 2025
53c228b
test: write test-streem-utils.js test file
joaoGabriel55 Jul 16, 2025
4e040c1
rollback: undo the last change and delete the unnecessary test
joaoGabriel55 Jul 17, 2025
301d58c
doc: update isReadable and add isWritable doc
joaoGabriel55 Jul 17, 2025
844b176
lint: run make lint-js
joaoGabriel55 Jul 17, 2025
5e4640d
doc: clarify return values for isReadable and isWritable functions
joaoGabriel55 Jul 18, 2025
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16 changes: 10 additions & 6 deletions lib/internal/streams/utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -172,20 +172,24 @@ function isReadableFinished(stream, strict) {

function isReadable(stream) {
if (stream && stream[kIsReadable] != null) return stream[kIsReadable];
if (typeof stream?.readable !== 'boolean') return null;
if (typeof stream?.readable !== 'boolean') return false;
if (isDestroyed(stream)) return false;
return isReadableNodeStream(stream) &&
return Boolean(
isReadableNodeStream(stream) &&
stream.readable &&
!isReadableFinished(stream);
!isReadableFinished(stream)
);
}

function isWritable(stream) {
if (stream && stream[kIsWritable] != null) return stream[kIsWritable];
if (typeof stream?.writable !== 'boolean') return null;
if (typeof stream?.writable !== 'boolean') return false
if (isDestroyed(stream)) return false;
return isWritableNodeStream(stream) &&
return Boolean(
isWritableNodeStream(stream) &&
stream.writable &&
!isWritableEnded(stream);
!isWritableEnded(stream)
);
}

function isFinished(stream, opts) {
Expand Down
12 changes: 12 additions & 0 deletions test/parallel/test-stream-utils.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
'use strict';
const assert = require('assert');

const { isReadable, isWritable, Writable, Readable } = require('stream');

{

assert.strictEqual(isReadable(new Readable()), true);
assert.strictEqual(isReadable(new Writable()), false);
assert.strictEqual(isWritable(new Writable()), true);
assert.strictEqual(isWritable(new Readable()), false);
}