stream: handle sync writev completion in pipeTo - #63561

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stream: handle sync writev completion in pipeTo#63561
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Fixes: #63560

Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.

pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),
which caused a TypeError for synchronous completion.

Assisted-by: openai:gpt-5.5

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Review requested:

  • @nodejs/streams

@nodejs-github-botnodejs-github-bot added needs-ci PRs that need a full CI run. stream Issues and PRs related to Node.js streams. labels May 25, 2026
@trivikr
stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
trivikrforce-pushed the stream-iter-sync-writev-undefined branch from 13ee76d to 825d2c9CompareMay 25, 2026 16:51
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.32%. Comparing base (49dcaa0) to head (825d2c9).
⚠️ Report is 72 commits behind head on main.

Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20
Files with missing linesCoverage Δ
lib/internal/streams/iter/pull.js88.21% <100.00%> (+0.09%)⬆️

... and 43 files with indirect coverage changes

🚀 New features to boost your workflow:
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

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trivikr deleted the stream-iter-sync-writev-undefined branch June 4, 2026 05:02
aduh95 pushed a commit that referenced this pull request Jun 18, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot mentioned this pull request Jun 22, 2026
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@aduh95aduh95 mentioned this pull request Jul 22, 2026
Closed
aduh95 pushed a commit to aduh95/node that referenced this pull request Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit that referenced this pull request Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot mentioned this pull request Aug 21, 2026
Merged
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Merged
stream: handle sync writev completion in pipeTo#63561
nodejs-github-bot merged 1 commit into
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trivikr:stream-iter-sync-writev-undefined
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May 25, 2026

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Fixes: #63560
Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.
pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),

which caused a TypeError for synchronous completion.
Assisted-by: openai:gpt-5.5
@nodejs-github-bot
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Review requested:
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@trivikr
stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
trivikrforce-pushed
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stream-iter-sync-writev-undefined
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Codecov Report
✅ All modified and coverable lines are covered by tests.

✅ Project coverage is 90.32%. Comparing base (49dcaa0) to head (825d2c9).
⚠️ Report is 72 commits behind head on main.
Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20 
Files with missing linesCoverage Δ
lib/internal/streams/iter/pull.js88.21% <100.00%> (+0.09%)⬆️
... and 43 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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deleted the

stream-iter-sync-writev-undefined

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June 4, 2026 05:02
aduh95 pushed a commit
that referenced
this pull request
Jun 18, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Jun 22, 2026
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@aduh95aduh95
mentioned this pull request
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 Closed

aduh95 pushed a commit
to aduh95/node
that referenced
this pull request
Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit
that referenced
this pull request
Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Aug 21, 2026
 Merged

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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stream: handle sync writev completion in pipeTo#63561
nodejs-github-bot merged 1 commit into
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Fixes: #63560
Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.
pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),

which caused a TypeError for synchronous completion.
Assisted-by: openai:gpt-5.5
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Review requested:
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@trivikr
stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
trivikrforce-pushed
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Codecov Report
✅ All modified and coverable lines are covered by tests.

✅ Project coverage is 90.32%. Comparing base (49dcaa0) to head (825d2c9).
⚠️ Report is 72 commits behind head on main.
Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20 
Files with missing linesCoverage Δ
lib/internal/streams/iter/pull.js88.21% <100.00%> (+0.09%)⬆️
... and 43 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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aduh95 pushed a commit
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Jun 18, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
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aduh95 pushed a commit
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that referenced
this pull request
Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit
that referenced
this pull request
Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Aug 21, 2026
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stream/iter: pipeTo() crashes when synchronous writev() returns undefined


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, 'i');
if (__m === '*' || __re.test(location.href)) {
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Fixes: #63560
Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.
pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),

which caused a TypeError for synchronous completion.
Assisted-by: openai:gpt-5.5
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stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
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Codecov Report
✅ All modified and coverable lines are covered by tests.

✅ Project coverage is 90.32%. Comparing base (49dcaa0) to head (825d2c9).
⚠️ Report is 72 commits behind head on main.
Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20 
Files with missing linesCoverage Δ
lib/internal/streams/iter/pull.js88.21% <100.00%> (+0.09%)⬆️
... and 43 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
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aduh95 pushed a commit
to aduh95/node
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this pull request
Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit
that referenced
this pull request
Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
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Aug 21, 2026
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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stream: handle sync writev completion in pipeTo - #63561
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trivikr:stream-iter-sync-writev-undefined
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Merged
stream: handle sync writev completion in pipeTo#63561
nodejs-github-bot merged 1 commit into
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trivikr:stream-iter-sync-writev-undefined
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Fixes: #63560
Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.
pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),

which caused a TypeError for synchronous completion.
Assisted-by: openai:gpt-5.5
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@trivikr
stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
trivikrforce-pushed
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stream-iter-sync-writev-undefined
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Codecov Report
✅ All modified and coverable lines are covered by tests.

✅ Project coverage is 90.32%. Comparing base (49dcaa0) to head (825d2c9).
⚠️ Report is 72 commits behind head on main.
Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20 
Files with missing linesCoverage Δ
lib/internal/streams/iter/pull.js88.21% <100.00%> (+0.09%)⬆️
... and 43 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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aduh95 pushed a commit
that referenced
this pull request
Jun 18, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Jun 22, 2026
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@aduh95aduh95
mentioned this pull request
Jul 22, 2026
 Closed

aduh95 pushed a commit
to aduh95/node
that referenced
this pull request
Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit
that referenced
this pull request
Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Aug 21, 2026
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stream/iter: pipeTo() crashes when synchronous writev() returns undefined


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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stream: handle sync writev completion in pipeTo - #63561
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Merged
stream: handle sync writev completion in pipeTo#63561
nodejs-github-bot merged 1 commit into
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Fixes: #63560
Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.
pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),

which caused a TypeError for synchronous completion.
Assisted-by: openai:gpt-5.5
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stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
trivikrforce-pushed
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stream-iter-sync-writev-undefined
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Codecov Report
✅ All modified and coverable lines are covered by tests.

✅ Project coverage is 90.32%. Comparing base (49dcaa0) to head (825d2c9).
⚠️ Report is 72 commits behind head on main.
Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20 
Files with missing linesCoverage Δ
lib/internal/streams/iter/pull.js88.21% <100.00%> (+0.09%)⬆️
... and 43 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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deleted the

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aduh95 pushed a commit
that referenced
this pull request
Jun 18, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Jun 22, 2026
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aduh95 pushed a commit
to aduh95/node
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this pull request
Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit
that referenced
this pull request
Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
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Aug 21, 2026
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stream/iter: pipeTo() crashes when synchronous writev() returns undefined


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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Merged
stream: handle sync writev completion in pipeTo#63561
nodejs-github-bot merged 1 commit into
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Fixes: #63560
Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.
pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),

which caused a TypeError for synchronous completion.
Assisted-by: openai:gpt-5.5
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stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
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⚠️ Report is 72 commits behind head on main.
Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20 
Files with missing linesCoverage Δ
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... and 43 files with indirect coverage changes
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@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
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Jun 22, 2026
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Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit
that referenced
this pull request
Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
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Aug 21, 2026
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Fixes: #63560
Fixes stream/iterpipeTo() when a duck-typed writer accepts a batched
writev() synchronously and returns undefined.
pipeTo() already tolerated undefined from single write() calls, but the
writev() path passed the return value directly to PromisePrototypeThen(),

which caused a TypeError for synchronous completion.
Assisted-by: openai:gpt-5.5
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  •  @nodejs/streams
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@trivikr
stream: handle sync writev completion in pipeTo
825d2c9
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
@trivikr
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stream-iter-sync-writev-undefined
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Codecov Report
✅ All modified and coverable lines are covered by tests.

✅ Project coverage is 90.32%. Comparing base (49dcaa0) to head (825d2c9).
⚠️ Report is 72 commits behind head on main.
Additional details and impacted files
@@ Coverage Diff @@## main #63561 +/- ##
==========================================
- Coverage 90.33% 90.32% -0.02% 
==========================================
Files 730 730 Lines 234362 234472 +110 Branches 43906 43916 +10 ==========================================
+ Hits 211713 211781 +68 - Misses 14371 14433 +62 + Partials 8278 8258 -20 
Files with missing linesCoverage Δ
lib/internal/streams/iter/pull.js88.21% <100.00%> (+0.09%)⬆️
... and 43 files with indirect coverage changes
 🚀 New features to boost your workflow: 
  • ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
  • 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.
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deleted the

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aduh95 pushed a commit
that referenced
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Jun 18, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
2cb84c2
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
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aduh95 pushed a commit
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Jul 30, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f5b449e
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: nodejs#63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: nodejs#63561Fixes: nodejs#63560
Reviewed-By: James M Snell <jasnell@gmail.com>
aduh95 pushed a commit
that referenced
this pull request
Aug 6, 2026
@trivikr@aduh95
stream: handle sync writev completion in pipeTo
f0ee316
Treat writer.writev() returning undefined as synchronous success to
match the existing write() fallback behavior for duck-typed writers.
This avoids calling Promise.prototype.then on undefined after a batch
write has already been accepted.
Fixes: #63560
Signed-off-by: Kamat, Trivikram <16024985+trivikr@users.noreply.github.com>
Assisted-by: openai:gpt-5.5
PR-URL: #63561
Backport-PR-URL: #64675Fixes: #63560
Reviewed-By: James M Snell <jasnell@gmail.com>
@github-actionsgithub-actionsBot
mentioned this pull request
Aug 21, 2026
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stream/iter: pipeTo() crashes when synchronous writev() returns undefined


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