vm: support shared microtask queues - #65582
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Add `vm.MicrotaskQueue` and `options.microtaskQueue` to allow multiple contexts to share an explicit V8 microtask queue and let users control synchronous checkpoint draining. Fixes: nodejs#65555 Signed-off-by: Alessio Attilio <alessio.attilio@protonmail.com> Assisted-by: Antigravity
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Document how options.microtaskQueue and options.microtaskMode interact across createContext, runInNewContext, and script.runInNewContext. Update receiver type error expectation for runMicrotasks and add test coverage for runInNewContext with microtask queues. Signed-off-by: Alessio Attilio <alessio.attilio@protonmail.com> Assisted-by: Antigravity
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This PR is failing linting tests. See the comments in the tests for more detail. See also Pull requests > Step 6: Test with further details in the linked document section BUILDING > Running tests.
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #65582 +/- ##
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- Coverage 90.07% 90.06% -0.01%
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Files 751 751
Lines 254875 255019 +144
Branches 48115 48140 +25
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+ Hits 229586 229694 +108
- Misses 16467 16505 +38
+ Partials 8822 8820 -2
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This PR introduces vm.MicrotaskQueue and the options.microtaskQueue setting in node:vm, allowing multiple contexts to share an explicit V8 microtask queue and giving authors synchronous control over draining via queue.runMicrotasks(). This enables standards-compliant event loop integration such as HTML window and same-agent iframe microtask checkpointing without premature queue draining.
Fixes: #65555