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fix(worker): route worker_threads errors like the web surface, and fire once listeners once - #491
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…errors like the web surface A parentPort listener that threw was dispatched without rethrowing, so the error went to the uncaught-error reporter and never reached the worker's onerror or its parent. The relay now dispatches the way worker-global message delivery does. The worker_threads Worker's onerror handler returned nothing, so an error its 'error' listeners took was also reported to the parent's global scope as unhandled. It returns whether a listener ran, which cancels the event.
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review. 📝 WalkthroughWalkthroughWorker error forwarding now carries thrown-value details to the parent and rebuilds errors for worker event listeners. Worker error listeners can cancel propagation to the parent global scope. Emitter behavior and parent-port exception relaying also changed. Tests and documentation cover these changes. The API download test now uses a configured host. ChangesWorker error and event handling
API test download
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant WorkerWrapper
participant WorkerEmitError
participant WorkerEvents
participant WorkerEmitter
participant ParentGlobalScope
WorkerWrapper->>WorkerEmitError: Forward error details
WorkerEmitError->>WorkerEvents: Call emitError with name and message
WorkerEvents->>WorkerEmitter: Emit event with rebuilt error
WorkerEmitter->>ParentGlobalScope: Dispatch if the event is not canceled
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The reviewed changes are limited to a test and a comment, so the merge-readiness risk is minimal. The worker error-routing changes elsewhere in the PR were not part of this incremental review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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… reentrant emit An earlier listener that emitted the same event again let the nested emit fire and remove a later once listener, and the outer emit then called it a second time from its snapshot. A once registration now records that it fired, as Node's once wrapper does.
adrian-niculescu
changed the title
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Thanks, the once-wrapper and relay changes look right. I checked the once semantics against Node 24.18 and Two things before merging:
Not for this PR, just recording the remaining gap: Node terminates the worker after an uncaught throw and emits |
…rom the thrown value A worker_threads 'error' listener received the runtime's ErrorEvent, not an Error, and the message it carried was V8's "Uncaught Error: ..." text. The worker now reads the thrown value's name and message and forwards them with the error payload. The parent rebuilds an Error from them with the worker's stack, using the built-in constructor the name belongs to, and the parent's global error event carries that same Error when nothing handled it. The Worker shim cancels an error its listeners took with preventDefault() rather than through the truthy-return contract of onerror.
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Both done, here and in NativeScript/android#2065.
On the exit code: agreed. I also corrected the |
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Review comments at @NativeScript/runtime/WorkerWrapper.mm:
- Around line 649-657: Update DescribeThrownValue to enter the supplied context
before converting the thrown value or accessing its name and message, so these
operations run with the worker context active for every caller.
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NativeScript/runtime/DataWrapper.hNativeScript/runtime/NativeScriptException.mmNativeScript/runtime/NsBuiltinModules.cppNativeScript/runtime/Worker.hNativeScript/runtime/Worker.mmNativeScript/runtime/WorkerWrapper.mmNativeScript/runtime/js/node-worker-threads.jsNativeScript/runtime/js/primordials.jsNativeScript/runtime/js/worker-events.jsTestRunner/app/tests/MessagingTests.jsTestRunner/app/tests/messaging/domExceptionThrowingWorker.jsTestRunner/app/tests/messaging/parentPortThrowingWorker.jsdocs/ns-builtin-modules.mddocs/worker-threads.mdeslint.config.mjs
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…r throws Reading the stack of the error being reported could run a `stack` getter, and a getter that threw replaced that error in the TryCatch holding it, so the parent rebuilt the getter's error instead. The stack reads now run under their own TryCatch. The thrown value's name and message travel to the parent as UTF-16, so an unpaired surrogate arrives as thrown rather than as U+FFFD.
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@adrian-niculescu could you rebase on top of latest main? I merged a few changed on the workers (so we could have our own Also, please revert that testing change on the network side, if needed we'll address that on another PR |
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parentPort.on("message")listener that throws never reaches the worker'sonerroror the parent'sworker.on("error"). The relay dispatched without rethrowing, so the throw went to the uncaught-error reporter and stopped there. It now dispatches the way worker-global message delivery does.A
worker.on("error")listener received the runtime'sErrorEventinstead of anError, and an error it handled was also reported to the parent's global scope as unhandled. The worker now sends the thrown value'snameandmessagewith the error payload, and the parent rebuilds anErrorfrom them and the worker's stack, with the built-in constructor when the name is a built-in one. The listener receives thatError, as in Node. The emitter'semitreports whether a listener ran, as Node's does, and the Worker cancels the event when one did. An error nothing handled reaches the parent's globalerrorevent carrying the sameError.A
oncelistener could fire twice: when an earlier listener emitted the same event again, the nested emit fired and removed it, and the outer emit then called it a second time from its snapshot. A once registration now records that it fired, as Node's once wrapper does, so a once listener an earlier listener removed still fires, as in Node.The same worker fix for Android is NativeScript/android#2065.
The NSURLSession download completion spec uses the existing loopback HTTP fixture and checks the response and downloaded contents, so it does not depend on a Wikimedia download completing within Jasmine's five-second timeout.
Validation: the full TestRunner suite passed on an iPhone 17 simulator with Xcode 26.6: 1,746 tests, zero failures or errors, 11 skipped. The download completed in 4 ms. Isolated callback probes also covered HTTP and read errors, wrong contents, cancellation before the callback, and cancellation before queued completion.
Concurrency
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AbortError.