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Three native producers passed `undefined` where the cause belongs, so each error had an own `cause: undefined`: - `Bun::ERR::INVALID_ARG_VALUE_RangeError` (process.cpuUsage and ReadableStreamBYOBRequest errors), - `JSC__JSGlobalObject__createAggregateError` (several parse errors in one module), - `JSC__JSGlobalObject__createAggregateErrorWithArray` (a failed Bun.build). The first two now pass an empty value. The third loses its `cause` parameter: its one caller passed `undefined` for it, under the name `options`. node has no own `cause` on these errors. `util.inspect` printed `[cause]: undefined` for them.
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Status Reproduced on bun 1.4.3-canary.1+367d939d9 (linux x64): try {
process.cpuUsage({ user: -1, system: 0 });
} catch (err) {
console.log(Object.hasOwn(err, "cause"), require("util").inspect(err).includes("[cause]: undefined"));
}
// bun: true true
// node v26.3.0: false falseThe same holds for the The new test in |
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WalkthroughAggregateError construction no longer passes an undefined cause. A RangeError call site now passes an empty value instead of ChangesError cause handling
Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🔵 Low · up to The change adds a test-only style violation with no established product impact. Its correction is small and localized, so the remaining merge risk is low. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @test/js/bun/util/inspect-error.test.js:
- Line 191: Replace the inline `require("util").inspect` call in the test with a
module-scope import of `inspect`, then call `inspect(errors[0])` directly while
preserving the existing assertion.
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline note, I also checked the dropped FFI parameter and the empty-JSValue sentinel: JSC__JSGlobalObject__createAggregateErrorWithArray has exactly one caller (src/jsc/JSGlobalObject.rs:942) and no declaration in src/jsc/bindings/headers.h, so the C++ and Rust signatures are the only two sides and now match; and src/jsc/bindings/ErrorCode.cpp:258 already passes JSValue() as "no cause" to ErrorInstance::create, so the three edited sites now follow the existing convention. The remaining jsUndefined() calls at ErrorCode.cpp:235/251 pass it as options, not cause, and cause stays empty there, so those are not sibling sites left behind.
Extended reasoning...
The change replaces jsUndefined() with an empty JSValue() at three native error-construction sites (ErrorCode.cpp, bindings.cpp) and drops the unused trailing cause parameter from one C++/Rust FFI pair, plus one regression test. It touches no security-sensitive surface. A verified finding is being withheld from posting and one nit is posted inline, so approval is not appropriate; the ruled-out items above are offered as context for a human reviewer.
The `util.inspect` assertion used an inline `require`. A module-scope import adds a line above the inline snapshots of this file, and they hold the line numbers of the file.
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LGTM — the second commit removed the inline require("util") from the new test, and the native change is a small, mechanical fix.
What was reviewed:
- The three producers now pass an empty
JSValue()as the cause, which is the pattern already used in-tree (napi.cpp:1061, JSEventTarget.cpp:230, ErrorCode.cpp:258); JSC'sErrorInstanceonly definescausefor a non-empty value. - Grepped for other
jsUndefined()-as-cause sites: the remaining ones in ErrorCode.cpp:235/251 passundefinedas theoptionsobject, whosecauseis read viagetIfPropertyExistsand so is already empty when absent. JSC__JSGlobalObject__createAggregateErrorWithArrayhas exactly one caller (JSGlobalObject.rs:942) and no declaration in headers.h, so the Rust extern is the only signature that needed updating.- The new test asserts own-
causeabsence for all three fixed producers via a singletoEqual, and the gate output shows it failing on main withtruefor the RangeError.
Extended reasoning...
The change touches two C++ binding files (bindings.cpp, ErrorCode.cpp), one Rust FFI declaration and call site (JSGlobalObject.rs), and adds one test to the existing inspect-error.test.js; it replaces jsUndefined() with an empty JSValue() as the cause argument in three native error constructors and drops an unused parameter. It touches no security-sensitive surface. The edit is five lines of production code following an existing in-tree pattern, the removed parameter had a single caller and no stale C header declaration, the sibling createError paths already derive an empty cause when the options object lacks one, and the nit from the prior review (inline require in the test) was addressed in the second commit. The only other reviewer activity was a COMMENTED review on the same test line that was since rewritten, with no CHANGES_REQUESTED outstanding.
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Related to #44264
Problem
cause: undefined:Object.hasOwn(err, "cause")istrueandutil.inspect(err)prints[cause]: undefined. node has no owncausethere.undefinedas the cause:Bun::ERR::INVALID_ARG_VALUE_RangeError(src/jsc/bindings/ErrorCode.cpp:1092),JSC__JSGlobalObject__createAggregateError(src/jsc/bindings/bindings.cpp:3731) and the caller ofJSC__JSGlobalObject__createAggregateErrorWithArray(src/jsc/JSGlobalObject.rs:946).Fix
causeparameter: its one caller passedundefinedfor it, under the nameoptions.test/js/bun/util/inspect-error.test.js(1 new test, it fails on main). Alsoprocess.test.js,bundler_files.test.ts,bun-build-api.test.tsandtest/js/node/errors/.causefrom the constructor option when it is not an Error #44264 that held these edits. 1 applies here and is addressed (thecauseparameter is gone). 30 concern the printer change, which is not in this PR.Background
JSC::ErrorInstance::createdefinescausefor every value that is not empty,undefinedincluded, asnew Error(message, { cause: undefined })does. An emptyJSValuemeans no cause.Downsides
"cause" in errandObject.hasOwn(err, "cause")are nowfalsefor theRangeErrorofprocess.cpuUsage(prevValue)and ofReadableStreamBYOBRequest.respondWithNewView(), and for theAggregateErrorof a failedBun.buildor of a module with several parse errors.err.causeis stillundefined.Promise.anyrejection and theTypeErrorof a promise resolved with itself get an owncause: undefinedinside JSC (Promise.any: give the AggregateError a stack, message, and no spurious cause WebKit#340, Promise.any: give the rejected AggregateError a stack, message, and no spurious cause #35532).Notes
Before and after. Release build of main (367d939), debug build of this branch, node v26.3.0:
causeon mainprocess.cpuUsage({ user: -1, system: 0 })undefinedbyobRequest.respondWithNewView()with a view of the wrong bufferundefinednew Bun.Transpiler().transformSync(source), 4 parse errorsundefinedBun.build()that failsundefinedimport()of a module with 4 parse errorsundefinedutil.inspectof the first error prints a[cause]: undefinedline on main and no such line with this PR.Cost. No new code. Two call sites pass an empty value where they passed
undefined, and one parameter is removed. Each of these errors has one property less.Why now. #44264 asks the error printer to print a
causefrom the constructor that is not an Error. With these producers unchanged, that printer adds acause: undefined,line to these errors. The printer change itself is on the branchrobobun/5ce7396e/print-non-error-cause. It edits the loop and thecausefallback ofprint_error_instance_bodythat #44268 rewrites, so it waits for #44268. These edits do not depend on it.Other open pull requests. A three-way merge (
git merge-file --diff3) of the four files with #44268, #37270, #44174, #36602 and #40227 gives 0 conflict blocks. #38074 edits the samecreateAggregateErrorcall: it has 5 conflict blocks inbindings.cppwith main today and 6 with this branch.Not changed.
node:worker_threadsgives the'error'listenernew Error(message, { cause: event })when the thrown value cannot be cloned (src/js/node/worker_threads.ts:1219). Thatcauseis set on purpose and is notundefined.Suites run (debug build):
test/js/bun/util/inspect-error.test.js(40 pass),test/js/node/process/process.test.js -t cpuUsage(5 pass),test/bundler/bundler_files.test.ts(28 pass),test/js/web/streams/streams.test.js -t byob(1 pass),test/js/node/errors/(11 pass),test/bundler/bun-build-api.test.ts(68 pass, 2 bytecode tests time out at 5 s on the debug build, with and without this change).[auto-merge] gate passed · iteration 0 · 4 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 1 passed · 0 rejected · iteration 0
evidence per changed file