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…rors getter throws `formatError` read these properties with no guard. A value is formatted as an error when it inherits from Error.prototype, so each of them can be a getter that throws. The copy of a DOMException that AssertionError makes for its message is such a value: the `name` and `message` getters of DOMException.prototype throw for a receiver that is not a DOMException. So `assert.deepStrictEqual(AbortSignal.abort().reason, new Error())` threw a TypeError in place of an AssertionError and left `Error.stackTraceLimit` at 0. The error of a failed `require()` did the same. Guard each read, as Node's lib/internal/util/inspect.js does.
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Updated 1:05 AM PT - Oct 28th, 2026
❌ @robobun, your commit ed2c4a5 has 6 failures in
🧪 To try this PR locally: bunx bun-pr 45254That installs a local version of the PR into your bun-45254 --bun |
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Status: open. The fix and its tests are on the branch, merged with How I reproduced it (Bun 1.4.3 and main): const assert = require("node:assert");
Error.stackTraceLimit = 10;
try {
assert.deepStrictEqual(AbortSignal.abort().reason, new Error("y"));
} catch (e) {
console.log(e.constructor.name, e.code, Error.stackTraceLimit);
}
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No actionable comments were generated in the recent review. ℹ️ Recent review info
WalkthroughError inspection now handles failures when reading or converting error properties. Tests cover throwing getters, inherited error values, and assertion comparisons that preserve ChangesError formatting
Suggested reviewers: Priority: Merge Risk:
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Check skipped because no linked issues were found for this pull request. |
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Check skipped because no linked issues were found for this pull request. |
| Title check | |
The title names the main change: util.inspect no longer throws when reading an error's stack, name, message, or errors getter. It is specific and matches the objectives and the file changes, so it is … |
| Description check | |
The description follows the template with both required sections, "What does this PR do?" (Problem, Fix, Background, Downsides) and "How did you verify your code works?" (test files named, fail-on-mai… |
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Explanation
The title names the main change: util.inspect no longer throws when reading an error's stack, name, message, or errors getter. It is specific and matches the objectives and the file changes, so it is a pass.
Full details: Description check
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Explanation
The description follows the template with both required sections, "What does this PR do?" (Problem, Fix, Background, Downsides) and "How did you verify your code works?" (test files named, fail-on-main counts, and measurements). It explains the cause, the fix, and the trade-offs, and it gives a reproduction example. The required headings are present and substantively filled. Minor gaps: the description does not restate the scope of the four test files in the verification section, and the 'Downsides' figure (580 bytes) differs from the objectives text (351 bytes). The check passes because the description is mostly complete.
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/js/internal/util/inspect.js:
- Line 1788: Update the check in the error-property inspection path to verify
value is a string before calling StringPrototypeIncludes; skip non-string values
so util.inspect does not trigger coercion errors.
- Around line 1864-1867: Normalize the raw message read from err.message before
using it in the stack handling: convert it to a string with appropriate error
handling, or accept only strings. Use the normalized value consistently for the
truthiness check in the stack.replace expression and the later
StringPrototypeIndexOf and length operations, avoiding raw non-string message
values.
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📒 Files selected for processing: 4
src/js/internal/util/inspect.jstest/js/node/assert/assert.spec.tstest/js/node/inherited-errors.tstest/js/node/util/node-inspect-tests/internal-inspect.test.js
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Additional findings (outside the current diff — GitHub can't attach inline comments there):
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🟣
src/js/internal/util/inspect.js— pre-existing: util.inspect still throws when an error's cause has a stack that cannot be read and a name getter that throws, e.g. cause{ __proto__: DOMException.prototype }. The guardedgetStackStringhelper has a second caller at src/js/internal/util/inspect.js:1724 that is not wrapped: theErrorPrototypeToStringfallback readscause.nameand the throw escapesgetStackFramesandformatError. Fix: make every caller ofgetStackStringnon-throwing for a throwing stack/name/message, for example catch ingetStackFramesand skip the cause-frame dedupe, or move theObjectPrototypeToStringfallback into the helper so both sites get it. [also at: src/js/internal/util/inspect.js:1709 - pre-existing: callers of util.inspect still get a thrown getter error, instead of output, when an error'scausehas stack and name getters that both throw. getStackString at src/js/internal/util/inspect.js:1709 falls back to ErrorPrototypeToString, which reads name and message with no guard; the direct formatError path catches that at inspect.js:1851, but the sibling caller getStackFrames at inspect.js:1724 does not.]Why this was flagged
Trigger:
util.inspect(new Error("a", { cause: { __proto__: DOMException.prototype } })). formatError(err) at src/js/internal/util/inspect.js:1896 calls getStackFrames, which at src/js/internal/util/inspect.js:1724 calls getStackString(cause) with no try. In getStackString (src/js/internal/util/inspect.js:1709)stackis falsy or its getter threw, so it calls ErrorPrototypeToString(cause), which readscause.name; the DOMException.prototype name getter throws for a non-DOMException receiver. Nothing catches it: the try at src/js/internal/util/inspect.js:1849 covers only the outer error's own stack read. The caller gets a TypeError from util.inspect instead of a string, the same as on the base branch, so this is pre-existing; the PR guards one of the two callers of the helper it changed and leaves the sibling.Verification: pre-existing — base already throws by the same route. getStackFrames at src/js/internal/util/inspect.js:1724 calls
getStackString(cause)with no try/catch around the call. getStackString line 1709return stack ? String(stack) : ErrorPrototypeToString(error);readsname/messageand its throw propagates. Nothing upstream catches it, so the TypeError escapesutil.inspect.
… be strings
- `getStackFrames` read the stack of the `cause` with no guard, so
`util.inspect(new Error("a", { cause: { __proto__: DOMException.prototype } }))`
threw. `getStackString` now returns undefined when an error has no text,
and both of its callers handle that.
- A `name`, a `message` or an own `stack` that cannot be a string (a
`toString` that throws, a Symbol) threw from `String()`, `indexOf` or
`includes`. `formatError` and `removeDuplicateErrorKeys` catch that.
- When the message getter throws, `formatError` no longer rewrites the first
line of a stack that already has the message in it.
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Commit 02e91ab addresses both points from my earlier review: the ^Error: rewrite is now skipped when the message getter throws, and removeDuplicateErrorKeys wraps the StringPrototypeIncludes coercion in the same try. Beyond the two inline nits, I also checked that ordinary native errors take the same path as before (message is a string, so the pos computation and the prefix rewrite are unchanged) and that the getStackFrames cause guard handles the undefined stack before StringPrototypeSlice.
Extended reasoning...
The change hardens formatError, getStackString, getStackFrames and removeDuplicateErrorKeys in src/js/internal/util/inspect.js against throwing getters and unstringifiable values, mirroring Node's guards, plus a shared test fixture and new test.each matrices in the assert and inspect suites. It touches no security-sensitive surface. The second push resolves both prior inline threads, and the remaining inline findings are nits, so this note only records what else was examined.
…first line formatError put the name into the first line of the stack with String.prototype.replace. That call expands `$&`, `$$`, "$`" and `$'` in the name. It now cuts the `Error: ` prefix and joins the strings. The tests for a name, a message or a stack that cannot be a string now compare the whole text.
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Pushed 7d23d49 and 6e1ed12 for the open review notes.
The PR body has the new numbers. Two cases still throw, and both are outside
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A note on landing order. #46111 deletes the The two diffs do not touch the same lines, so git reports no conflict in either order. The merged file then calls
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Main renamed src/js/internal/util/inspect.js to inspect.ts, typed it, and replaced the uncurried primordials with `.$call` on the prototype method. The guards of this branch move to the renamed file in that form: `getStackString` returns `string | undefined`, and the new lines call `ObjectPrototypeToString`, `StringPrototypeStartsWith` and `StringPrototypeSlice` through `.$call`.
…-error Main typed the files of this branch and renamed inspect.js and node-shims.js to .ts. The changes of this branch move to those files: - inspect.ts is the file of #45254 after its merge with main. - events.ts keeps the `shared` binding of main and takes `isError` from it. - iter/utils.ts and repl/node-shims.ts use the shared `isError` in place of the typed private copies of main. - event-emitter.test.ts has the imports of both sides.
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Checked the merge with
Build 134193 of that commit did not start: no agent could be created ( |
Problem
assert.deepStrictEqual(AbortSignal.abort().reason, new Error())throwsTypeError: The DOMException.name getter can only be used on instances of DOMException, not anAssertionError. It also leavesError.stackTraceLimitat 0.AssertionErrorsets the limit to 0, builds its message withutil.inspect, then restores the limit.formatError(src/js/internal/util/inspect.ts:1945) readsstack,name,messageanderrorswith no guard.Fix
getStackString,formatError,removeDuplicateErrorKeysandgetStackFramesread each property once, in atry. Aname,messageorstackthat cannot be a string does not throw.Object.prototype.toString.call(err), as in Node.String.prototype.replace, so$&in a name stays as it is.test/js/node/util/node-inspect-tests/internal-inspect.test.js(15 tests fail on main),test/js/node/assert/assert.spec.ts(2 of 10 rows fail on main), and the otherutil.inspectandnode:assertsuites.Background
util.inspectformats a value as an error when it inherits fromError.prototype. So the four properties can be getters that throw.AssertionErrorshows two errors as copies (copyError): plain objects with the prototype of the original. Thenameandmessagegetters ofDOMException.prototypethrow for such a copy.formatError.Downsides
nameormessagestill throws: the engine throws whenutil.inspectlists the own keys.Notes
Merged with
mainat 11c3671. #45631 renamedinspect.jstoinspect.ts, typed it, and calls the primordials through.$callon the prototype method. The guards of this PR are in the renamed file in that form, andgetStackStringis typedstring | undefined. The numbers below are from that merge. The diffstat in the gate block is from the earlierinspect.js.Why it is alone. This part was split out of #45255 on self-review. It needs no decision, and #45255 asks a question. #45255 has the same commits.
How to reproduce. The error of a failed
require()(aResolveMessage) as an operand does the same.Measurements. Main
11c367163aagainst this PR on one debug binary. Node is v26.3.0.AssertionErroror leaveError.stackTraceLimitat 0, over 96 cells (8 kinds of error, as an operand or as a cause, 6 assert calls): main 24, this PR 0, Node 0. This count is from the first base,47ba1c8d85.formatError289 to 322,getStackString13 to 21,removeDuplicateErrorKeys60 to 63,getStackFrames86 to 89.get_by_id):formatError16 to 11,getStackString2 to 1. Regular expression literals informatError: 1 to 0.String.prototype.replacecall with a regular expression. It is onestartsWithcall, and oneslicecall for a stack that starts withError:.bundle-modules.ts --debug=OFF): 1 file changed, +580 bytes.What
util.inspectprints now, as Node v26.3.0.stackgetter that throws:[Error: m]stackandnamegetters that throw:[object Error]{ __proto__: DOMException.prototype }:[object DOMException]namegetter that throws, on an object with astack: the stack, then{ name: [Getter] }What it prints where Node v26.3.0 throws or prints other text.
DOMException.prototype, or a cause withstackandnamegetters that throw: the error, then[cause]: [object DOMException]or[cause]: [object Error]. Node throws fromgetStackFrames.nameormessagegetter that throws, or anameormessagewhosetoStringthrows: the stack. Node prints[object Error]. V8 formats the stack when it is first read, so the read itself throws there.stackthat is a Symbol:[Symbol(s)] { stack: Symbol(s) }. Node prints the Symbol as a value belowError: m.e.name = "A$&B"): the first line isA$&B: m. Main printsAError: B: m.Not changed.
Proxywith a trap that throws, still leavesError.stackTraceLimitat 0. Node does the same.Object.getOwnPropertyNames(e),Object.getOwnPropertySymbols(e),Reflect.ownKeys(e)and"stack" in ethrowTypeError: Cannot convert a symbol to a stringfor an error whose ownnameormessageis a Symbol. Node returns the keys and prints[object Error]. This is in the engine, not inutil.inspect.util.inspectthrows for any object with aSymbol.toStringTaggetter that throws:formatRawreads it with no guard (inspect.ts:1359). Node guards that read.[human-review] 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