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worker: serialize errors if stack getter throws #26145

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worker: serialize errors if stack getter throws #26145

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6 changes: 4 additions & 2 deletions lib/internal/error-serdes.js
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,10 @@ function TryGetAllProperties(object, target = object) {
Assign(all, TryGetAllProperties(GetPrototypeOf(object), target));
const keys = GetOwnPropertyNames(object);
ForEach(keys, (key) => {
const descriptor = GetOwnPropertyDescriptor(object, key);
let descriptor;
try {
descriptor = GetOwnPropertyDescriptor(object, key);
} catch { return; }
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I am fine with returning undefined but wouldn't it be even better to return the error to the user as well? We could wrap it into something else so it's clear that accessing the property threw (for example by adding a new Node.js error like ERR_THREW_ON_ACCESS) which contains the actual error as property.

const getter = descriptor.get;
if (getter && key !== '__proto__') {
try {
Expand Down Expand Up @@ -89,7 +92,6 @@ function serializeError(error) {
for (var i = 0; i < constructors.length; i++) {
const name = GetName(constructors[i]);
if (errorConstructorNames.has(name)) {
try { error.stack; } catch {}
const serialized = serialize({
constructor: name,
properties: TryGetAllProperties(error)
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22 changes: 22 additions & 0 deletions test/parallel/test-worker-error-stack-getter-throws.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
'use strict';
const common = require('../common');
const assert = require('assert');
const { Worker } = require('worker_threads');

const w = new Worker(
`const fn = (err) => {
if (err.message === 'fhqwhgads')
throw new Error('come on');
return 'This is my custom stack trace!';
};
Error.prepareStackTrace = fn;
throw new Error('fhqwhgads');
`,
{ eval: true }
);
w.on('message', common.mustNotCall());
w.on('error', common.mustCall((err) => {
assert.strictEqual(err.stack, undefined);
assert.strictEqual(err.message, 'fhqwhgads');
assert.strictEqual(err.name, 'Error');
}));
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I suggest to change this part to:

w.on('error', common.expectsError({
  stack: undefined,
  message: 'fhqwhgads',
  name: 'Error'
});