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util: display a present-but-undefined error cause #41247

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merged 1 commit into from Dec 21, 2021
+21 −1
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util: display a present-but-undefined error cause #41247

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2 changes: 1 addition & 1 deletion lib/internal/util/inspect.js
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Expand Up @@ -1282,7 +1282,7 @@ function formatError(err, constructor, tag, ctx, keys) {

removeDuplicateErrorKeys(ctx, keys, err, stack);

if (err.cause !== undefined &&
if ('cause' in err &&
(keys.length === 0 || !keys.includes('cause'))) {
keys.push('cause');
}
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4 changes: 4 additions & 0 deletions test/message/util-inspect-error-cause.js
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Expand Up @@ -22,9 +22,13 @@ const cause5 = new Error('Object cause', {
' at Module._compile (node:internal/modules/cjs/loader:827:30)'
}
});
const cause6 = new Error('undefined cause', {
cause: undefined
});

console.log(cause4);
console.log(cause5);
console.log(cause6);

process.nextTick(() => {
const error = new RangeError('New Stack Frames', { cause: cause2 });
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10 changes: 10 additions & 0 deletions test/message/util-inspect-error-cause.out
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Expand Up @@ -23,6 +23,16 @@ Error: Object cause
' at Module._compile (node:internal/modules/cjs/loader:827:30)'
}
}
Error: undefined cause
at *
at *
at *
at *
at *
at *
at * {
[cause]: undefined
}
RangeError: New Stack Frames
at *
*[90m at *[39m {
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6 changes: 6 additions & 0 deletions test/parallel/test-util-inspect.js
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Expand Up @@ -665,9 +665,15 @@ assert.strictEqual(util.inspect(-5e-324), '-5e-324');
delete falsyCause1.stack;
const falsyCause2 = new Error(undefined, { cause: null });
falsyCause2.stack = '';
const undefinedCause = new Error('', { cause: undefined });
undefinedCause.stack = '';

assert.strictEqual(util.inspect(falsyCause1), '[Error] { [cause]: false }');
assert.strictEqual(util.inspect(falsyCause2), '[Error] { [cause]: null }');
assert.strictEqual(
util.inspect(undefinedCause),
'[Error] { [cause]: undefined }'
);
}

{
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