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assert: fix loose deepEqual arrays with undefined and null failing #61587

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Merged
nodejs-github-bot merged 1 commit into from
Feb 1, 2026
Merged

assert: fix loose deepEqual arrays with undefined and null failing #61587

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assert: fix loose deepEqual arrays with undefined and null failing 
The comparison has to accept these as identical.

Fixes: #61583
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@BridgeAR
BridgeAR committed Jan 30, 2026
commit 225a1fd542b04c27bc75ad1adf5f6d229c2d8f41
5 changes: 3 additions & 2 deletions lib/internal/util/comparisons.js
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Original file line number Diff line number Diff line change
Expand Up @@ -998,9 +998,10 @@ function objEquiv(a, b, mode, keys1, keys2, memos, iterationType) {
if (b[i] === undefined) {
if (!hasOwn(b, i))
return sparseArrayEquiv(a, b, mode, memos, i);
if (a[i] !== undefined || !hasOwn(a, i))
if ((a[i] !== undefined || !hasOwn(a, i)) && (mode !== kLoose || a[i] !== null))
return false;
} else if (a[i] === undefined || !innerDeepEqual(a[i], b[i], mode, memos)) {
} else if ((a[i] === undefined || !innerDeepEqual(a[i], b[i], mode, memos)) &&
(mode !== kLoose || b[i] !== null)) {
return false;
}
}
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12 changes: 12 additions & 0 deletions test/parallel/test-assert-deep.js
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Expand Up @@ -126,6 +126,11 @@ test('deepEqual', () => {
}
});

test('loose deepEqual', () => {
assertOnlyDeepEqual([null, undefined, undefined], [null, undefined, null]);
assertNotDeepOrStrict([null, undefined, undefined, 1], [null, undefined, null, 2]);
});

test('date', () => {
assertNotDeepOrStrict(date, date2);
assert.throws(
Expand Down Expand Up @@ -246,6 +251,13 @@ function assertOnlyDeepEqual(a, b, err) {
() => assert.deepStrictEqual(b, a),
err || { code: 'ERR_ASSERTION' }
);

const partial = mustCall(() => {
assert.partialDeepStrictEqual(b, a);
assert.partialDeepStrictEqual(a, b);
});

assert.throws(partial, err || { code: 'ERR_ASSERTION' });
}

test('es6 Maps and Sets', () => {
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