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util: remove instance check on empty object #35754

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util: remove instance check on empty object #35754

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4c72c4c
util: remove instance check on empty object
Oct 22, 2020
8cea41d
util: remove instance check on empty object
Oct 22, 2020
e6c2f33
test: write tests for utils/inspect
Oct 22, 2020
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3 changes: 1 addition & 2 deletions lib/internal/util/inspect.js
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Original file line number Diff line number Diff line change
Expand Up @@ -541,8 +541,7 @@ function getConstructorName(obj, ctx, recurseTimes, protoProps) {
const descriptor = ObjectGetOwnPropertyDescriptor(obj, 'constructor');
if (descriptor !== undefined &&
typeof descriptor.value === 'function' &&
descriptor.value.name !== '' &&
tmp instanceof descriptor.value) {
descriptor.value.name !== '') {
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This change broke tests inspecting the prototype object, which is not an instance of its constructor.

if (protoProps !== undefined &&
(firstProto !== obj ||
!builtInObjects.has(descriptor.value.name))) {
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12 changes: 12 additions & 0 deletions test/parallel/test-util-inspect.js
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Original file line number Diff line number Diff line change
Expand Up @@ -623,6 +623,18 @@ assert.strictEqual(util.inspect(-5e-324), '-5e-324');
);
}

// Test for property descriptors on null/empty object
{
function prototype() {}
prototype.prototype = null;
const obj = {};
obj.constructor = prototype;
assert.strictEqual(
util.inspect(obj, false),
'prototype { constructor: [Function: prototype] }'
);
}

// Exceptions should print the error message, not '{}'.
{
[
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