TypeError: clazz is not a constructor on ≥ v11.6.0

[nakhodkin]

I'm experiencing an issue with a following piece of code

'use strict';

const people = [
 ['John', 19, 'm'],
 ['Valentine', 28, 'f'],
 ['Christina', 25, 'f']
];

class Person {
 get name() {
 return this[0];
 }
 
 get age() {
 return this[1];
 }
 
 get sex() {
 return this[2];
 }
}

people.forEach(person => Object.setPrototypeOf(person, Person.prototype));

const query = person => person.age > 25;

people.filter(query);

You can see a more detailed information about the stacktrace right below

• Node: v11.6.0:
• Platform: macOS Mojave Version 10.14.2:

[mscdex]

There probably is a bug here with util.inspect(), but the issue here is that you overwriting each array's prototype (Array.prototype) with Person.prototype, so when you try to access the getter, the indexed properties no longer work because those are implemented by Array.prototype.

[mscdex]

You can fix the prototype issue by changing class Person to class Person extends Array and then you will get the expected result.

[devsnek]

this happens with the indexed/keyed collections when they have the right internal slots but the wrong prototype (prototype constructor is missing, from noIteratorPrototype util). I think it's worth fixing.

[BridgeAR]

Yes, there's a check missing if the prototype is null or not.

If it is not null, we should keep the prototype and fall back to the regular object inspection.