What is the reason for not spread (es 6 spread operator) javascript Error object [duplicate]

I'm trying to spread the Javascript Error object(Standard built-in objects). I'm getting the empty object as output.

let error = new Error('error');



What is the reason for not spreading the Error object?



This is because the spread syntax in object literals "copies own enumerable properties from a provided object onto a new object".

None of the own properties of your Error object are enumerable.

var error = new Error('error');
var props = Object.getOwnPropertyDescriptors(error);
console.log(props); // none of these are enumerable

So the spread syntax copies nothing. If it had an enumerable value, then it would have copied it:

var error = new Error('error');
error.foo = 'bar';


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