895043 - Object.getOwnPropertyNames(new Error('bla')).length === 0 (should be 1)

Status: RESOLVED DUPLICATE of bug 724768

(Core :: JavaScript Engine, defect)

Description

[David Bruant]

var e = new Error('bla');
console.log(Object.getOwnPropertyNames(e).length) // 0, should be 1
console.log(e.message) // 'bla' as expected
console.log(Object.getOwnPropertyNames(e).length) // 1 as expected

I imagine that getting the property makes it appear in some way. In any case, the second line has an unexpected behavior.

Comment 1

[David Bruant]

In case it's not obvious, in both cases, the Object.getOwnPropertyNames(e) should be ['message']

Comment 2

[David Bruant]

Also, check if the bug is in other error types just in case ;-)

Comment 3

[Till Schneidereit [:till]]

Hu, interesting. I bet Waldo has some idea of what's going on.