1508968 - Calling toString on a Proxy object raises TypeError: Function.prototype.toString called on incompatible object

Status: RESOLVED DUPLICATE of bug 1440468

(Core :: JavaScript Engine, defect)

Description

[ali.baharev]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

Steps to reproduce:

I ran the following code in the Console:

const f = () => {}
const p = new Proxy(f, {})
console.log(f.toString())
console.log(p.toString())


Actual results:

Running the above code prints:

() => {}
TypeError: Function.prototype.toString called on incompatible object[Learn More]


Expected results:

It should have printed:

() => {}
() => {}

Comment 1

[Tom S [:evilpie]]

Btw, per https://tc39.github.io/Function-prototype-toString-revision/#proposal-sec-function.prototype.tostring the second must return something like "function() { [native code] }"

Comment 2

[ali.baharev]

Interesting, thanks for the info.