How to check if we have already created proxy on Object using ObservableSlim?

Question

I am using ObservableSlim to create proxy.

The create method of ObservableSlip will return a standard ES6 Proxy.

I have created a proxy on object like this:

const proxy = ObservableSlim.create(model, null, (changes) => {});

Problem:

How will i know that proxy is ES6 Proxy?

Regarding your problem specifically: https://github.com/ElliotNB/observable-slim#proxy-check — georg, Apr 12 '19 at 20:09
@georg I think it was not duplicated because of ObservableSlim. — Johar Zaman, Apr 12 '19 at 20:12

score 2 · Accepted Answer · answered Apr 12 '19 at 20:23

2

As covered here, this is impossible in the general case (without dirty hacks at least), because Proxy objects are by design transparent and mimic their targets on every system call.

However, library authors realize that that might be inconvenient sometimes and provide hooks in their Proxy objects so that the user can detect them. For the library in question, the returned Proxy exposes the property __isProxy for this exact purpose.

answered Apr 12 '19 at 20:23

georg

211,518
52
313
390

I didn't realize they had this functionality in their library. Thanks for pointing out. – Johar Zaman Apr 12 '19 at 20:25

score 1 · Answer 2 · answered Apr 12 '19 at 20:05

1

You can't from the codes perspective as Proxies are completely transparent.

The only one that knows that it is a Proxy is the console:

 console.log(proxy);

answered Apr 12 '19 at 20:05

Jonas Wilms

132,000
20
149
151

How to check if we have already created proxy on Object using ObservableSlim?

2 Answers2