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proxies can do this relatively easily.[0]

Here's a minimal fiddle doing just that: https://jsfiddle.net/6v82dj01/

As for actual implementations, I used it in a small analyzer for RPG Maker MV plugins[1] that roughly does what you want with very little actual code[2].

[0]: http://exploringjs.com/es6/ch_proxies.html#sec_proxies-expla... [1]: https://github.com/ldd/plugin-analyzer [2]:https://github.com/ldd/plugin-analyzer/blob/master/plugin-an...

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yes, but you have to manually select which objects to watch, eg in your script, it goes through the window object and adds the Proxy observer to a set of classes. But Iroh doesn't use Proxies. With Iroh you can trigger an event for example "Iroh.MEMBER" and check if the property is undefined.

I only observe certain classes because observing anything and everything is not convenient. Nothing prevents you from doing

`window = new Proxy(window, handler)`

(or more generally, to Proxy the global object) where the handler replaces anything with a Proxied version of it either once a trap triggers (yu-gi-oh style) or immediately.

Then again, I did not write the specification for `Proxy` and Iroh is cool. It probably has plenty of use-cases where Proxy would not do a good job. I'm just showing what we have right now.

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