Save Object.observe()! (please) + make WeakMap/WeakSet observable.

[Tom Van Cutsem]

2015-11-04 0:22 GMT+01:00 Coroutines <coroutines at gmail.com>:

>
> With Object.observe() you get a global view of events generated by the
> target object, with Proxy you need to replace references to the target
> object with references to the Proxy.
>
> Now I'm changing my opinion again.  We need both.
>

I won't speak to whether we really need both, but your analysis that they
cater to different use cases is correct:

- O.o allows one to asynchronously observe (not intercept) operations on
another one's objects. This is safe.

- Proxies allow one to synchronously intercept operations on one's own
objects. This is safe.

- Proxies can obviously also be used to just observe one's own objects. As
an existence proof, I once did a simple O.o polyfill using proxies <
https://github.com/tvcutsem/harmony-reflect/blob/master/examples/observer.js>.
This is not generally useful though.

- Proxy.startTrapping would allow one to synchronously intercept operations
on another one's objects. This way lies madness. Don't go there.

Cheers,
Tom
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