Are realms the only way to round trip a mutable object from Rust -> JS and back?

[tom-sherman]

I want to pass an object into the default function export of a Module. That function will mutate the object I pass in. When that function has finished executing (or the promise it returns has resolved) I want to use that updated object on the Rust side.

I saw the example using realms but was wondering if there's an easier way.

[jedel1043]

For now yes, but I think with #3802 you will be able to inject data to the context itself.

[tom-sherman]

Thanks. Are there any examples of what I'm trying to achieve here?

I wanna insert an object in, allow JS to modify it, and then read it back out. I'm happy to clone/snapshot the object for that last step.