JSObjectReference

[MackinnonBuck]

Summary

• Modified JS interop to use the new mono_wasm_invoke_js_blazor function.
• Added support for indicating special JS interop return values (e.g., a JSObjectReference), along with the ability to specify which object instance is handling the invocation.
• Added JSObjectReference, which supports invoking functions from JS objects.
• Added the ability to pass a JSObjectReference instance as a parameter to a JS interop call.
• Added support for synchronous JS interop calls via JSInProcessObjectReference.
• Added DotNet.createJSObjectReference to allow passing JS objects to .NET. and DotNet.disposeJSObjectReference to allow disposal from JS when it's most convenient.
• Added some functional/E2E tests.

TODO

• Add support for unmarshalled JS interop calls via JSUnmarshalledObjectReference (dependent on InputFile Component #24640).
  • Update: This will likely get done in a follow-up PR, as it's not a critical piece of functionality.

Addresses #24648

[javiercn]

Looks like a great start!

[javiercn]

This looks fantastic so far!

I don't have a lot of meaningful feedback because everything seems to be very well thought/written!

I would like to see a few more unit tests and so on, but other than that, it looks great!

We might also want the equivalent of DotnetObjectRef.Create on the JS side so that JS objects can be turned into JSObjectReferences for use when invoking .NET.

[SteveSandersonMS]

This looks pretty super to me. I haven't pored over every line of it yet, or tried to think of any ways it could be misused, but it's looking very strong so far.

[Unmarshalled calls] Update: This will likely get done in a follow-up PR, as it's not a critical piece of functionality.

It sounds fine to me that we could add unmarshalled JSObject support in RC2. It's the sort of change that would have a really clear boundary and be quite easy to test. And there would be limited concerns around security since by definition it can only exist on the WebAssembly runtime.

[captainsafia]

Thanks for working on this. Learned a lot while reading through your PR. Left a few questions inline.

[mrlife]

Will JSObjectReference be available in Server-Side Blazor or is it a WASM-only feature?

[SteveSandersonMS]

@mrlife It works on both.

[RemiBou]

Congrats for this PR, I did this here but in way less efficient way I think. Can't wait to remove all my code!