How can I pass an object as an input to a method?

[karaggeorge]

Thank you so much for this project! It's been amazing so far. I'm reading through old issues and learning how to use all the different patterns. This is something I haven't found an example for yet:

I have a struct like:

struct Options {
	let destination: String
	let framesPerSecond: Int
	let cropRect: CGRect?
}

I'd like to expose a function that can take an object from js as input that has this shape, and then somehow type-cast it in Swift to use it as the struct

So I could for example do options.destination

[kabiroberai]

Converting objects to structs sounds like a good idea, and I'd eventually like to support parsing TypeScript interfaces which would make something like this possible. In the meantime, however, two options you can try are:

1. Make your struct Codable and round-trip through a JSON string. This incurs a slight perf overhead on the Swift side (JSON on the Node.js side is incredibly efficient) but for a small struct like the one in your example it's probably just fine.
2. Take a NodeObject as a parameter and add an @NodeActor init(object: NodeObject) throws initializer to Options. You could then extract the fields like

@NodeActor init(object: NodeObject) throws {
  // TODO: handle optionals by throwing
  self.destination = try object.destination.as(String.self)!
  // ...
}