How do i use complex types with the WebAssembly build?

[akowi-sknobloch]

Hello i hope someone here can help me understand how i can pass more complex types when building for WASM.
Every example i could find uses wasm-bindgen and wasm-pack.
But wasm-pack cannot compile to wasm32-unknown-emscripten so the build when using rust-skia fails.

I've tried to build upon the wasm-example from this project.
The Example works but as soon as i try complex types like String i run into issues regarding ffi support.
For my Project i have to send strings as well as images between JavaScript and Rust.
I don't understand how/if this is possible when building for wasm32-unknown-emscripten.

I've build a render-engine for our internal image generation needs to replace our current approach of using automation scripts with Adobe Photoshop & Illustrator.
I would really like to implement an web-based editor for the scene structure the engine uses.

If anyone would have some examples that achieve this I would be very thankful.