Accessing Embedded Runtime Exports from External Languages

[esarver]

I'm fairly new to this but am really excited about the idea of using wasmer as an embedded scripting language for game engines and embedded systems.

How can I access the symbols that I export as part of my embedded runtime in other languages that will compile down to WASM?

As an example:
I create a wasmer runtime as part of my rust executable. In that executable I add foo() and bar() to the runtime as function that call into the native code.

Now let's say another user wants to write a program that will run within my WASM environment in C#.

Here are my Questions

1. How can that user make use of the symbols that I added to the runtime?
2. Do I need to provide library declarations (similar to a C++ header file) to that user so their tooling (e.g. Visual Studio, or their compiler) knows what is available?
3. Do I need to create a WASM library that wraps my API so they have something to link against?
4. Is there any automated tooling for exporting language symbols from a WASM binary?

This might be similar to what is being asked in #3206, but I'm not sure.