It looks like this is focused on primarily on executables, but there is a mention of libraries.

I was looking into WASM libraries recently, specifically WebAssembly Interface Types (WIT), and my conclusion is that WASM libraries are experimental and poorly supported right now (unless you only have i32/i64/f32/f64 as parameters and returns).

I couldn't find any elaboration in the documentation on libraries, what level of supported does this have? Is interface type implemented?