Struct Interface 

pub struct Interface {
    pub name: &'static str,
    pub fields: &'static [(&'static str, &'static str)],
}

An interface not modeled as a Rust struct (e.g. ad-hoc WASM return shapes).

Fields

name: &'static str

Interface name.

fields: &'static [(&'static str, &'static str)]

Fields: (name, type). All emitted as readonly/covariant.