Revised prototype

Author: eggyal

crates/backend/src/ast.rs

@@ -51,6 +51,8 @@ pub struct Export {
     /// Whether or not this function should be flagged as the wasm start
     /// function.
     pub start: bool,
+    /// Constructor arguments excluding synthetic callbacks
+    pub constructor_args: Option<Vec<Ident>>,
 }
 
 /// The 3 types variations of `self`.
@@ -223,6 +225,7 @@ pub struct Struct {
     pub js_name: String,
     pub fields: Vec<StructField>,
     pub comments: Vec<String>,
+    pub prototype: Option<syn::Path>,
 }
 
 #[cfg_attr(feature = "extra-traits", derive(Debug, PartialEq, Eq))]