Add support for modules to the backend.

crates/backend/src/ast.rs

@@ -19,6 +19,19 @@ pub struct Program {
     pub structs: Vec<Struct>,
     /// rust consts
     pub consts: Vec<Const>,
+    /// rust submodules
+    pub modules: Vec<Module>,
+}
+
+/// A rust module
+///
+/// This exists to give the ability to namespace js imports.
+#[cfg_attr(feature = "extra-traits", derive(Debug, PartialEq, Eq))]
+pub struct Module {
+    /// module name
+    pub name: String,
+    /// js -> rust interfaces
+    pub imports: Vec<Import>,
 }
 
 /// A rust to js interface. Allows interaction with rust objects/functions
@@ -227,6 +240,8 @@ impl Program {
             structs: self.structs.iter().map(|a| a.shared()).collect(),
             enums: self.enums.iter().map(|a| a.shared()).collect(),
             imports: self.imports.iter()
+                // add in imports from inside modules
+                .chain(self.modules.iter().flat_map(|m| m.imports.iter()))
                 .map(|a| a.shared())
                 .collect::<Result<_, Diagnostic>>()?,
             version: shared::version(),