fix: treeshaking of local package references (#128)

Author: Guy Bedford

crates/spidermonkey-embedding-splicer/src/bindgen.rs

@@ -83,6 +83,8 @@ struct JsBindgen<'a> {
     esm_bindgen: EsmBindgen,
     local_names: LocalNames,
 
+    local_package_name: String,
+
     resolve: &'a Resolve,
     world: WorldId,
     sizes: SizeAlign,
@@ -133,6 +135,7 @@ pub fn componentize_bindgen(
     guest_exports: &Vec<String>,
     features: Vec<Features>,
 ) -> Result<Componentization> {
+    let local_package_name = resolve.id_of_name(resolve.worlds[id].package.unwrap(), "");
     let mut bindgen = JsBindgen {
         src: Source::default(),
         esm_bindgen: EsmBindgen::default(),
@@ -143,6 +146,7 @@ pub fn componentize_bindgen(
         sizes: SizeAlign::default(),
         memory: "$memory".to_string(),
         realloc: "$realloc".to_string(),
+        local_package_name,
         exports: Vec::new(),
         imports: Vec::new(),
         resource_directions: HashMap::new(),
@@ -521,7 +525,9 @@ impl JsBindgen<'_> {
     fn imports_bindgen(&mut self, guest_imports: &Vec<String>) {
         for (key, impt) in &self.resolve.worlds[self.world].imports {
             let import_name = self.resolve.name_world_key(key);
-            if !guest_imports.contains(&import_name) {
+            if !guest_imports.contains(&import_name)
+                && !import_name.starts_with(&self.local_package_name)
+            {
                 continue;
             }
             match &impt {