Use node resolution for imports from npm packages

src/module_loader.rs

@@ -232,6 +232,7 @@ mod test {
     async fn test_import_provider() {
         let loader = RustyLoader::new(LoaderOptions {
             import_provider: Some(Box::new(TestImportProvider::new())),
+            cwd: std::env::current_dir().unwrap(),
             ..LoaderOptions::default()
         });
         let expected_responses = [

src/module_loader/inner_loader.rs

@@ -164,6 +164,11 @@ impl InnerRustyLoader {
         referrer: &str,
         kind: deno_core::ResolutionKind,
     ) -> Result<ModuleSpecifier, ModuleLoaderError> {
+        #[cfg(feature = "node_experimental")]
+        let referrer_specifier = referrer
+            .to_module_specifier(&self.cwd)
+            .map_err(|e| JsErrorBox::from_err(to_io_err(e)))?;
+
         //
         // Handle import aliasing for node imports
         #[cfg(feature = "node_experimental")]
@@ -178,6 +183,15 @@ impl InnerRustyLoader {
             return self.load_npm(specifier, referrer);
         }
 
+        //
+        // Use node resolution if we're in an npm package
+        #[cfg(feature = "node_experimental")]
+        if referrer_specifier.scheme() == "file"
+            && self.node.rusty_resolver.in_npm_package(&referrer_specifier)
+        {
+            return self.load_npm(specifier, referrer);
+        }
+
         // Resolve the module specifier to an absolute URL
         let url = deno_core::resolve_import(specifier, referrer)?;