[core] only rewrite actual urls for dynamic imports

Author: velzie

rewriter/js/src/visitor.rs

@@ -185,7 +185,7 @@ where
 
 	fn visit_import_declaration(&mut self, it: &ImportDeclaration<'data>) {
     	let str = it.source.to_string();
-	    if str.contains(":") || str.starts_with("/") || str.starts_with("./") || str.starts_with("../") {
+	    if str.contains(":") || str.starts_with("/") || str.starts_with(".") || str.starts_with("..") {
 	    	self.rewrite_url(&it.source,true);
 		}
 		walk::walk_import_declaration(self, it);

src/client/shared/import.ts

@@ -8,9 +8,20 @@ export default function (client: ScramjetClient, self: Self) {
 	self[config.globals.importfn] = function (base: string, url: string) {
 		const resolved = new URL(url, base).href;
 
-		return Function(
-			`return import("${rewriteUrl(resolved, client.meta)}?type=module")`
-		)();
+		if (
+			url.includes(":") ||
+			url.startsWith("/") ||
+			url.startsWith(".") ||
+			url.startsWith("..")
+		) {
+			// this is a url
+			return Function(
+				`return import("${rewriteUrl(resolved, client.meta)}?type=module")`
+			)();
+		} else {
+			// this is a specifier handled by importmaps
+			return Function(`return import("${url}")`)();
+		}
 	};
 
 	self[config.globals.metafn] = function (base: string) {