fix(es/module): Do not determine module name for modules without exports in UMD

crates/swc_ecma_transforms_module/src/umd.rs

@@ -110,9 +110,6 @@ where
     fn visit_mut_module(&mut self, module: &mut Module) {
         let import_interop = self.config.config.import_interop();
 
-        let filename = self.cm.span_to_filename(module.span);
-        let exported_name = self.config.determine_export_name(filename);
-
         let module_items = &mut module.body;
 
         let mut strip = ModuleDeclStrip::new(self.const_var_kind);
@@ -170,7 +167,7 @@ where
         //  Emit
         // ====================
 
-        let (adapter_fn_expr, factory_params) = self.adapter(exported_name, is_export_assign);
+        let (adapter_fn_expr, factory_params) = self.adapter(module.span, is_export_assign);
 
         let factory_fn_expr: Expr = Function {
             params: factory_params,
@@ -341,7 +338,7 @@ where
     /// });
     /// ```
     /// Return: adapter expr and factory params
-    fn adapter(&mut self, exported_name: Ident, is_export_assign: bool) -> (FnExpr, Vec<Param>) {
+    fn adapter(&mut self, module_span: Span, is_export_assign: bool) -> (FnExpr, Vec<Param>) {
         macro_rules! js_typeof {
             ($test:expr =>! $type:expr) => {
                 Expr::Unary(UnaryExpr {
@@ -375,7 +372,6 @@ where
         let factory = private_ident!("factory");
 
         let module_exports = module.clone().make_member(quote_ident!("exports"));
-        let global_lib = global.clone().make_member(exported_name);
         let define_amd = define.clone().make_member(quote_ident!("amd"));
 
         let mut cjs_args = vec![];
@@ -385,6 +381,10 @@ where
         let mut factory_params = vec![];
 
         if !is_export_assign && self.exports.is_some() {
+            let filename = self.cm.span_to_filename(module_span);
+            let exported_name = self.config.determine_export_name(filename);
+            let global_lib = global.clone().make_member(exported_name);
+
             cjs_args.push(quote_ident!("exports").as_arg());
             amd_dep_list.push(Some(quote_str!("exports").as_arg()));
             browser_args.push(

node-swc/__tests__/module_test.js

@@ -47,3 +47,20 @@ it("should work with amd and external helpers", () => {
     expect(out.code).toContain(`_class_call_check._(this, Foo);`);
     expect(out.code).toContain(`_inherits._(Bar, Foo);`);
 });
+
+it('should not require filename if no exports in umd', () => {
+    const code = `console.log('test')`;
+
+    const out = swc.transformSync(code, {
+        jsc: {
+            parser: {
+                syntax: 'ecmascript',
+            },
+        },
+        module: {
+            type: 'umd',
+        },
+        isModule: true,
+    });
+    expect(out.code).toContain(`function(global`);
+});