Fix build save path with '?external=*' (#1036)

Author: ije

server/router.go

@@ -1201,6 +1201,9 @@ func esmRouter(db DB, buildStorage storage.Storage) rex.Handle {
 			// build/dts files
 			if pathKind == EsmBuild || pathKind == EsmSourceMap || pathKind == EsmDts {
 				var savePath string
+				if asteriskPrefix {
+					pathname = "/*" + pathname[1:]
+				}
 				if pathKind == EsmDts {
 					savePath = path.Join("types", pathname)
 				} else {
@@ -1654,7 +1657,7 @@ func esmRouter(db DB, buildStorage storage.Storage) rex.Handle {
 				return buf.Bytes()
 			}
 			savePath := buildCtx.getSavepath()
-			if strings.HasSuffix(esm.SubPath, ".css") {
+			if strings.HasSuffix(esm.SubPath, ".css") && ret.CSSInJS {
 				path, _ := utils.SplitByLastByte(savePath, '.')
 				savePath = path + ".css"
 			}

test/fix-url/test.ts

@@ -167,3 +167,16 @@ Deno.test("[workaround] force the dependency version of react equals to react-do
   const js = await res.text();
   assertStringIncludes(js, '"/[email protected]/es2022/react.mjs"');
 });
+
+Deno.test("fix external save path", async () => {
+  // non-external module
+  {
+    const res = await fetch("http://localhost:8080/[email protected]/es2022/hooks.mjs");
+    assertStringIncludes(await res.text(), 'from"/[email protected]/es2022/preact.mjs"');
+  }
+  // in https://github.com/preactjs/preact-www/issues/1225, the module returns the non-external module
+  {
+    const res = await fetch("http://localhost:8080/*[email protected]/es2022/hooks.mjs");
+    assertStringIncludes(await res.text(), 'from"preact"');
+  }
+});