fix #17177 (#17243)

* remove unnecessary when statement

* remove outdated codes

* fix #17177

* add testcase

2 files changed, 13 insertions, 2 deletions

diff --git a/lib/js/asyncjs.nim b/lib/js/asyncjs.nim
index 45053fbaa..b42ce45d8 100644
--- a/lib/js/asyncjs.nim
+++ b/lib/js/asyncjs.nim
@@ -118,10 +118,11 @@ proc generateJsasync(arg: NimNode): NimNode =
     var resolve: NimNode
     if isVoid:
       resolve = quote:
-        var `jsResolve` {.importcpp: "undefined".}: Future[void]
+        var `jsResolve` {.importjs: "undefined".}: Future[void]
     else:
       resolve = quote:
-        proc jsResolve[T](a: T): Future[T] {.importcpp: "#", used.}
+        proc jsResolve[T](a: T): Future[T] {.importjs: "#", used.}
+        proc jsResolve[T](a: Future[T]): Future[T] {.importjs: "#", used.}
     result.body.add(resolve)
   else:
     result.body = newEmptyNode()
diff --git a/tests/js/t17177.nim b/tests/js/t17177.nim
new file mode 100644
index 000000000..fc362cec1
--- /dev/null
+++ b/tests/js/t17177.nim
@@ -0,0 +1,10 @@
+import std/asyncjs
+
+proc fn1(n: int): Future[int] {.async.} = return n
+proc main2() =
+  proc fn2(n: int): Future[int] {.async.} = return n
+proc main3(a: auto) =
+  proc fn3(n: int): Future[int] {.async.} = return n
+proc main4() {.async.} =
+  proc fn4(n: int): Future[int] {.async.} = return n
+  discard