diff --git a/guest-js/index.ts b/guest-js/index.ts
index 8dd6855..3848d84 100644
--- a/guest-js/index.ts
+++ b/guest-js/index.ts
@@ -4,10 +4,12 @@ type DuckResponse = {
   success: boolean
 }
 
-export async function duck(): Promise<string | null> {
-  return await invoke<{value?: string}>('plugin:duck|duck').then((r: DuckResponse) => r.success);
+export async function duck(): Promise<boolean | null> {
+  // @ts-expect-error - not typed
+  return await invoke('plugin:duck|duck').then((r: DuckResponse) => r.success);
 }
 
-export async function unduck(value: string): Promise<boolean | null> {
-  return await invoke<{value?: string}>('plugin:duck|unduck').then((r: DuckResponse) => r.success);
+export async function unduck(): Promise<boolean | null> {
+  // @ts-expect-error - not typed
+  return await invoke('plugin:duck|unduck').then((r: DuckResponse) => r.success);
 }