diff --git a/bindings/nodejs/index.d.ts b/bindings/nodejs/index.d.ts
index 591b8349..af3e13f8 100644
--- a/bindings/nodejs/index.d.ts
+++ b/bindings/nodejs/index.d.ts
@@ -3,7 +3,7 @@
 export declare class ZenDecision {
   constructor()
   evaluate(context: any, opts?: ZenEvaluateOptions | undefined | null): Promise<ZenEngineResponse>
-  safeEvaluate(context: any, opts?: ZenEvaluateOptions | undefined | null): { success: true, data: ZenEngineResponse } | { success: false; error: any; }
+  safeEvaluate(context: any, opts?: ZenEvaluateOptions | undefined | null): Promise<{ success: true, data: ZenEngineResponse } | { success: false; error: any; }>
   validate(): void
 }
 
@@ -17,8 +17,8 @@ export declare class ZenEngine {
   evaluate(key: string, context: any, opts?: ZenEvaluateOptions | undefined | null): Promise<ZenEngineResponse>
   createDecision(content: ZenDecisionContent | Buffer | object): ZenDecision
   getDecision(key: string): Promise<ZenDecision>
-  safeEvaluate(key: string, context: any, opts?: ZenEvaluateOptions | undefined | null): { success: true, data: ZenEngineResponse } | { success: false; error: any; }
-  safeGetDecision(key: string): { success: true, data: ZenDecision } | { success: false; error: any; }
+  safeEvaluate(key: string, context: any, opts?: ZenEvaluateOptions | undefined | null): Promise<{ success: true, data: ZenEngineResponse } | { success: false; error: any; }>
+  safeGetDecision(key: string): Promise<{ success: true, data: ZenDecision } | { success: false; error: any; }>
   dispose(): void
 }
 
diff --git a/bindings/nodejs/src/decision.rs b/bindings/nodejs/src/decision.rs
index 6ca3839c..7e16a198 100644
--- a/bindings/nodejs/src/decision.rs
+++ b/bindings/nodejs/src/decision.rs
@@ -47,7 +47,7 @@ impl ZenDecision {
     }
 
     #[napi(
-        ts_return_type = "{ success: true, data: ZenEngineResponse } | { success: false; error: any; }"
+        ts_return_type = "Promise<{ success: true, data: ZenEngineResponse } | { success: false; error: any; }>"
     )]
     pub async fn safe_evaluate(
         &self,
diff --git a/bindings/nodejs/src/engine.rs b/bindings/nodejs/src/engine.rs
index 4665ca8b..6e25cb1e 100644
--- a/bindings/nodejs/src/engine.rs
+++ b/bindings/nodejs/src/engine.rs
@@ -253,7 +253,7 @@ impl ZenEngine {
     }
 
     #[napi(
-        ts_return_type = "{ success: true, data: ZenEngineResponse } | { success: false; error: any; }"
+        ts_return_type = "Promise<{ success: true, data: ZenEngineResponse } | { success: false; error: any; }>"
     )]
     pub async fn safe_evaluate(
         &self,
@@ -265,7 +265,7 @@ impl ZenEngine {
     }
 
     #[napi(
-        ts_return_type = "{ success: true, data: ZenDecision } | { success: false; error: any; }"
+        ts_return_type = "Promise<{ success: true, data: ZenDecision } | { success: false; error: any; }>"
     )]
     pub async fn safe_get_decision(&self, key: String) -> SafeResult<ZenDecision> {
         self.get_decision(key).await.into()