Update libs/hooks/debounce/src/lib/debounce-hook.ts

Co-authored-by: Lukas Reining <[email protected]>
Signed-off-by: Todd Baert <[email protected]>

Author: toddbaert

libs/hooks/debounce/src/lib/debounce-hook.ts

@@ -182,7 +182,7 @@ export class DebounceHook<T extends FlagValue = FlagValue> implements BaseHook {
     // server hooks can be async, web hooks can't, we have to handle both cases.
     try {
       const maybePromiseOrContext = hookCallback.call(this.innerHook);
-      if (maybePromiseOrContext && typeof maybePromiseOrContext.then === 'function') {
+      if (this.isPromise(maybePromiseOrContext)) {
         // async hook result; cache after promise resolves
         maybePromiseOrContext
           .then((maybeContext) => {
@@ -195,7 +195,7 @@ export class DebounceHook<T extends FlagValue = FlagValue> implements BaseHook {
           });
       } else {
         // sync hook result; cache now
-        this.cacheSuccess(cacheKey, stage, got, maybePromiseOrContext as void | EvaluationContext);
+        this.cacheSuccess(cacheKey, stage, got, maybePromiseOrContext);
       }
       return maybePromiseOrContext;
     } catch (error: unknown) {
@@ -204,6 +204,10 @@ export class DebounceHook<T extends FlagValue = FlagValue> implements BaseHook {
     }
   }
 
+  private isPromise<T>(value: T | Promise<T>): value is Promise<T> {
+    return !!value && typeof (value as Promise<unknown>).then === 'function';
+  }
+
   private cacheSuccess(
     key: string,
     stage: Stage,