fix: add warning

client.go

@@ -340,10 +340,13 @@ func (uc *Client) isEnabled(feature string, options ...FeatureOption) api.Strate
 }
 
 func (uc *Client) isParentDependencySatisfied(feature *api.Feature, context context.Context) bool {
+	warnOnce := &WarnOnce{}
+
 	for _, parent := range *feature.Dependencies {
 		parentToggle := uc.repository.getToggle(parent.Feature)
 
 		if parentToggle == nil {
+			warnOnce.Warn("the parent toggle was not found in the cache, the evaluation of this dependency will always be false")
 			return false
 		}
 

utils.go

@@ -5,6 +5,7 @@ import (
 	"math/rand"
 	"os"
 	"os/user"
+	"sync"
 	"time"
 )
 
@@ -43,3 +44,15 @@ func contains(arr []string, str string) bool {
 	}
 	return false
 }
+
+// WarnOnce is a type for handling warnings that should only be displayed once.
+type WarnOnce struct {
+	once sync.Once
+}
+
+// Warn logs the warning message once.
+func (wo *WarnOnce) Warn(message string) {
+	wo.once.Do(func() {
+		fmt.Println("Warning:", message)
+	})
+}