Allow passthrough.

Author: tido64

ios/RNCAsyncStorage.m

@@ -357,6 +357,11 @@ - (void)_multiGet:(NSArray<NSString *> *)keys
   callback(@[RCTNullIfNil(errors), result]);
 }
 
+- (BOOL)_passthroughDelegate
+{
+    return [self.delegate respondsToSelector:@selector(isPassthrough)] && self.delegate.isPassthrough;
+}
+
 #pragma mark - Exported JS Functions
 
 RCT_EXPORT_METHOD(multiGet:(NSArray<NSString *> *)keys
@@ -380,7 +385,10 @@ - (void)_multiGet:(NSArray<NSString *> *)keys
                         }
                       }];
     }];
-    return;
+
+    if (![self _passthroughDelegate]) {
+      return;
+    }
   }
 
   NSDictionary *errorOut = [self _ensureSetup];
@@ -409,7 +417,10 @@ - (void)_multiGet:(NSArray<NSString *> *)keys
       NSArray<NSDictionary *> *errors = RCTMakeErrors(results);
       callback(@[RCTNullIfNil(errors)]);
     }];
-    return;
+
+    if (![self _passthroughDelegate]) {
+      return;
+    }
   }
 
   NSDictionary *errorOut = [self _ensureSetup];
@@ -443,7 +454,10 @@ - (void)_multiGet:(NSArray<NSString *> *)keys
       NSArray<NSDictionary *> *errors = RCTMakeErrors(results);
       callback(@[RCTNullIfNil(errors)]);
     }];
-    return;
+
+    if (![self _passthroughDelegate]) {
+      return;
+    }
   }
 
   NSDictionary *errorOut = [self _ensureSetup];
@@ -487,7 +501,10 @@ - (void)_multiGet:(NSArray<NSString *> *)keys
       NSArray<NSDictionary *> *errors = RCTMakeErrors(results);
       callback(@[RCTNullIfNil(errors)]);
     }];
-    return;
+
+    if (![self _passthroughDelegate]) {
+      return;
+    }
   }
 
   NSDictionary *errorOut = [self _ensureSetup];
@@ -543,7 +560,10 @@ - (void)_multiGet:(NSArray<NSString *> *)keys
     [self.delegate allKeys:^(NSArray<id<NSObject>> *keys) {
       callback(@[(id)kCFNull, keys]);
     }];
-    return;
+
+    if (![self _passthroughDelegate]) {
+      return;
+    }
   }
 
   NSDictionary *errorOut = [self _ensureSetup];

ios/RNCAsyncStorageDelegate.h

@@ -32,6 +32,10 @@ typedef void (^RNCAsyncStorageResultCallback)(NSArray<id<NSObject>> * valuesOrEr
 - (void)valuesForKeys:(NSArray<NSString *> *)keys
            completion:(RNCAsyncStorageResultCallback)block;
 
+@optional
+
+@property (nonatomic, readonly, getter=isPassthrough) BOOL passthrough;
+
 @end
 
 NS_ASSUME_NONNULL_END