Check if emojis are invalid

Source/Errors.swift

@@ -8,5 +8,6 @@ public enum StickersError: Error {
     case dataTypeMismatch
     case setIsEmpty
     case emojiIsEmpty
+    case emojisInvalid
     case telegramNotInstalled
 }

Source/StickerSet.swift

@@ -130,10 +130,18 @@ public class StickerSet {
         if emojis.isEmpty {
             throw StickersError.emojiIsEmpty
         }
+        if !arrayContainsEmoji(array: emojis) {
+            throw StickersError.emojisInvalid
+        }
         if try self.validateData(data) {
             self.stickers.append(Sticker(data: data, emojis: emojis))
         }
     }
+
+    /// Returns true if an array contains at least 1 valid emoji
+    func arrayContainsEmoji(array: [String]) -> Bool {
+        return array.contains { $0.containsEmoji }
+    }
 
     /**
         Sets a thumbnail of the sticker set using the provided data.

Source/StringExtension.swift

@@ -0,0 +1,11 @@
+extension String {
+    /// Checks if a string is a valid emoji
+    var containsEmoji: Bool {
+        for scalar in self.unicodeScalars {
+            if scalar.properties.isEmoji && (scalar.value > 0x238C) { // Exclude non-graphical symbols
+                return true
+            }
+        }
+        return false
+    }
+}