code: public KnownCustomEmoji getOrCreateKnownCustomEmoji(Server server, JsonNode data) {
          long id = Long.parseLong(data.get("id").asText());
          return customEmojis.computeIfAbsent(id, key -> new KnownCustomEmojiImpl(this, server, data));
      }
docs: Gets or creates a new known custom emoji object.
  
  @param server The server of the emoji.
  @param data The data of the emoji.
  @return The emoji for the given json object.