Method addCustomEmoji

trace/trace.ts:109–121

(placeholder: string, documentId: BigInteger)

          const offset = this.calculateOffset(this.text);
          const length = placeholder.length; // Simple length calculation
          this.text += placeholder;
          
          this.entities.push(
              new Api.MessageEntityCustomEmoji({
                  offset,
                  length,
                  documentId
              })
          );
      }
      
      private calculateOffset(text: string): number {
          // Telegram uses UTF-16 code units for offset calculation
          return text.length;
      }