prepareSlackMessage.ts

 private async sendSlackMessage(countVulnerabilities: number, packageName: string): Promise<void> {
    const postData = {
      attachments: [
        {
          author_name: 'YARN - AUDIT',
          color: '#ff0000',
          mrkdwn_in: ['text', 'pretext'],
          text: `Found *${countVulnerabilities}* vulnerabilities in _${packageName}_ project, for more details run _yarn audit_`,
        },
      ],
      channel: `#packages-vulnerabilities`,
      icon_emoji: ':warning:',
      mrkdwn: true,
      username: 'YARN Audit Alert',
    };

    const result = await this.client.post('', {
      body: postData,
    });

    if (!result.ok) {
      throw new Error('The message cannot be delivered');
    }
  }