text: import sendgrid from 'sendgrid';
  import config from 'config';
  
  const sg = sendgrid(config.get('sendgrid.key'));
  
  export default function sendEmail(template, to, params, from = null) {
      if (process.env.NODE_ENV !== 'production') {
          console.log(
              `mail: to <${to}>, from <${from}>, template ${template} (not sent due to not production env)`
          );
          return;
      }
      const tmpl_id = config.get('sendgrid.templates')[template];
      if (!tmpl_id) throw new Error(`can't find template ${template}`);
  
      const request = sg.emptyRequest({
          method: 'POST',
          path: '/v3/mail/send',
          body: {
              template_id: tmpl_id,
              personalizations: [
                  {
                      to: [{ email: to }],
                      substitutions: params,
                  },
              ],
              from: { email: from || config.get('sendgrid.from') },
          },
      });
  
      sg.API(request)
          .then((response) => {
              console.log(
                  `sent '${template}' email to '${to}'`,
                  response.statusCode
              );
          })
          .catch((error) => {
              console.error(
                  `failed to send '${template}' email to '${to}'`,
                  error
              );
          });
  }
  