i am completely new to appscript but am trying to solve this issue for my team.
Basically we have a script that runs a dashboard for monitoring daily tasks progress. There is supposed to be an alert requesting user to re-assign checker based on code below, but it’s not working – no prompt / alert when we click on ‘re-assign’> ‘Checker’. Any help is appreciated, thank you in advance!

      Swal.fire({
      title: 'Select new reviewer',
      input: 'select',
      inputOptions: inputOptionsPromise,
      inputPlaceholder: 'Select new reviewer',
      showCancelButton: true,
      inputValidator: function(value) {
        return new Promise(function(resolve, reject) {
          if (value != '') {
            resolve();
          } else {
            reject('You need to select a reviewer')
            alert('Select reviewer required')
          }
        })
      }
    }).then((address) => {
      if (address.isConfirmed) {
      Swal.fire({
        type: 'success',
        html: 'Reviewer has been changed to: ' + address.value