JavaScript for Adding a Document Library Email Alert for the loggged in User

SPO List Alerts.js

var ctx = SP.ClientContext.get_current();

this.user = ctx.get_web().get_currentUser();
this.alerts = this.user.get_alerts();
this.list = ctx.get_web().get_lists().getByTitle('Documents');

ctx.load(this.user);
ctx.load(this.alerts);
ctx.load(this.list);

ctx.executeQueryAsync(()=> {
  let alertTime = new Date();
  alertTime.setHours(alertTime.getHours() + 24);

  let notify = new SP.AlertCreationInformation;

  notify.set_title('Documents - Movers and Shakers');
  notify.set_alertFrequency(SP.AlertFrequency.daily);
  notify.set_alertType(SP.AlertType.list);
  notify.set_list(this.list);
  notify.set_deliveryChannels(SP.AlertDeliveryChannel.email);
  notify.set_alwaysNotify(true);
  notify.set_status(SP.AlertStatus.on);
  notify.set_alertTime(alertTime);
  //notify.set_user(this.user.get_loginName());
  notify.set_user(this.user);
  notify.set_eventType(SP.AlertEventType.all);

  // 0 = Anything Changes
  // 1 = Someone else changes a document
  // 2 = Someone else changes a document created by me
  // 3 = Someone else changes a document modified by me
  notify.Filter = '0';
  
  debugger;
  this.alerts.add(notify);
  this.user.update();  
  
  ctx.executeQueryAsync(()=> { console.log('CHEESE ON TOAST!'); debugger; }, ()=> { console.log('EGGS!'); })
}, ()=> {
  console.log('WORSE THAN EGGS!');
});

Similarly How do we delete the user alerts created for the library for a specific user. Can uou suggest JSOM code for this