how to make custom action for ng2 smart table code example

Example: ng2 smart table custom action

settings = {
hideSubHeader: true,
actions: {
  custom: [
    {
      name: 'yourAction',
      title: '<i class="ion-document" title="YourAction"></i>'
    },
    {
      name: 'editAction',
      title: '<i class="ion-edit" title="Edit"></i>'
    },
    {
      name: 'deleteAction',
      title: '<i class="far fa-trash-alt" title="delete"></i>'
    }
  ],
  add: false,
  edit: false,
  delete: false
}
...
};