import { SafariViewController } from '@awesome-cordova-plugins/safari-view-controller/ngx';
constructor(private safariViewController: SafariViewController) { }
...
this.safariViewController.isAvailable()
  .then((available: boolean) => {
      if (available) {
        this.safariViewController.show({
          url: 'http://ionic.io',
          hidden: false,
          animated: false,
          transition: 'curl',
          enterReaderModeIfAvailable: true,
          tintColor: '#ff0000'
        })
        .subscribe((result: any) => {
            if(result.event === 'opened') console.log('Opened');
            else if(result.event === 'loaded') console.log('Loaded');
            else if(result.event === 'closed') console.log('Closed');
          },
          (error: any) => console.error(error)
        );
      } else {
        
      }
    }
  );