gapi.load('client', () => {

gapi.client.load('storage', 'v1', authResult =>{

gapi.auth.authorize({
      client_id: CLIENT_ID,
      scope: SCOPES,
      immediate: false
    },authResult=>{

      if (authResult && !authResult.error) {
        var request = gapi.client.storage.buckets.list({
          'project': PROJECT_ID
        });
        request.execute(function(resp) {
          console.log(resp)
        });

    } else {
       alert("Un-Authorised")
    }


    });

});

});