Property __key__ is empty with node

I created a simple datastore (projects) with one string property (name) and some example datasets.

When I use gql I can select the __key__ and can query by the __key__ property.

But when I select the data from nodejs, the __key__ property is empty.

examples:

not working: selecting all datasets with key-only query:

const query = datastore.createQuery('Projects').select('__key__');

datastore.runQuery(query).then( results => {

  console.log('RESULTS:', results[0]);
})

result:

RESULTS: [ {}, {}, {} ]

A normal query works as expected:

datastore.runQuery(query).then( results => {

  console.log('RESULTS:', results[0]);
})

.. but here also the __key__ property is missing:

RESULTS: [ { name: 'Test Projekt 1' },
  { name: 'Test Projekt 2' },
  { name: 'Test Projekt 3' } ]

How do I select the __key__ property with the @google-cloud/datastore module correctly?

via alwe