Problem

After running gcloud beta auth application-default login I should be able to use google-cloud-node to access Google Cloud Platform services, but I can't. I must set the GCLOUD_PROJECT env var or explicitly pass a project ID to a client for google-cloud-node to work.

Steps to reproduce

1. Install the Google Cloud SDK, git, Node.js and NPM
2. Run gcloud init, you'll be prompted to set a default project
3. Run gcloud beta auth application-default login and follow the OAuth 2.0 flow to login
4. Clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git
5. Run cd nodejs-docs-samples/storage
6. Run npm install
7. Run node buckets.js list

Observe the error:

Error: Sorry, we cannot connect to Google Cloud Services without a project ID. You may
specify one with an environment variable named "GCLOUD_PROJECT". See
https://googlecloudplatform.github.io/google-cloud-node/#//docs/guides/authentication
for a detailed guide on creating an authenticated connection.

1. Modify buckets.js to explicitly pass in a project ID
2. Run node buckets.js list
3. It works
4. Undo your changes to buckets.js
5. Set the GCLOUD_PROJECT env var to your project ID
6. Run node buckets.js list
7. It works

Expected

1. Open terminal
2. Run cd nodejs-docs-samples/storage
3. Run gcloud beta auth application-default login
4. Run node buckets.js list (No env vars are set, code does not pass project ID to client)
5. It works