google-auth-library-nodejs
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fix documentation related to authentication strategy
Related to #1084 and #983
How, and in what order of operations, are we authenticating in this library? We have a document describing how environment variables, constructors, etc., operate together, but what about order of operations within the constructor? For example, where do keyfile, credentials, andclientOptions fit in against the wider order of operations for authentication? When should we be trying to get a projectId?