Get a copy of the googleapis proto files into your project
$ npm install --save google-proto-files
var protoFiles = require('google-proto-files')
protoFiles('logging', 'v2')
// node_modules/google-proto-files/google/logging/v2
protoFiles.pubsub.v1
// node_modules/google-proto-files/google/pubsub/v1/pubsub.proto