google-proto-files 
Get a copy of the googleapis proto files into your project
$ npm install --save google-proto-files
var protoFiles = require('google-proto-files')
Get a directory path by executing as a function
protoFiles('logging', 'v2')
Get a path to the entry proto file for a specific API version
protoFiles.pubsub.v1
Load a proto which depends on google common protos.
Asynchronously
protoFiles.load('path/to/file.proto').then(function(root) {
var MyService = root.lookup('example.MyService')
})
Synchronously
var root = protoFiles.loadSync('path/to/file.proto');
var MyService = root.lookup('example.MyService');