bqr_auth(json_file = NULL, token = NULL,
  email = Sys.getenv("GARGLE_EMAIL"))

## Not run: 

# to use default package credentials (for testing)
library(bigQueryR)
bqr_auth("location_of_json_file.json")

# or via email
bqr_auth(email="me@work.com")

# to use your own Google Cloud Project credentials
# go to GCP console and download client credentials JSON 
# ideally set this in .Renviron file, not here but just for demonstration
Sys.setenv("GAR_CLIENT_JSON" = "location/of/file.json")
library(bigQueryR)
# should now be able to log in via your own GCP project
bqr_auth()

# reauthentication
# Once you have authenticated, set email to skip the interactive message
bqr_auth(email = "my@email.com")

# or leave unset to bring up menu on which email to auth with
bqr_auth()
# The bigQueryR package is requesting access to your Google account. 
# Select a pre-authorised account or enter '0' to obtain a new token.
# Press Esc/Ctrl + C to abort.
#1: my@email.com
#2: work@mybusiness.com
# you can set authentication for many emails, then switch between them e.g.
bqr_auth(email = "my@email.com")
bqr_list_projects() # lists what GCP projects you have access to
bqr_auth(email = "work@mybusiness.com") 
bqr_list_projects() # lists second set of projects




## End(Not run)