title: Can GCF node be invoked with flags
body: <p>I would like to try to use --experimental-modules flag in an attempt to streamline builds and bypass babel.</p>
  
  <p>I've gone through the gcloud docs (<a href="https://cloud.google.com/sdk/gcloud/reference/functions/deploy" rel="nofollow noreferrer">https://cloud.google.com/sdk/gcloud/reference/functions/deploy</a>) and see some mention of starting functions with flags but these flags appear to be gcloud flags not flags passed to the node process</p>
  
  <p>I would expect to be able to do something similar to piped args:
  <code>gcloud functions deploy --runtime=nodejs10 -- --experimental-modules</code></p>
  
  <p>but I guess sensibly gcloud do not pass any old args along to the node process... so is there a way of starting node with this specific flag?</p>