title: Firebase Deploy: Error: Could not detect language for functions at
body: <p>I'm trying to deploy my firebase project, but Im getting the following error:</p>
  <blockquote>
  <p>=== Deploying to 'my-proj'...</p>
  <p>deploying firestore, functions, hosting</p>
  <p>cloud.firestore: checking firestore.rules for compilation errors...</p>
  <p>[W] undefined:undefined - Ruleset uses old version (version [1]). Please update to the latest version (version [2]).</p>
  <p>cloud.firestore: rules file firestore.rules compiled successfully</p>
  <p>Error: Could not detect language for functions at</p>
  </blockquote>
  <p>any thoughts?</p>