How to tell if cloud functions are running in the emulator and not deployed?

[Jonathon Broughton]

What environment setting, configuration variable or otherwise can I use to conditionally test if I am running a CF locally in emulator or deployed to firebase cloud?

TIA

[Doug Stevenson]

Jonathon,

If I invoke an HTTP trigger with the statement "console.log(process.env)", I get this in the log:

{ WORKER_PORT: '8091',

  GCLOUD_PROJECT: 'the-id-of-my-project',

  FUNCTION_NAME: 'api',

  SUPERVISOR_HOSTNAME: '192.168.1.1',

  PATH: '/usr/local/bin:/usr/bin:/bin',

  PWD: '/user_code',

  FUNCTION_TRIGGER_TYPE: 'HTTP_TRIGGER',

  NODE_ENV: 'production',

  SHLVL: '1',

  CODE_LOCATION: '/user_code',

  FUNCTION_MEMORY_MB: '256',

  GCP_PROJECT: 'the-id-of-my-project',

  PORT: '8080',

  SUPERVISOR_INTERNAL_PORT: '8081',

  ENTRY_POINT: 'api',

  OLDPWD: '/var/tmp/worker/',

  _: '/usr/bin/env',

  HOME: '/tmp' }

I don't know which one is the most appropriate, but I'd go with process.env.GCLOUD_PROJECT or process.env.GCP_PROJECT to see where it's running.  Neither of those are probably in your shell environment.  Alternately, you can put something special in your shell env and check for it in process.env.

Doug

[Vlad O]

Another option is to setup Environment configuration as described here https://firebase.google.com/docs/functions/config-env

[Sam Stern]

Hi Vlad,

This sounds like a good feature request for the emulator.  We could set something like "process.env.FIREBASE_EMULATOR" to "true".  Would that work for your use case?  If so please file a feature request on the firebase-tools repository!

- Sam

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