firebase-functions

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[REQUIRED] Version info

node: 16.5

firebase-functions: 3.14.1

firebase-tools: 9.16.0

firebase-admin: 9.11.0

[REQUIRED] Test case

The issue/question is generic in nature, but steps to reproduce are added below. In addition, logs are available in this discussion.

I noticed yesterday that the functions/index.js gets imported three times at the launch of Firebase Emulators, and thought this strange.

Having checked the Getting Started section, I found no mention about this. Not sure if it is a feature of the Firebase Emulators or the Cloud Functions implementation, in general.

Why this matters?

People do initialisation in the module body. If such things are time-taking, it is good to know that the body is called 1 + (number of functions in it) times, at initialisation. If this is intended, I think it should be mentioned in the docs.

The sample code shows initialising admin.initializeApp(); in the module body.

When moving to ES modules, this becomes even more important. EcmaScript modules are intended to be imported only once, and cached, so authors naturally expect such behaviour. I am not asking for change of implementation. I am asking for clarifying these things in the documentation.

[REQUIRED] Steps to reproduce

$ git clone https://github.com/akauppi/GroundLevel-firebase-es.git
$ cd GroundLevel-firebase-es
$ git checkout next
$ npm install
...
$ cd packages/backend
# Edit 'functions/index.js', adding a logging for "__LOADED__" or similar.
$ npm run start

[REQUIRED] Expected behavior

The functions/index.js gets loaded once.

[REQUIRED] Actual behavior

The functions/index.js gets loaded 3 times.

• first, before the green lines about functions having loaded are shown
• once for each function included in it

Were you able to successfully deploy your functions?

Yes.

I haven't observed what the behaviour in the cloud is.

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.