How to set functions region for React Native Firebase

Question

I have a react native app with react-native-firebase and I'm trying to run a callable https firebase function which is deployed to a custom region.

I've read that firebase.app().functions("MY-REGION") so I tried the following:

import { firebase } from "@react-native-firebase/database"
import functions from "@react-native-firebase/functions"

firebase.app().functions("MY-REGION")

But If I run that I get this error:

Error: You attempted to use 
"firebase.app('[DEFAULT]').functions" but this
module could not be found.

Ensure you have installed and imported the
'@react-native-firebase/functions' package

The functions package is installed.

If I remove the @react-native-firebase/functions import the error stays the same.

How can I specify the region for firebase https functions in react-native-firebase?

More attempts:

firebase.initializeApp({
   ...options
})

firebase.app().functions("MY-REGION")

And that says Error: Firebase App named '[DEFAULT]' already exists

firebase.initializeApp({
   ...options
}, "APP_NAME")

firebase.app("APP_NAME").functions("MY-REGION")

Gives Error: No firebase App 'APP_NAME' has been created - call firebase.initializeApp()

I hope I'm missing something trivial.

Guglie Guglie · Accepted Answer · 2020-06-13T20:31:34

A solution is to change the functions import from import functions from "..." to import "...":

import { firebase } from "@react-native-firebase/database"
import "@react-native-firebase/functions" // <--

// call a https firebase function
firebase.app().functions("MY-REGION").httpsCallable('MyFunction')()

Note that MY-REGION should be set to the region shown in the firebase functions dashboard for the selected httpsCallable function.

The fix I found was indeed quite trivial...
I've shared it here so it can be useful for others, but better solutions are welcome!

How to set functions region for React Native Firebase

More attempts:

1 Answers