How to to set Region when deploying Firebase Cloud Functions (2nd gen)

I am setting up a Firebase project with functions organised in separate files. I am trying this out with 2nd gen functions.

Looking at the documentation, it seems like it has not been updated for 2nd gen as the example code functions are 1st gen:
https://firebase.google.com/docs/functions/organize-functions?gen=2nd#write_functions_in_multiple_files

Even so, everything is working fine using this simple setup:

index.ts:

import { initializeApp } from 'firebase-admin/app'
import addAmessage from './api/addAmessage'
import app from './onCall/app'

initializeApp()

exports.addAmessage = addAmessage

exports.app = app

And in the addAmessage.ts file I use the Firebase example function only adding the setGlobalOptions:

api/addAmessage.ts:

import { onRequest } from 'firebase-functions/v2/https'
import { getFirestore } from 'firebase-admin/firestore'
import { setGlobalOptions } from 'firebase-functions/v2'

setGlobalOptions({ region: 'europe-west3' })
// Take the text parameter passed to this HTTP endpoint and insert it into
// Firestore under the path /messages/:documentId/original
const addAmessage = onRequest(async (req, res) => {
  // Grab the text parameter.
  const message = req.query.text

  if (message !== undefined) {
    // Push the new message into Firestore using the Firebase Admin SDK.
    const writeResult = await getFirestore()
      .collection('messages')
      .add({ message })
    // Send back a message that we've successfully written the message
    res.json({ result: `Message with ID: ${ writeResult.id } added.` })
  }
})

export default addAmessage

With just one Function this works fine, but since I set use the setGlobalOptions in my other functions files also I get a warning in the emulator console:

"Calling setGlobalOptions twice leads to undefined behavior"

I originally put the setGlobalOptions method in my index.ts file but then it was ignored.

So, I would love to only have to setGlobalOptions once, but how is it done correctly with multiple files?

I've just run into the same issue and was able to solve it by changing the export, making your code look like:

index.ts

import { initializeApp } from 'firebase-admin/app'
import { setGlobalOptions } from 'firebase-functions/v2'

initializeApp()

setGlobalOptions({ region: 'europe-west3' })

export { addAmessage } from './api/addAmessage'
export { import } app from './onCall/app'

api/addAmessage.ts

import { onRequest } from 'firebase-functions/v2/https'
import { getFirestore } from 'firebase-admin/firestore'

// Take the text parameter passed to this HTTP endpoint and insert it into
// Firestore under the path /messages/:documentId/original
export const addAmessage = onRequest(async (req, res) => {
  // Grab the text parameter.
  const message = req.query.text

  if (message !== undefined) {
    // Push the new message into Firestore using the Firebase Admin SDK.
    const writeResult = await getFirestore()
      .collection('messages')
      .add({ message })
    // Send back a message that we've successfully written the message
    res.json({ result: `Message with ID: ${ writeResult.id } added.` })
  }
})

you can still override the global options or append to them in your function if needed by adding the options to your onRequest.

export const addAmessage = onRequest({ minInstances: 1 }, async (req, res) => {

As to why this is, I do not know and maybe someone can explain it further.

I had a similar issue and incase anyone is still struggling with this, you can pass an options object to the callable function. One of the options is region, which you can set as required.

Here is the code that should work :

import { onRequest } from 'firebase-functions/v2/https'
import { getFirestore } from 'firebase-admin/firestore'

// Take the text parameter passed to this HTTP endpoint and insert it into
// Firestore under the path /messages/:documentId/original
const addAmessage = onRequest({region: 'europe-west3'}, async (req, res) =>
{
    // Grab the text parameter.
    const message = req.query.text

    if (message !== undefined) {
        // Push the new message into Firestore using the Firebase Admin SDK.
        const writeResult = await getFirestore()
            .collection('messages')
            .add({ message })
        // Send back a message that we've successfully written the message
        res.json({ result: `Message with ID: ${ writeResult.id } added.` })
    }
})

export default addAmessage