Can confirm this as well.

I was using [email protected] with Typescript.
I did the following command:

firebase deploy --only functions:group1,functions:group2,functions:group3

After those functions were successfully deployed, Nodejs notified me that a new version of firebase-tools is available.
So I naturally updated firebase-tools to 12.6.0.

Then I ran the following command to continue deploy other functions:

firebase deploy --only functions:group4,functions:group5,functions:group6

But all the functions failed to deploy. And I got the same error as OP.
I ran the following command that were successfully executed in 12.5.3, but they also all failed to deploy in 12.6.0.

firebase deploy --only functions:group1,functions:group2,functions:group3

--

Edit 1:

After I made this comment, I tried [email protected], [email protected], [email protected], but they all still failed to deployed with the same error. Which is weird because I was able to deploy literally the second before I updated firebase-tools to 12.6.0. But now I cannot deploy with any version of firebase-tools.

Edit 2:

It seemed like [email protected] somehow "corrupted" my functions that made them unable to be replaced by redeploy with any version of firebase-tools again.
After manually deleting all the functions from console.cloud.google.com, I am now able to deploy functions again using [email protected].

I also tried to delete all the functions from console.cloud.google.com. and deploy with [email protected]. But it failed and showed the same error as OP.

Hi everyone, thanks for reporting this issue. I was able to replicate the behavior mentioned. I tried deploying the code snippet provided using firebase-tools v12.5.4 and no issues were raised:

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

export const Hello = {
  world: onRequest((req, res) => {
    res.send('Hello World')
  })
}

However, after upgrading to firebase-tools v12.6.0, it raises an error when trying to deploy the same functions from above.

Let me raise this to our engineering team so that they can take a look and investigate the issue.

The last two versions (12.5.0 and 12.6.0) of firebase-tools have had critical bugs in them that should not have made it into a release.

How are the firebase team looking to improve the release and testing process to ensure that these issues don't keep occurring?

2.5.0 issue: #6290

Hey all, fix is coming ASAP for this issue. This also highlighted a gap in our integration tests - we'll be adding coverage for function groups to catch issues like this in the future.

The PR referred to above does not fix the issue. It does a functionId.replace("-", ".") which replaces the first instance of - with . and not all instances. It ought to use replaceAll instead.
@joehan

Thanks for pointing this out @mortenbekditlevsen, functionId.replace("-", ".") was changed to functionId.replaceAll("-", ".") in #6423. This should be rolled out in the next release.