Firebase Emulator error when writing/updating document inside a Firestore trigger, when using snapshot.ref.set()

[REQUIRED] Environment info

firebase-tools: 7.4.0

Platform: Windows

[REQUIRED] Test case

Since auth is not available in the context for Firestore triggers, I send along some user data in the snapshot to log the activity and use the user token to create some extra steps inside the onCreate function. I extract the userdata from the snapshot and the want to remove the userdata using the snapshot.ref.set(snapShotWithoutUserData)

[REQUIRED] Steps to reproduce

export const onOrganizerCreate = functions.firestore.document("organizers/{organizerId}")
.onCreate((snapshot, context) => {
  return snapshot.ref.set({
    test: "testing"
  }, { merge: true });
})

I have tried ref.set(), ref.update() with or without the merge parameter, same result

[REQUIRED] Expected behavior

Expect it to run without errors as it does when i deploy it.

[REQUIRED] Actual behavior

The emulator/trigger crashes, giving this error

If i deploy the same code and run it without the emulator, it works just fine. Or if i use the firebase-admin to do the same task by building the path using the context params, it also works

! Non-default “firebase-admin” instance created!

• This instance will not be mocked and will access production resources. ! Google API requested!
• URL: “https://oauth2.googleapis.com/token”
• Be careful, this may be a production service. ! functions: Error: Getting metadata from plugin failed with error: invalid_grant at Http2CallStream.call.on (C:\Development<projectId>\functions\node_modules@grpc\grpc-js\build\src\client.js:96:45) at Http2CallStream.emit (events.js:194:15) at Http2CallStream.EventEmitter.emit (domain.js:441:20) at process.nextTick (C:\Development<projectId>\functions\node_modules@grpc\grpc-js\build\src\call-stream.js:71:22) at process._tickCallback (internal/process/next_tick.js:61:11) ! Your function was killed because it raised an unhandled error. (node:13324) UnhandledPromiseRejectionWarning: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client at ServerResponse.setHeader (_http_outgoing.js:470:11) at ServerResponse.header (C:\Users\ralcar\AppData\Roaming\npm\node_modules\firebase-tools\node_modules\express\lib\response.js:771:10) at ServerResponse.send (C:\Users\ralcar\AppData\Roaming\npm\node_modules\firebase-tools\node_modules\expressginated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)

[samtstern]

@ralcar thanks!

FYI initializeApp(config().firebase) is outdated, you should just use initializeApp() … that doesn’t change the bug here but it’s worth noting.

[samtstern]

The fix for this issue has been released in version 7.6.0