@firebase/firestore: Firestore (7.9.2): FIRESTORE (7.9.2) INTERNAL ASSERTION FAILED: value must be undefined or Uint8Array

[Gurey]

[REQUIRED] Describe your environment

• Operating System version: macOS 10.14.5
• Browser version: N/A
• Firebase SDK version: 8.9.2
• Firebase Product: forestore database

[REQUIRED] Describe the problem

Getting an internal error when i try to save anything in the firestore emulator in typescript project.
I run my tests with jest ^24.9.0

Steps to reproduce:

sample.test.ts

import * as firebase from '@firebase/testing'
const app = firebase.initializeTestApp({
  projectId: 'sample-test',
  databaseName: 'test-db'
})

describe('firebase test', () => {
  test('save something', async () => {
    return app
      .firestore()
      .collection('user')
      .add({ email: 'some@email.com' })
  })
})

run with firebase emulators:exec --only firestore,database "node_modules/.bin/jest --forceExit"

then i get this output:

firebase emulators:exec --only firestore,database "node_modules/.bin/jest --forceExit"
i  emulators: Starting emulators: firestore, database
i  firestore: Serving ALL traffic (including WebChannel) on http://localhost:8080
⚠  firestore: Support for WebChannel on a separate port (8081) is DEPRECATED and will go away soon. Please use port above instead.
i  firestore: Emulator logging to firestore-debug.log
✔  firestore: Emulator started at http://localhost:8080
i  firestore: For testing set FIRESTORE_EMULATOR_HOST=localhost:8080
⚠  Database rules file /Users/some/path/firebase/database.rules.json specified in firebase.json does not exist, starting Database emulator without rules.
i  database: Emulator logging to database-debug.log
✔  database: Emulator started at http://localhost:9000
i  database: For testing set FIREBASE_DATABASE_EMULATOR_HOST=localhost:9000
i  Running script: node_modules/.bin/jest --forceExit
 FAIL  src/modules/__test__/sample.test.ts
  firebase test
    ✕ save something (648ms)

  ● firebase test › save something

    FIRESTORE (7.9.2) INTERNAL ASSERTION FAILED: value must be undefined or Uint8Array

      at fail (node_modules/@firebase/firestore/src/util/assert.ts:39:9)
      at assert (node_modules/@firebase/firestore/src/util/assert.ts:48:5)
      at JsonProtoSerializer.Object.<anonymous>.JsonProtoSerializer.fromBytes (node_modules/@firebase/firestore/src/remote/serializer.ts:290:7)
      at PersistentWriteStream.Object.<anonymous>.PersistentWriteStream.onMessage (node_modules/@firebase/firestore/src/remote/persistent_stream.ts:701:44)
      at node_modules/@firebase/firestore/src/remote/persistent_stream.ts:442:21
      at node_modules/@firebase/firestore/src/remote/persistent_stream.ts:492:18
      at node_modules/@firebase/firestore/src/util/async_queue.ts:285:14

  console.error node_modules/@firebase/logger/dist/index.cjs.js:94
    [2020-03-01T21:21:03.696Z]  @firebase/firestore: Firestore (7.9.2): FIRESTORE (7.9.2) INTERNAL ASSERTION FAILED: value must be undefined or Uint8Array

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        3.173s
Ran all test suites matching /e2e/i.
Force exiting Jest: Have you considered using `--detectOpenHandles` to detect async operations that kept running after all tests finished?
⚠  Script exited unsuccessfully (code 1)
i  Shutting down emulators.
i  Stopping firestore emulator
i  Stopping database emulator

Error: Script "node_modules/.bin/jest e2e --forceExit" exited with code 1

[google-oss-bot]

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

[SamyPesse]

I have the same issue. It seems related to jestjs/jest#4422. I'll try some workarounds and keep you posted.

[SamyPesse]

Using https://www.npmjs.com/package/jest-environment-uint8array fixes the issue.

[Gurey]

Thank you @SamyPesse that solved my issue!

[SamyPesse]

Another solution is to use this jest config: https://jestjs.io/docs/en/configuration#extraglobals-arraystring

  extraGlobals: ['Uint8Array', 'ArrayBuffer']