Firebase emulators:exec errors when running a Jest test script

[REQUIRED] Environment info

firebase-tools: 7.10.0 Node version: v8.16.2 jest version: 24.9.0

Platform: macOS Mojave 10.14.6

[REQUIRED] Test case

You don’t need actual test files to repro this bug - it occurs with or without actual files to test.

// package.json

{
  "name": "firestore-bug-demo",
  "version": "0.0.1",
  "description": "example",
  "scripts": {
    "test": "jest -i"
  },
  "devDependencies": {
    "jest": "^24.9.0"
  }
}

[REQUIRED] Steps to reproduce

Run:

$ firebase emulators:exec --only firestore "npm run test"

[REQUIRED] Expected behavior

I expect that my test suite is run after the Firestore emulator starts up.

[REQUIRED] Actual behavior

It consistently errors out with the following logs:

$ firebase emulators:exec --only firestore "npm run test"

⚠  Could not find config (firebase.json) so using defaults.
i  emulators: Starting emulators: firestore
⚠  No Firestore rules file specified in firebase.json, using default rules.
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
i  Running script: npm run test

> firestore-bug-demo@0.0.1 test /Users/johngcook/Developer/projects/demo/tmp
> jest -i

/usr/local/bin/firebase[55942]: ../src/node_file.cc:1441:void node::fs::RealPath(const FunctionCallbackInfo<v8::Value> &): Assertion `(argc) >= (3)' failed.
 1: 0x100ce8dad node::Abort() (.cold.1) [/usr/local/bin/firebase]
 2: 0x10003abdd node_module_register [/usr/local/bin/firebase]
 3: 0x100039d35 node::AddEnvironmentCleanupHook(v8::Isolate*, void (*)(void*), void*) [/usr/local/bin/firebase]
 4: 0x10006e283 node::fs::RealPath(v8::FunctionCallbackInfo<v8::Value> const&) [/usr/local/bin/firebase]
 5: 0x100215063 v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo*) [/usr/local/bin/firebase]
 6: 0x10021454e v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) [/usr/local/bin/firebase]
 7: 0x100213c1a v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/usr/local/bin/firebase]
 8: 0x3f9fc815be3d
 9: 0x3f9fc81118d5
✔  Script exited successfully (code 0)
i  Shutting down emulators.
i  Stopping firestore emulator

[icfeavoir]

I had the same issue, fixed by using npx firebase emulators:exec instead of firebase emulators:exec and npx jest instead of jest or npm run jest

[the-jackalope]

Strangely this problem was fixed by removing the firebase-cli binary I installed with the auto-install script (curl -sL firebase.tools | bash) and reinstalling firebase-cli with Homebrew.

Based on the error logs there’s clearly some Node issue occurring when trying to run Jest since the error is thrown by the Node runtime. Does firebase-cli use whatever Node version is on a system’s PATH?