Running the firestore emulator in a CI environment without IPv6

test-firestore-on-ci.sh

#!/bin/sh

EMULATOR="cloud-firestore-emulator"
EMULATOR_TARGET=$(find ~/.cache/firebase/emulators/ -type f -name "$EMULATOR*.jar" | sort -r | head -n1)

if [ -z "$EMULATOR_TARGET" ]; then
  echo "Could not find the firestore emulator. Ending test run."
  exit 1
fi

# I've found that the java process is not always killed properly,
# causing issues on subsequent runs... so let's clean things up when we're done (or have errored)
killEmulatorPid()
{
  EMULATOR_PID=$(pgrep -f "$EMULATOR")

  if ! [ -z "$EMULATOR_PID" ]; then
    kill -9 "$EMULATOR_PID"
  fi
}

java -jar "$EMULATOR_TARGET" --host=127.0.0.1 --port=8080 > /dev/null 2> firestore-emulator.log &
RETRIES=0
RETRY_LIMIT=10

while [ $RETRIES -lt $RETRY_LIMIT ]; do
  sleep 1
  echo "Pinging firestore emulator"

  if nc -z localhost 8080; then
    break
  fi

  let RETRIES+=1

  if [ $RETRIES -ge $RETRY_LIMIT ]; then
    echo "Could not find the firestore emulator. Ending test run."
    killEmulatorPid
    exit 1
  fi
done

yarn test

echo "End of test run. Cleaning up the firestore emulator."
killEmulatorPid

Thanks, got it working in the end. AFAIK, GitHub doesn't do notifications (or didn't at one point) for comments on Gists.