jest-firestore/lib/setup.js

Run your tests using Jest & Firestore Emulator

"use strict";

var _helpers = require("./helpers");
var _emulator = require("./emulator");
const debug = require('debug')('jest-firestore:setup');
module.exports = async config => {
  const options = (0, _helpers.getFirestoreEmulatorOptions)(config.rootDir);
  const _shouldUseSharedDBForAllJestWorkers = (0, _helpers.shouldUseSharedDBForAllJestWorkers)(config.rootDir);
  debug(`shouldUseSharedDBForAllJestWorkers: ${_shouldUseSharedDBForAllJestWorkers}`);

  // this one is controversial, might override what user really wants, let's see
  process.env.GCLOUD_PROJECT = options.project_id;

  // if we have FIRESTORE_EMULATOR_HOST already passed from env, bypass starting emulator
  if (process.env.FIRESTORE_EMULATOR_HOST) {
    debug(`FIRESTORE_EMULATOR_HOST is set to ${process.env.FIRESTORE_EMULATOR_HOST}, bypassing emulator start`);
    return;
  }

  // if we run one emulator instance for all tests
  if (_shouldUseSharedDBForAllJestWorkers) {
    debug(`Starting Firestore Emulator`);
    process.env['FIRESTORE_EMULATOR_HOST'] = await (0, _emulator.startEmulator)(options);
    global.__isEmulatorStarted = true;
  }
};