setupFirebase.ts

import * as path from 'path';
import { execSync } from 'child_process';
import * as admin from 'firebase-admin';

import devConfig from '../configs/dev.json';
import prodConfig from '../configs/prod.json';
import stagingConfig from '../configs/staging.json';

const firebaseBin = path.resolve(__dirname, '../../node_modules/.bin/firebase');

type Env = 'dev' | 'staging' | 'prod';

const projectsMap: { [key: string]: Env } = {
  'mercy-dev': 'dev',
  'mercy-staging': 'staging',
  'mercy-prod': 'prod'
};

const storageURL = (env: Env) => {
  switch (env) {
    case 'staging':
      return 'gs://mercy-staging.appspot.com';
    case 'dev':
      return 'gs://mercy-dev.appspot.com';
    case 'prod':
      return 'gs://mercy-prod.appspot.com';
  }
};

const configFor = (env: Env): any => {
  switch (env) {
    case 'dev':
      return devConfig;
    case 'prod':
      return prodConfig;
    case 'staging':
      return stagingConfig;
  }
};

export const currentEnv = (): Env => {
  return (
    (process.env.DEPOLY_TO as Env) ||
    projectsMap[execSync(`${firebaseBin} use`, { encoding: 'utf8' }).trim()]
  );
};

export const setupFirebase = () => {
  const env = currentEnv();
  console.log(`Current Env: \n- \x1b[1m${env}\x1b[0m`);
  admin.initializeApp({
    credential: admin.credential.cert(configFor(env)),
    storageBucket: storageURL(env)
  });
  admin.firestore().settings({ timestampsInSnapshots: true });
};