Fetch firebase remote config - a script for npm build

.fetchRemoteConf.js

require('dotenv').config()
const admin = require("firebase-admin");
admin.initializeApp({
  credential: admin.credential.cert(
    process.env.NODE_ENV === 'production'
      ? require('./gcp.json')
      : JSON.parse(process.env.FIREBASE_ADMIN_SDK)
  ),
  databaseURL: process.env.FIREBASE_DATABASE_URL
});

admin.remoteConfig().getTemplate()
  .then(content =>
    require('fs').writeFile('remoteConfig.json', JSON.stringify(content.parameterGroups), 'utf8',
      (err) => err
        ? console.error(`failed to write remote conf: ${err}`)
        : process.exit()

    ))
  .catch(err => console.error(`failed fetching remote conf: ${err}`))