Allow environment variables to override the default emulator addresses (#1312)
Allow environment variables to override the default emulator addresses (#1312)

* Allow environment variables to override the default emulator addresses

* [AUTOMATED]: Prettier Code Styling

* Add type signatures

jsayol/firebase-js-sdk,jsayol/firebase-js-sdk,jsayol/firebase-js-sdk,jsayol/firebase-js-sdk,jsayol/firebase-js-sdk