Typescript typings

If you start using Firebase in your Typescript application you need to let Typescript know about this global firebase variable that you know have access to. First install firebase not to import but simply to get access to the types contained within:

npm i -D firebase

Now create a src/firebase.d.ts file and copy the following:

import firebase from 'firebase'

declare global {
  export const firebase = firebase
}

Now you have full typescripts bindings available.