Feature Request: Firebase SDK Auto Config

[cupidchan]

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I would like to propose Firebase SDK AutoConfig as an option when initializing the app: AngularFireModule.initializeAppWithAutoConfig(),

Right now, I have a workaround by adding this 2 lines in package.json so that the build process will pull the config from my Firebase project:

    "build": "npm run getFirebaseConfig && ng build",
    "getFirebaseConfig": "firebase apps:sdkconfig web --json > ./firebaseConfig.json",

Then in my app.module.ts:

import * as firebaseConfig from '../../firebaseConfig.json';
AngularFireModule.initializeApp(firebaseConfig.result.sdkConfig),

It works but it has an extra immediate step to generate the firebaseConfig.json. So, it will be great if AngularFireModule takes care of it.

Reference: https://firebase.google.com/docs/hosting/reserved-urls#sdk_auto-configuration

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