Utilize the Firebase SDK served from Reserved URLs when using Firebase Hosting

[wongmjane]

Who will use the feature?

The web apps that are hosted on Firebase Hosting.

When will they use the feature?

Developers might want to utilize the Firebase SDK that are already provided from the Reserved URL.

What is the user’s goal?

To deduplicate the SDK files in order to reduce the size of files being pushed to Firebase Hosting. The files are already there for Firebase Hosting users (from the Reserved URL), it is not necessary to fetch the library again through Bower.

Suggestion

• Make the firebase Bower dependency optional
• Let us load the SDKs (in firebase-*-script.html) from the Reserved URL instead of that firebase bower dependency

[tjmonsi]

We can have this by having firebase-bower-scripts.html, firebase-cdn-scripts.html, and firebase-url-scripts.html

Would that be ok?