Firebase-js-sdk: issue auto import undefined from firebase/empty-import

[hvonralvert]

Installed latest firebase in our app (Angular 2+) to complement our backend.

VScode now auto imports "undefined" from:
import undefined = require('firebase/empty-import');

This just gives a bad developer experience.
We have a pending stack overflow question to just blacklist a single file as we havent needed to do this before. Please just remove this and dont export things like "undefined".

Thanks!

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[rommelpe]

Related to #2203

[rommelpe]

The fix has been merged in #2379. I'd recommend checking out our release notes to see when a PR makes it into an official Release. Any new features/breaking changes/bug fixes should be detailed there. Thanks :)