On github i see this path to a file:
importScripts('/__/firebase/3.8.0/firebase-app.js');
importScripts('/__/firebase/3.8.0/firebase-messaging.js');
importScripts('/__/firebase/init.js');
What does the "/__/" stands for?
On Firebase Hosting, the Firebase SDK along with a script that initializes the SDK for the current project are automatically served from special reserved URLs. You can read more about it on this blog post.
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