Detect if Firebase connection is lost/regained

Question

Is there a strategy that would work within the current Firebase offering to detect if the server connection is lost and/or regained?

I\'m considering some offline co

Answer 1

The suggested solution didn't work for me, so I decided to check the connection by writing and reading 'health/check' value. This is the code:

const config = {databaseURL: `https://${projectName.trim()}.firebaseio.com/`};
//if app was already initialised delete it
if (firebase.apps.length) {
    await firebase.app().delete();
}
// initialise app
let cloud = firebase.initializeApp(config).database();
// checking connection with the app/database
let connectionRef = cloud.ref('health');
connectionRef.set('check')
    .then(() => {
        return connectionRef.once("value");
    })
    .then(async (snap) => {
        if (snap.val() === 'check') {
            // clear the check input
            await connectionRef.remove();
            // do smth here becasue it works
    }
});