Getting "test user" alert

Ionic Framework ionic-v3
1

getting “test user” alert. getting random alert like below image on first time app open. does anyone know reason of this?

IMG_20201031_105506
IMG_20201031_1055061064×520 24.8 KB

2

First things first, who wrote or created or developed the app?

3

i have made app in ionic3. but i was getting this type of alert on first time open of an app.
i have fixed this issue by downgrading version of “cordova-plugin-firebasex” from 11.0.3 to 9.1.2-cli. but i could not found reason that why this type of alert coming in latest version of “cordova-plugin-firebasex”!

4

check on initializeApp()
send code initializeApp() here