I'm working with this simple codebase
import { FirebaseApp, FirebaseOptions } from "firebase/app";
function example(app){
// error: FirebaseApp only refers to a type
console.log(app instanceof FirebaseApp)
}
In this scenario, the FirebaseApp is actually a typescript interface that does not exist during runtime. How can I verify if the argument provided is truly an instance of firebase app?
FirebaseApp serves as an interface rather than a class. The actual instance of the class FirebaseAppImpl (which implements FirebaseApp) is what cannot be directly imported from firebase/app. If you simply need to pass around the Firebase App instance, utilize the getApp() function instead:
import { getApp } from "firebase/app";
const firebaseApp = getApp(); // retrieve default Firebase app instance
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