Cómo registrar a los usuarios sin iniciar sesión en Firebase JS
let authWorkerApp = firebase.initializeApp(firebase.app().options, 'auth-worker');
let authWorkerAuth = firebase.auth(authWorkerApp);
authWorkerAuth.setPersistence(firebase.auth.Auth.Persistence.NONE); // disables caching of account credentials
authWorkerAuth.createUserWithEmailAndPassword(email, password).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// ...
});
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