How to use firebase request like Promises ? (Javascript)

Question

All is in the question.

Answer 1

firebase.auth().signInWithEmailAndPassword(email, password).then(function(user) {
// user signed in
}).catch(function(error) {
var errorCode = error.code;
var errorMessage = error.message;

if (errorCode === 'auth/wrong-password') {
alert('Wrong password.');
} else {
alert(errorMessage);
}
console.log(error);
});
Basically this is promise which is handled in catch easily.

Answer 2

Kunal Thakur thanks