/TypeScript/Check if a user already exists firebase realtime database react native

Check if a user already exists firebase realtime database react native

const { email, username, password } = this.state;

let rootRef = firebase.database().ref();

rootRef
  .child('users')
  .orderByChild('username')
  .equalTo(username)
  .once('value')
  .then(snapshot => {
    if (snapshot.exists()) {
      let userData = snapshot.val();
      console.log(userData);
      Alert.alert('username is taken');
      return userData;
    } else {
      console.log('not found');
      firebase
        .auth()
        .createUserWithEmailAndPassword(email, password)
        .then(async user => {
          console.log('Data created', user);
        });
    }
});

Source: stackoverflow.com

Similar codes

1 vote155 views3 answers
Typescript range
TypeScript
1 vote265 views2 answers
Replying to tweets api tweepy
TypeScript
0 vote148 views1 answer
Create and use constants in angularjs
TypeScript
0 vote150 views1 answer
Matlab components area
TypeScript
0 vote147 views1 answer
Flutter create widget for each element of list
TypeScript
2 votes140 views1 answer
How long does it take to learn typescript
TypeScript
13 votes139 views5 answers
Useref typescript
TypeScript
0 vote170 views2 answers
Handlebars custom helper
TypeScript
2 votes145 views1 answer
Aws sts assume-role example
TypeScript
1 vote154 views2 answers
Dart clone list
TypeScript