/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

0 vote163 views1 answer
An unhandled exception occurred: Schematic "Module" not found in collection "@schematics/angular".
TypeScript
0 vote154 views10 answers
Javascript to typescript converter online
TypeScript
1 vote134 views1 answer
Selenium get all child elements python
TypeScript
1 vote146 views1 answer
Can't bind to 'cdkCopyToClipboard' since it isn't a known property of 'button'
TypeScript
1 vote146 views1 answer
NASDAQ: TSLA
TypeScript
1 vote181 views1 answer
Duplicate names in sql
TypeScript
3 votes139 views2 answers
Sort array by date typescript
TypeScript
21 votes167 views6 answers
Ngclass angular
TypeScript
1 vote143 views1 answer
Typescript check if string is number
TypeScript
0 vote150 views3 answers
How to compare two lists element by element in python and return matched element
TypeScript