How to use expo-local-authentication - 6 common examples

private async updateState() {
    this.setState({
      hasHardware: await LocalAuthentication.hasHardwareAsync()
    });
  }
}

async checkDevicePossibilities() {
    const hasHardware = await LocalAuthentication.hasHardwareAsync();
    const isEnrolled = await LocalAuthentication.isEnrolledAsync();

    this.setState({ hasHardware, isEnrolled });
  }

async checkDevicePossibilities() {
    const hasHardware = await LocalAuthentication.hasHardwareAsync();
    const isEnrolled = await LocalAuthentication.isEnrolledAsync();

    this.setState({ hasHardware, isEnrolled });
  }

.map(type => {
        switch (type) {
          case LocalAuthentication.AuthenticationType.FINGERPRINT:
            return 'FINGERPRINT';
          case LocalAuthentication.AuthenticationType.FACIAL_RECOGNITION:
            return 'FACIAL_RECOGNITION';
          default:
            throw new Error(`Unrecognised authentication type returned: '${type}'`);
        }
      })
      .join(', ');

private async authenticate() {
    const authenticated = await LocalAuthentication.authenticateAsync({
      promptMessage: "Authentication message"
    });

    if (authenticated.success) {
      this.setState({
        authenticationError: "None"
      });
    } else {
      this.setState({
        authenticationError: authenticated.error
      });
    }

    this.setState({
      authenticated: authenticated.success
    });

checkAuthenticationsTypes = async () => {
    const result = await LocalAuthentication.supportedAuthenticationTypesAsync();
    const stringResult = result
      .map(type => {
        switch (type) {
          case LocalAuthentication.AuthenticationType.FINGERPRINT:
            return 'FINGERPRINT';
          case LocalAuthentication.AuthenticationType.FACIAL_RECOGNITION:
            return 'FACIAL_RECOGNITION';
          default:
            throw new Error(`Unrecognised authentication type returned: '${type}'`);
        }
      })
      .join(', ');
    alert(stringResult ? `Available types: ${stringResult}` : 'No available authentication types!');
  };