How to use the react-native-openalpr.constants function in react-native-openalpr

render() {
    return (

{
            this.camera = cam;
          }}
          style={styles.preview}
          aspect={this.state.camera.aspect}
          captureQuality={Camera.constants.CaptureQuality.medium}
          country="us"
          onPlateRecognized={this.onPlateRecognized}
          plateOutlineColor="#ff0000"
          showPlateOutline
          torchMode={Camera.constants.TorchMode.off}
          touchToFocus
        />
        
        
        
      

    );
  }
}

constructor(props) {
    super(props);

    this.camera = null;

    this.state = {
      camera: {
        aspect: Camera.constants.Aspect.fill,
      },
      plate: 'Scan a plate',
    };
  }