How to use the react-native-windows.AppTheme.isHighContrast function in react-native-windows

accessibilityHint="A hint for the blue box."
        />
        
        
    );
  }
}

class HighContrastExample extends React.Component {
  state = {
    isHighContrast: AppTheme.isHighContrast,
    highContrastColorValues: AppTheme.currentHighContrastColors,
    currentTheme: AppTheme.currentTheme,
  };

  componentDidMount() {
    AppTheme.addListener('highContrastChanged', this.onHighContrastChanged);
    AppTheme.addListener('appThemeChanged', this.onAppThemeChanged);
  }

  componenetWillUnmount() {
    AppTheme.removeListener('highContrastChanged', this.onHighContrastChanged);
    AppTheme.removeListener('appThemeChanged', this.onAppThemeChanged);
  }

  // TODO: Make args props
  onHighContrastChanged = (event: IHighContrastChangedEvent) => {