constructor.js

constructor(props) {
  super(props);

  const gestureX = new Value(0);
  const state = new Value(-1);

  this._onGestureEvent = event([
    {
      nativeEvent: {
        translationX: gestureX,
        state: state,
      },
    },
  ]);

  this._transX = new Value(0);
}