React Native - card animation panresponder

this.mainPanResponder = PanResponder.create({
            onStartShouldSetPanResponder: () => true,
            onMoveShouldSetPanResponder: () => true,
            onPanResponderMove: Animated.event([
                null, { dx: this.mainPosition.x, dy: this.mainPosition.y }
            ]),
            onPanResponderGrant: (event, gesture) => {
                this.mainPosition.setOffset({
                    x: this.mainPosition.x._value,
                    y: this.mainPosition.y._value
                });
                this.mainPosition.setValue({ x: 0, y: 0 });
            },
            onPanResponderRelease: (e, gesture) => {
                this.mainPosition.flattenOffset();
                if (gesture.dy < -150) {
                    const y = gesture.dy + this.panelY + this.scrollY;
                    this.addCard(y)
                }
                this.mainPosition.setValue({ x: 0, y: 0 });
            }
        });