constructor(props, context) {
    super(props, context);
    this.state = {
      drawerType: 'overlay',
      openDrawerOffset:100,
      closedDrawerOffset:0,
      panOpenMask: .1,
      panCloseMask: .9,
      relativeDrag: false,
      panThreshold: .25,
      tweenHandlerOn: false,
      tweenDuration: 350,
      tweenEasing: 'linear',
      disabled: false,
      tweenHandlerPreset: null,
      acceptDoubleTap: false,
      acceptTap: false,
      acceptPan: true,
      tapToClose: false,
      negotiatePan: false,
      side: "top",
    };
  }
rn-drawer example app
https://github.com/facebook/react-native