How to call a function from another JS file in React Native?

So I have Drawer.Js using a react-native-off-canvas menu where the only purpose is to open and close the drawer. The problem is that this drawer will only open and close with a gesture (slide left / right). I want to bind this open and close function with a button. The problem is it shows an error when I try to call the handleClick function from Home.Js to my Drawer.Js

Inside my Drawer.Js

class FirstScreen extends Component {

constructor(props) {
super(props);
this.state = {
  menuOpen: false
};
this.handleClick = this.handleMenu.bind(this);
}

handleMenu() {
 const { menuOpen } = this.state;
 this.setState({
  menuOpen: !menuOpen
  });
  }
  // Some Render Method Where i tried to create a button, and calling 
     this.handleMenu() on the onPress event, and it successful

  *//After the Render Method

   export function a() {
    return this.handleClick();
    }

      

        
        
        
      

    

I am also using react native router thread which my apps first route will be in Home.js where in Home.js I am going to put a button to start the drawer to open.

Here's my code for Home.js * // Some imports

   import { a } from './Drawer';

 class Home extends Component {

    constructor(props) {
     super(props);
      this.handleKlik = this.handleKlik.bind(this);
     }

     handleKlik() {
        a();
      }

     *// Render Method Start
      <View>
         <TouchableOpacity onPress={() => this.handleKlik()}>
            <View style={styles.btnContainer}>
             <Text style={styles.btnText}>{'Toggle'.toUpperCase()}
             </Text>
           </View>
         </TouchableOpacity>
      <View>

      

        
        
        
      

    

Well here in Home.js when I tried to click on the button I got and an error like 'undefined is not a function (evaluting' this.handleClick ')'.

Well I guess I know the problem where my export function is probably the problem. Anyone have any idea how I can fix this? i read the tutorial and i can't figure out why it is so hard to call a function inside other Js files in my project