Component.js

# Import the tree component 
import {Tree} from 'untree-react'
  
 class MyComponent extends React.Component { 

      constructor() {
        
        //initialize the Tree
        this.state.tree = {
          name: "Node 1"
          children: [
            {name: "Node 1.1"}
            {name: "Node 1.2"}
            ]
        }
      }
      
      //handle click
      handleClick(node) {
        console.log(node)
      }

      //handle expand
      handleExpandToggle(node) {
        this.setState({tree: this.state.tree.expandToggle(node)})
      }

      //... 
      render() {
        return(
        <Tree 
          tree={this.state.tree} 
          onClick={(node) => handleClick(node)} 
          onExpandToggle ={(node) => handleExpandToggle(node)} />
        )
      }