JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdn.rawgit.com/mrdoob/three.js/master/build/three.js"></script>
<script src="//cdn.rawgit.com/mrdoob/three.js/master/examples/js/controls/OrbitControls.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

let camera, scene, renderer, raycaster, mesh, mouse;

init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.01, 10 );
    camera.position.set( 1, 1, 1 );

    scene = new THREE.Scene();

    const geometry = new THREE.BoxGeometry( 0.5, 0.5, 0.5 );
    const material = new THREE.MeshNormalMaterial();

    mesh = new THREE.Mesh( geometry, material );
    scene.add( mesh );

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );
    
    const controls = new THREE.OrbitControls( camera, renderer.domElement );
    
    document.addEventListener( 'mousedown', onMouseDown, false );
    
    window.addEventListener( 'resize', onWindowResize, false );
    
    //
    
    raycaster = new THREE.Raycaster();
    mouse = new THREE.Vector2();

}

function animate() {

    requestAnimationFrame( animate );
    renderer.render( scene, camera );

}

function onMouseDown( event ) {

  event.preventDefault();
  mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
  mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
  
  raycaster.setFromCamera( mouse, camera );
 
  var intersects = raycaster.intersectObjects( scene.children );
  
  if ( intersects.length > 0 ) {
  
  	console.log( intersects[ 0 ].object ); // print first object
  
  }
  
}

function onWindowResize() {

	camera.aspect = window.innerWidth / window.innerHeight;
	camera.updateProjectionMatrix();
	renderer.setSize( window.innerWidth, window.innerHeight );
  
}