THREE.ArrowHelper class binding for a-frame.
Add following script tag after a-frame script.
<script src="http://unpkg.com/aframe-arrow-component/"></script>
or, to use npm, install first.
npm i aframe-arrow-component
then link index.js directly
<script src="node_modules/aframe-arrow-component/index.js"></script>
or use with favorite bundler.
import "aframe-arrow-component";