railsでjsライブラリの`leader-line`を使いたい

import { LeaderLine } from 'exports-loader?exports=LeaderLine!leader-line/leader-line.min.js';

// 本題とは関係ないが、ページが pyramid.js を読み込む時点では
// start と end の要素が存在しないので元のコードではエラーになる。
// ページロード完了時に実行するように変える。
document.addEventListener('DOMContentLoaded', () => {
  new LeaderLine(
  document.getElementById('start'),
  document.getElementById('end'));
});

// This file is automatically compiled by Webpack, along with any other files
// present in this directory. You're encouraged to place your actual application logic in
// a relevant structure within app/javascript and only use these pack files to reference
// that code so it'll be compiled.

require("@rails/ujs").start()
require("turbolinks").start()
require("@rails/activestorage").start()
require("channels")
require("leader-line").default





// Uncomment to copy all static images under ../images to the output folder and reference
// them with the image_pack_tag helper in views (e.g <%= image_pack_tag 'rails.png' %>)
// or the `imagePath` JavaScript helper below.
//
// const images = require.context('../images', true)
// const imagePath = (name) => images(name, true)


import "../stylesheets/application.scss";


import "./pyramid.js";
import "./test";