JSで画像をまとめて読み込む(プリロードする)

let imagesUrl = [
  "/path/to/image/a.png",
  "/path/to/image/b.png",
  "/path/to/image/c.png",
  // ...
]
let images = new Array(imagesUrl.length)
let loadingCount = 0

const mainEvent = () => {
　　// 画像読み込み完了時の処理を書く
  console.log('complete')
}

for (let i = 0; i < imagesUrl.length; i++) {
  images[i] = new Image()
  images[i].src = imagesUrl[i]
  images[i].crossOrigin = "Anonymous";
  images[i].addEventListener('load', () => {
    loadingCount++
    if (loadingCount === images.length - 1) {
      mainEvent()
    }
  })
}