vidage/src/scripts/helpers/validate-selector.js

Set video as the background of your website. Fallbacks to the image, when required.

export default function (selector, moduleName) {
  if (typeof selector === 'undefined') {
    throw new Error(`${moduleName} requires a video selector as first argument.`)
  }

  selector = typeof selector === 'string'
    ? document.querySelector(selector)
    : selector

  if (selector.nodeName.toLowerCase() !== 'video') {
    throw new Error(`${moduleName} requires a valid video selector. You passed a <${selector.nodeName}>`)
  }

  return selector
}