A light yet flexible util to load ES6 modules globally in Windows93

load.js

(() => {
  const { $file: file } = window

  const openAsync = (path, type) =>
    new Promise((resolve, reject) => {
      try {
        const callback = (...args) =>
          resolve(args)

        file.open(path, type, callback)
      } catch {
        const error = new Error('No such file.')

        reject(error)
      }
    })

  /**
   * Loads an ES6 module asynchronously
   * @param {String} location The path or url to the module
   * @returns {Promise<HTMLScriptElement>} The module's <script> tag
   */
  const load = async location => {
    let url = location

    if(location.startsWith('/a/'))
      [ url ] = await openAsync(location, 'URL')

    const script = document.createElement('script')

    script.type = "module"
    script.src = url
    
    let promise = new Promise(resolve => {
      script.onload = resolve
    })

    document.body.appendChild(script)

    await promise

    return script
  }

  if(window)
    Object.assign(window, {
      /**
       * The global alias for the load function when loaded in the browser.
       * @namespace $load
       */
      $load: load
    })
  else
    module.exports = load
})()