vuejs/node_modules/@vue/cli-service/lib/commands/build/setPublicPath.js

// This file is imported into lib/wc client bundles.

if (typeof window !== 'undefined') {
  if (process.env.NEED_CURRENTSCRIPT_POLYFILL) {
    require('current-script-polyfill')
  }

  var i
  if ((i = window.document.currentScript) && (i = i.src.match(/(.+\/)[^/]+\.js(\?.*)?$/))) {
    __webpack_public_path__ = i[1] // eslint-disable-line
  }
}

// Indicate to webpack that this file can be concatenated
export default null