"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.createScriptTag = createScriptTag;
exports.default = void 0;

/**
 * @description scoped default argument
 */
const defaultAttributes = {
  async: true
};

function shouldIgnore(src) {
  // no need for this in test env
  // @todo we may want to render a local import though, using a mock/
  if (process.env.NODE_ENV === 'test') {
    return true;
  }

  if (typeof window !== 'object') {
    return true;
  } // all scripts


  const scriptElements = window.document.getElementsByTagName('script');

  for (let index = 0; index < scriptElements.length; index++) {
    const script = scriptElements[index]; // ignore it if we already loaded

    if (script.src === src) {
      // console.warn('already loaded: ', src)
      return true;
    }
  }

  return false;
}
/**
 * @tutorial https://hacks.mozilla.org/2009/06/defer/
 *
 * @param {String} src url of the script tag
 * @param {*} attributes
 * @return {void}
 * @modifies window.dom -> createElement -> <script src>
 */


function createScriptTag(src, attributes = defaultAttributes) {
  if (shouldIgnore(src) === true) {
    return;
  }

  const scriptElements = window.document.getElementsByTagName('script'); // find first script

  const ref = scriptElements[0]; // make our own new script

  const script = window.document.createElement('script'); // set attributes

  script.src = src; // can also object async, or enable a fn to tap this

  script.async = attributes.async; // put before first script

  ref.parentNode.insertBefore(script, ref);
}

var _default = createScriptTag;
exports.default = _default;