@microsoft/mgt/dist/bundle/mgt-loader.js

The Microsoft Graph Toolkit

/**
 * -------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.
 * See License in the project root for license information.
 * -------------------------------------------------------------------------------------------
 */

(function() {
  'use strict';

  var rootPath = getScriptPath();

  // decide es5 or es6
  if (es6()) {
    window.WebComponents = window.WebComponents || {};
    window.WebComponents.root = rootPath + 'wc/';

    addScript(rootPath + 'wc/webcomponents-loader.js');
    addScript(rootPath + 'mgt.es6.js');
  } else {
    // es5 bundle already includes all the polyfills
    addScript(rootPath + 'mgt.es5.js');
  }

  function getScriptPath() {
    var scripts = document.getElementsByTagName('script');
    var path = scripts[scripts.length - 1].src.split('?')[0];
    var dir =
      path
        .split('/')
        .slice(0, -1)
        .join('/') + '/';
    return dir;
  }

  // from https://stackoverflow.com/questions/29046635/javascript-es6-cross-browser-detection
  function es6() {
    'use strict';

    if (typeof Symbol == 'undefined') return false;
    try {
      eval('class Foo {}');
      eval('var bar = (x) => x+1');
    } catch (e) {
      return false;
    }

    return true;
  }

  function addScript(src, onload) {
    // TODO: support async loading

    var tag = document.createElement('script');
    tag.src = src;

    // if (onload) {
    //   tag.addEventListener("load", onload);
    // }

    document.write(tag.outerHTML);
    // document.head.appendChild(tag);
  }
})();