@seznam/szn-select/embeddableLoader.js

Accessible HTML selectbox with customizable UI. Based on web components and easy to integrate with various frameworks like React or Angular.

'use strict';

var makeSznSelectBundleScript = function (global) {
  // eslint-disable-line no-unused-vars
  var BUNDLES = {
    ELEMENT_ES2016: 'es2016',
    ELEMENT_ES3: 'es3',
    ELEMENTS_ES2016: 'bundle-elements.es2016',
    ELEMENTS_ES3: 'bundle-elements.es3',
    ALL_CE: 'bundle-full.ce',
    ALL_ES2016: 'bundle-full.es2016',
    ALL_ES3: 'bundle-full.es3'
  };
  var DEFAULT_PACKAGE_URL = 'https://cdn.jsdelivr.net/npm/@seznam/szn-select@1.x/';

  function makeBundleLoadScript(urlsConfiguration, useAsyncLoading) {
    if (typeof self === 'undefined') {
      throw new Error('The loader can only be used at the client-side');
    }

    if (global.SznElements && global.SznElements['szn-tethered'] && global.SznElements['szn-select']) {
      return null; // already loaded
    }

    var bundleUrl = getSznSelectBundleUrl(urlsConfiguration);
    var script = document.createElement('script');
    script.async = useAsyncLoading;
    script.defer = useAsyncLoading;
    script.src = bundleUrl;
    return script;
  }

  function getSznSelectBundleUrl(urlsConfiguration) {
    // Firefox 52-based browsers (e.g. Palemoon) have faulty support for for-scoped const variable declarations
    var firefoxVersionMatch = navigator.userAgent.match(/ Firefox\/(\d+)/);
    var firefoxVersion = firefoxVersionMatch && parseInt(firefoxVersionMatch[1], 10);
    var supportsForConst = !firefoxVersion || firefoxVersion > 52;
    var es2016Supported = supportsForConst && global.Proxy && Array.prototype.includes;
    var runtimeLoaded = global.SznElements && global.SznElements.init && global.SznElements.injectStyles;
    var dependenciesLoaded = runtimeLoaded && global.SznElements['szn-tethered'];
    var bundleToLoad = dependenciesLoaded ? es2016Supported ? BUNDLES.ELEMENT_ES2016 : BUNDLES.ELEMENT_ES3 : runtimeLoaded ? es2016Supported ? BUNDLES.ELEMENTS_ES2016 : BUNDLES.ELEMENTS_ES3 : global.customElements ? BUNDLES.ALL_CE : es2016Supported ? BUNDLES.ALL_ES2016 : BUNDLES.ALL_ES3;
    return urlsConfiguration[bundleToLoad] || function () {
      var baseUrl = urlsConfiguration["package"] || DEFAULT_PACKAGE_URL;
      return /\/$/.test(baseUrl) ? baseUrl : "".concat(baseUrl, "/");
    }() + "szn-select.".concat(bundleToLoad, ".min.js");
  }

  return makeBundleLoadScript;
}(self);