@salesforce/design-system-react/module/utilities/warning/url-exists.js

Salesforce Lightning Design System for React

/* Copyright (c) 2015-present, salesforce.com, inc. All rights reserved */

/* Licensed under BSD 3-Clause - see LICENSE.txt or git.io/sfdc-license */

/* eslint-disable import/no-mutable-exports */

/* global XMLHttpRequest, window */
// This function does an "AJAX" request to warn users on how to setup their icon path.
import warning from 'warning';

var urlExists = function urlExistsFunction() {};

if (process.env.NODE_ENV !== 'production') {
  var hasWarned = {};
  var hasExecuted;

  var warn = function warn(control, url, comment) {
    return function (res) {
      hasExecuted = true;

      if (res.status === 404) {
        var additionalComment = comment ? " ".concat(comment) : '';
        /* eslint-disable max-len */

        warning(!url, "The icon asset was not found at ".concat(url, ". Make sure the path to the icon asset is correct. You can set the icon path by importing the IconSettings component, `<IconSettings iconPath=[/assets/icons]>` from `components/iconSettings`, and wrap that component around your entire app or around individual components using icons. If you are using the `<Icon>` component, you can also pass the url to `this.props.path`.").concat(additionalComment));
        /* eslint-enable max-len */

        hasWarned["".concat(control, "-path")] = !!url;
      }
    };
  };

  var shouldWarn = function shouldWarn(control) {
    return !hasExecuted && !hasWarned["".concat(control, "-path")] && typeof window !== 'undefined' && process.env.NODE_ENV !== 'test';
  };

  if (typeof fetch === 'function') {
    urlExists = function urlExistsFunction(control, url, comment) {
      if (shouldWarn(control)) {
        fetch(url).then(warn(control, url, comment));
      }
    };
  } else {
    // Using XMLHttpRequest can cause problems in non-browser environments. This should be completely removed in production environment and should not execute in a testing environment.
    urlExists = function urlExistsFunction(control, url, comment) {
      if (shouldWarn(control) && XMLHttpRequest) {
        var http = new XMLHttpRequest();
        http.open('GET', url, false);
        http.send();
        warn(control, url, comment)(http);
      }
    };
  }
}

export default urlExists;
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