@financial-times/o-fetch-jsonp/browser.js

**o-fetch-jsonp is deprecated. Use the `fetch` [polyfill](http://polyfill.io/) and [Cross-Origin Resource Sharing](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) instead.**

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.jsonpFetch = exports.default = void 0;
var jsonpCallbackNames = [];

var generateCallbackName = () => {
  var base = 'jsonpCallback';
  var callbackName = "".concat(base, "_").concat(jsonpCallbackNames.length + 1);
  jsonpCallbackNames.push(callbackName);
  return callbackName;
};

var crossDomainFetch = 'withCredentials' in new XMLHttpRequest() ? fetch : jsonpFetch;

var jsonpFetch = (url, opts) => {
  var defaultOpts = {
    timeout: 2000
  };
  opts = opts || {};
  Object.keys(defaultOpts).forEach(defaultOptsKey => {
    if (!opts.hasOwnProperty(defaultOptsKey)) {
      opts[defaultOptsKey] = defaultOpts[defaultOptsKey];
    }
  });
  return new Promise((resolve, reject) => {
    var callbackName = generateCallbackName();
    var timeout;
    window.FT = window.FT || {};

    window.FT[callbackName] = response => {
      var status = response.status ? response.status : 200;
      resolve({
        ok: Math.floor(status / 100) === 2,
        status: status,
        json: () => Promise.resolve(response.body || response)
      });

      if (timeout) {
        clearTimeout(timeout);
      }
    };

    var scriptTag = document.createElement('script');
    scriptTag.defer = true;
    scriptTag.src = "".concat(url).concat(url.indexOf('?') > -1 ? '&' : '?', "callback=FT.").concat(callbackName);
    document.body.appendChild(scriptTag);
    timeout = setTimeout(() => {
      reject(new Error("JSONP request to ".concat(url, " timed out")));
    }, opts.timeout);
  });
};

exports.jsonpFetch = jsonpFetch;
var _default = crossDomainFetch;
exports.default = _default;