@wordpress/interactivity-router/build-module/assets/dynamic-importmap/fetch.js

Package that exposes state and actions from the `core/router` store, part of the Interactivity API.

/**
 * This code is derived from the following projects:
 *
 * 1. dynamic-importmap (https://github.com/keller-mark/dynamic-importmap)
 * 2. es-module-shims (https://github.com/guybedford/es-module-shims)
 *
 * The original implementation was created by Guy Bedford in es-module-shims,
 * then adapted by Mark Keller in dynamic-importmap, and further modified
 * for use in this project.
 *
 * Both projects are licensed under the MIT license.
 *
 * MIT License: https://opensource.org/licenses/MIT
 */

/**
 * Internal dependencies
 */

const fetching = (url, parent) => {
  return ` fetching ${url}${parent ? ` from ${parent}` : ''}`;
};
const jsContentType = /^(text|application)\/(x-)?javascript(;|$)/;

/**
 * Fetches the passed module URL and return the corresponding `ModuleLoad`
 * instance. If the passed URL does not point to a JS file, the function
 * throws and error.
 *
 * @param url       Module URL.
 * @param fetchOpts Fetch init options.
 * @param parent    Parent module URL referencing this URL (if any).
 * @return Promise with a `ModuleLoad` instance.
 */
export async function fetchModule(url, fetchOpts, parent) {
  let res;
  try {
    res = await fetch(url, fetchOpts);
  } catch (e) {
    throw Error(`Network error${fetching(url, parent)}.`);
  }
  if (!res.ok) {
    throw Error(`Error ${res.status}${fetching(url, parent)}.`);
  }
  const contentType = res.headers.get('content-type');
  if (!jsContentType.test(contentType)) {
    throw Error(`Bad Content-Type "${contentType}"${fetching(url, parent)}.`);
  }
  return {
    responseUrl: res.url,
    source: await res.text()
  };
}
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