messages

const loader = {
  // The loader matches all the bundle identifiers starting with "my-application/"
  pattern: "my-application/",
  // fetch the JSON file from a `translations` folder
  async fetchMessageBundle(bundleId, locale) {
    const url = new URL(`/assets/translations/${bundleId}_${locale}.json`, window.location.href);
    const response = await fetch(url);
    return response.json();
  }
};

registerMessageBundleLoader(loader);

// Fetch file `./translations/my-application/MyBundle_en-US.json`
const bundle = await fetchMessageBundle("my-application/translations/MyBundle");