notifications-admin/app/assets/javascripts/modules/all.mjs

// JS Module used to combine all the JS modules used in the application into a single entry point,
// a bit like `app/__init__` in the Flask app.
//
// When processed by a bundler, this is turned into a Immediately Invoked Function Expression (IIFE)
// The IIFE format allows it to run in browsers that don't support JS Modules.
//
// Exported items will be added to the window.GOVUK namespace.
// For example, `export { Frontend }` will assign `Frontend` to `window.Frontend`
import Header from 'govuk-frontend/components/header/header';

// Copy of the initAll function from https://github.com/alphagov/govuk-frontend/blob/v2.13.0/src/all.js
// except it only includes, and initialises, the components used by this application.
function initAll (options) {
  // Set the options to an empty object by default if no options are passed.
  options = typeof options !== 'undefined' ? options : {}

  // Allow the user to initialise GOV.UK Frontend in only certain sections of the page
  // Defaults to the entire document if nothing is set.
  var scope = typeof options.scope !== 'undefined' ? options.scope : document

  // Find first header module to enhance.
  var $toggleButton = scope.querySelector('[data-module="header"]')
  new Header($toggleButton).init()
}

// Create separate namespace for GOVUK Frontend.
var Frontend = {
  "Header": Header,
  "initAll": initAll
}

export {
  Frontend
}