// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview ensureLazyLoaded() will dynamically add the lazy_load.js
* script to the DOM, which will subsequently load all the Advanced section
* pages and all subpages.
*/
import {getTrustedScriptURL} from 'chrome://resources/js/static_types.js';
const ADVANCED_SECTION_PAGES = [
'settings-crostini-page',
'settings-date-time-page',
'os-settings-files-page',
'os-settings-languages-section',
'os-settings-printing-page',
'os-settings-reset-page',
];
let lazyLoadPromise: Promise<CustomElementConstructor[]>|null = null;
/**
* @return Resolves when the lazy load module is imported and all Advanced
* section pages have been defined. The promise is not blocked by all subpages
* loading, however.
*/
export function ensureLazyLoaded(): Promise<CustomElementConstructor[]> {
if (!lazyLoadPromise) {
const script = document.createElement('script');
script.type = 'module';
script.src = getTrustedScriptURL`./lazy_load.js`;
document.body.appendChild(script);
lazyLoadPromise = Promise.all(
ADVANCED_SECTION_PAGES.map((name) => customElements.whenDefined(name)));
}
return lazyLoadPromise;
}