index.js

import * as scope from './lib/scope.js'
import * as polite from './lib/polite.js'
import * as preloader from './lib/preloader.js'
import * as payloader from './lib/payloader.js'

/*
 * 	NOTE:
 *
 *	This class expects window-scoped methods to exist
 *
 */
// callback to allow control of when polite-load launches
let preloaderComplete
const begin = async () => {
	await polite.prepare(window.adParams.politeLoadAfter)
	// prepare vendor onload (Network.js)
	await window.prepareIndex()
	// prepare scope
	scope.prepare()
	// misc index control
	await window.prepareAdParamsMisc()
	// prepare network
	await window.prepareNetworkExit()

	// prepare preloader
	const preloaders = await preloader.loadPreloaders(window.assets)
	// allow index custom preloader routines to resolve
	preloaderComplete = window.preparePreloader(preloaders) || Promise.resolve()

	// finish polite timeout (some networks require delay before asset load)
	await polite.resolveDelay()

	// load build payloads: fonts, scripts, images, binaries
	const assets = await payloader.loadAssets(window.assets)

	// preload complete
	await preloaderComplete

	// launch polite
	window.onImpression({ ...assets, preloaders })
}
begin()