reveal.js

import SlideContent from './controllers/slidecontent.js'
import SlideNumber from './controllers/slidenumber.js'
import Backgrounds from './controllers/backgrounds.js'
import AutoAnimate from './controllers/autoanimate.js'
import Fragments from './controllers/fragments.js'
import Overview from './controllers/overview.js'
import Keyboard from './controllers/keyboard.js'
import Location from './controllers/location.js'
import Controls from './controllers/controls.js'
import Progress from './controllers/progress.js'
import Pointer from './controllers/pointer.js'
import Plugins from './controllers/plugins.js'
import Print from './controllers/print.js'
import Touch from './controllers/touch.js'
import Focus from './controllers/focus.js'
import Notes from './controllers/notes.js'
import Playback from './components/playback.js'
import defaultConfig from './config.js'
import * as Util from './utils/util.js'
import * as Device from './utils/device.js'
import {
	SLIDES_SELECTOR,
	HORIZONTAL_SLIDES_SELECTOR,
	VERTICAL_SLIDES_SELECTOR,
	POST_MESSAGE_METHOD_BLACKLIST
} from './utils/constants.js'

/**
 * reveal.js
 * https://revealjs.com
 * MIT licensed
 *
 * Copyright (C) 2020 Hakim El Hattab, https://hakim.se
 */
export default function( revealElement, options ) {

	// Support initialization with no args, one arg
	// [options] or two args [revealElement, options]
	if( arguments.length < 2 ) {
		options = arguments[0];
		revealElement = document.querySelector( '.reveal' );
	}

	const Reveal = {};

	// The reveal.js version
	const VERSION = '4.0.0-dev';

	// Configuration defaults, can be overridden at initialization time
	let config,

		// Flags if reveal.js is loaded (has dispatched the 'ready' event)
		ready = false,

		// The horizontal and vertical index of the currently active slide
		indexh,
		indexv,

		// The previous and current slide HTML elements
		previousSlide,
		currentSlide,

		// Remember which directions that the user has navigated towards
		navigationHistory = {
			hasNavigatedHorizontally: false,
			hasNavigatedVertically: false
		},

		// Slides may have a data-state attribute which we pick up and apply
		// as a class to the body. This list contains the combined state of