const legacyLoaderString =
	legacyLoader.toString()
	            .replace(/const |let /g, 'var ')
	            .replace(/\(\) =>/g, 'function ()')
	            .split(/\s*\n\s*/g)
	            .filter((line) => {
		            return !/^\/\//.test(line)
	            })
	            .join('')
	+ 'legacyLoader(window, document);';

function legacyLoader(window: any, document: any) {
	const log_fn = console? console.log.bind(console) : () => {
	};
	
	if (!window.hasOwnProperty('console')) {
		log_fn('shim console object');
		if (!window.hasOwnProperty('console')) {
			window['cons' + 'ole'] = {};
		}
		
		// @formatter:off
		const consoleMethod = ['assert','clear','count','debug','dir','dirxml','error','group','groupCollapsed','groupEnd','info','markTimeline','memory','profile','profileEnd','table','time','timeEnd','timeStamp','timeline','timelineEnd','trace','warn',];
		// @formatter:on
		if (!console.log) {
			console.log = () => {
			};
		}
		for (let i = 0; i < consoleMethod.length; i++) {
			if (!console[consoleMethod[i]]) {
				console[consoleMethod[i]] = log_fn;
			}
		}
	}
	
	try {
		new CustomEvent('bla-bla', {bubbles: true, detail: {a: 1}});
	} catch (e) {
		(() => {
			if (typeof window.CustomEvent === "function") {
				return false;
			}
			
			function CustomEvent(event, params) {
				params = params || {bubbles: false, cancelable: false, detail: undefined};
				const evt = document.createEvent('CustomEvent');
				evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
				return evt;
			}
			
			CustomEvent.prototype = window.Event.prototype;
			
			window.CustomEvent = CustomEvent;
		})();
	}
	
	if (navigator.appName == 'Microsoft Internet Explorer' || !!navigator.userAgent.match(/Trident/)) {
		document.write('<script src="https://cdn.jsdelivr.net/core-js/2.4.1/shim.min.js"></scr' + 'ipt>');
	}
	if (!window.fetch) {
		document.write('<script src="https://cdn.jsdelivr.net/fetch/2.0.1/fetch.min.js"></scr' + 'ipt>');
	}
}

const polyfillTooOld = `<!--[if IE]><script type="text/javascript">alert('浏览器版本过低，请升级或使用其他浏览器。');</script><![endif]-->`;

export let polyfillScripts = `
		${polyfillTooOld}
		<script type="text/javascript">${legacyLoaderString}</script>
`;
//		<script src="https://cdn.jsdelivr.net/es6-promise-polyfill/1.2.0/promise.min.js"></script>