All files / src/components wrapper-for-404-redirects-from-github-pages.tsx

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import React, { useState, useEffect } from "react";
import { useLocation, Redirect } from "react-router-dom";
 
/** @private */
interface Props {
	children: JSX.Element;
}
 
/** @private */
const isReady = (): boolean => document.readyState !== "loading";
 
export default function WrapperFor404RedirectsFromGitHubPages({ children }: Props): JSX.Element {
	const location = useLocation();
	const [ triedPath, setTriedPath ] = useState<string>();
	const [ ready, setReady ] = useState(isReady());
	const [ keepAlive, setKeepAlive ] = useState<number>();
 
	useEffect(() => {
		const tried = new URLSearchParams(location.search).get("tried");
 
		if (tried != null)
			setTriedPath(tried);
	}, [ location ]);
 
	useEffect(() => {
		if (!ready && isReady())
			setReady(true);
	}, [ ready, keepAlive ]);
 
	useEffect(() => {
		let timeoutID = setTimeout(function tick() {
			setKeepAlive(Math.random());
 
			if (!ready)
				timeoutID = setTimeout(tick, 1000);
		}, 1000);
 
		return (): void => {
			clearTimeout(timeoutID);
		};
	}, [ ready ]);
 
	if (triedPath != null && triedPath !== window.location.pathname)
		return <Redirect to={triedPath} />;
 
	if (!ready)
		return <></>;
 
	return children;
}