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| import { useReducer, useEffect } from "react"; | |
| // pathToRegexp can be replaced with URLPattern once browser support improves | |
| // https://developer.mozilla.org/en-US/docs/Web/API/URLPattern | |
| import pathToRegexp from "path-to-regexp"; | |
| const Router = { | |
| PushStateEventType: "pushstate", | |
| ReplaceStateEventType: "replacestate", | |
| PopStateEventType: "popstate", | |
| HashChangeEventType: "hashchange", | |
| get location() { | |
| return { | |
| href: window.location.href, | |
| pathname: window.location.pathname, | |
| searchParams: new URLSearchParams(window.location.search), | |
| hash: window.location.hash.replace(/^#/, ""), | |
| }; | |
| }, | |
| match(pattern: string) { | |
| const result = pathToRegexp.match(pattern)(this.location.pathname); | |
| if (!result) { | |
| return null; | |
| } | |
| return { | |
| pathname: result.path, | |
| params: new Map(Object.entries(result.params)), | |
| }; | |
| }, | |
| subscribe(callback: () => void) { | |
| window.addEventListener(this.PushStateEventType, callback); | |
| window.addEventListener(this.ReplaceStateEventType, callback); | |
| window.addEventListener(this.PopStateEventType, callback); | |
| window.addEventListener(this.HashChangeEventType, callback); | |
| return () => { | |
| window.removeEventListener(this.PushStateEventType, callback); | |
| window.removeEventListener(this.ReplaceStateEventType, callback); | |
| window.removeEventListener(this.PopStateEventType, callback); | |
| window.removeEventListener(this.HashChangeEventType, callback); | |
| }; | |
| }, | |
| push(url: string | URL) { | |
| history.pushState(null, "", url); | |
| dispatchEvent(new CustomEvent(this.PushStateEventType)); | |
| }, | |
| replace(url: string | URL) { | |
| history.replaceState(null, "", url); | |
| dispatchEvent(new CustomEvent(this.ReplaceStateEventType)); | |
| }, | |
| go(delta: number) { | |
| history.go(delta); | |
| }, | |
| }; | |
| function useRouter() { | |
| const [, forceUpdate] = useReducer((x) => x + 1, 0); | |
| useEffect(() => Router.subscribe(forceUpdate), []); | |
| return Router; | |
| } | |
| function SignInScreen() { | |
| const router = useRouter(); | |
| if (!router.match("/sign-in")) { | |
| return null; | |
| } | |
| return ( | |
| <> | |
| <h1>Sign In</h1> | |
| ... | |
| </> | |
| ) | |
| } |
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