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Zod-validated, query-based useTimer Hook
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| import qs from "qs"; | |
| import { z, ZodSchema } from "zod"; | |
| import dayjs from "dayjs"; | |
| import duration from "dayjs/plugin/duration"; | |
| import { useEffect, useRef, useState } from "react"; | |
| dayjs.extend(duration); | |
| const parseObjectPrimitives = (obj: Record<string, any>): any => { | |
| return Object.fromEntries( | |
| Object.entries(obj).map(([k, v]) => { | |
| if (typeof v === "object") return [k, parseObjectPrimitives(v)]; | |
| if (!isNaN(v)) return [k, parseFloat(v)]; | |
| if (v === "true") return [k, true]; | |
| if (v === "false") return [k, false]; | |
| if (typeof v === "string") return [k, v]; | |
| return [k, null]; | |
| }) | |
| ); | |
| }; | |
| export function useZodValidatedQueryString<T>(schema: ZodSchema<T>) { | |
| const queryString = window.location.search; | |
| const parsed = | |
| typeof queryString === "string" | |
| ? qs.parse(queryString, { | |
| ignoreQueryPrefix: true | |
| }) | |
| : queryString; | |
| const zResult = schema.safeParse(parseObjectPrimitives(parsed)); | |
| return { | |
| query: zResult.success ? zResult.data : ({} as T), | |
| errors: !zResult.success | |
| ? zResult.error.issues.map(i => `${i.path.join(".")}: ${i.message}`).reduce((acc, v) => (acc.includes(v) ? acc : [...acc, v]), [] as string[]) | |
| : [] | |
| }; | |
| } | |
| export function useTimer() { | |
| const { query, errors } = useZodValidatedQueryString(z.object({ | |
| time: z.string().regex(/^\d{1,2}:\d{2}$/).nullable(), | |
| })); | |
| const d = useRef(new Date()); | |
| const [timeLeft, setTimeLeft] = useState(d.current.getTime() - Date.now()); | |
| useEffect(() => { | |
| let interval: NodeJS.Timer; | |
| if (query.time) { | |
| const [hours, minutes] = query.time.split(":"); | |
| d.current.setHours(parseInt(hours || "0"), parseInt(minutes || "0"), 0, 0); | |
| interval = setInterval(() => { | |
| setTimeLeft(Math.max(0, d.current.getTime() - Date.now())); | |
| }, 1000); | |
| } | |
| else { | |
| setTimeLeft(0); | |
| } | |
| return () => clearInterval(interval); | |
| }, [query.time]); | |
| return { | |
| timeLeft, | |
| timer: dayjs.duration(timeLeft, "milliseconds").format("HH:mm:ss"), | |
| errors | |
| } | |
| } | |
| ////////////////////////////////// | |
| function App() { | |
| const { timer, errors } = useTimer(); | |
| if (errors.length) return errors.map((error, i) => <div key={i}>{error}</div>); | |
| return <div>{timer}</div> | |
| } |
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