Created
November 7, 2022 12:23
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useFetch hook for react.
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import { DependencyList, useEffect, useReducer, useState } from "react"; | |
interface State<T> { | |
data: T | null; | |
error: unknown | null; | |
loading: boolean; | |
loaded: boolean; | |
} | |
type Action<T> = | |
| { type: "FETCH_INIT" } | |
| { type: "FETCH_SUCCESS"; payload: T } | |
| { type: "FETCH_FAILURE"; payload: unknown }; | |
const initialState = { | |
data: null, | |
loading: true, | |
loaded: false, | |
error: null, | |
}; | |
export function useFetch<T>(input: RequestInfo, init?: RequestInit): State<T> { | |
const [state, dispatch] = useReducer< | |
(state: State<T>, action: Action<T>) => State<T> | |
>(reducer, initialState); | |
useEffect(() => { | |
const abortController = new AbortController(); | |
const fetchData = async () => { | |
dispatch({ type: "FETCH_INIT" }); | |
try { | |
const res = await fetch(input, { | |
...init, | |
signal: abortController.signal, | |
}); | |
const data = await res.json(); | |
dispatch({ type: "FETCH_SUCCESS", payload: data }); | |
} catch (e: any) { | |
if (e.name === "AbortError") return; | |
dispatch({ type: "FETCH_FAILURE", payload: e }); | |
} | |
}; | |
fetchData(); | |
return () => { | |
abortController.abort(); | |
}; | |
}, [input, init]); | |
return state; | |
} | |
function reducer<T>(state: State<T>, action: Action<T>): State<T> { | |
switch (action.type) { | |
case "FETCH_INIT": | |
return { ...state, loading: true }; | |
case "FETCH_SUCCESS": | |
return { ...state, loading: false, loaded: true, data: action.payload }; | |
case "FETCH_FAILURE": | |
return { ...state, loading: false, loaded: true, error: action.payload }; | |
default: | |
return state; | |
} | |
} |
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