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import React from "react"; | |
type Status = "idle" | "pending" | "resolved" | "rejected"; | |
interface RequestState<DataType> { | |
data: DataType | null; | |
status: Status; | |
error: unknown; | |
} | |
interface Pending { | |
type: "pending"; | |
} | |
interface Resolved<DataType> { | |
type: "resolved"; | |
payload: { data: DataType }; | |
} | |
interface Rejected { | |
type: "rejected"; | |
payload: { error: unknown }; | |
} | |
type Actions<DataType> = Pending | Resolved<DataType> | Rejected; | |
type Reducer<DataType> = (_: RequestState<DataType>, action: Actions<DataType>) => RequestState<DataType> | |
function reducer<DataType>( | |
_: RequestState<DataType>, | |
action: Actions<DataType> | |
): RequestState<DataType> { | |
switch (action.type) { | |
case "pending": { | |
return { status: "pending", data: null, error: null }; | |
} | |
case "resolved": { | |
return { status: "resolved", data: action.payload.data, error: null }; | |
} | |
case "rejected": { | |
return { status: "rejected", data: null, error: action.payload.error }; | |
} | |
default: { | |
throw new Error(`Unhandled action type`); | |
} | |
} | |
} | |
function useRequest<DataType>( | |
initialState: Partial<RequestState<DataType>> = {} | |
): { | |
data: DataType | null; | |
error: unknown; | |
status: Status; | |
runRequest: (requestPromise: Promise<DataType>) => Promise<void>; | |
} { | |
const [state, dispatch] = React.useReducer<Reducer<DataType>>(reducer, { | |
status: "idle", | |
data: null, | |
error: null, | |
...initialState, | |
}); | |
const { data, error, status } = state; | |
const runRequest = React.useCallback( | |
async (requestPromise: Promise<DataType>) => { | |
dispatch({ type: "pending" }); | |
try { | |
const response = await requestPromise; | |
dispatch({ type: "resolved", payload: { data: response } }); | |
} catch (error) { | |
dispatch({ type: "rejected", payload: { error } }); | |
} | |
}, | |
[dispatch] | |
); | |
return { | |
data, | |
error, | |
status, | |
runRequest, | |
}; | |
} | |
export default useRequest; |
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