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import { DependencyList, useCallback, useRef, useState } from 'react';
import useMountedState from './useMountedState';
import { FunctionReturningPromise, PromiseType } from './misc/types';
export type AsyncState<T> =
| {
loading: boolean;
error?: undefined;
value?: undefined;
}
| {
loading: true;
error?: Error | undefined;
value?: T;
}
| {
loading: false;
error: Error;
value?: undefined;
}
| {
loading: false;
error?: undefined;
value: T;
};
type StateFromFunctionReturningPromise<T extends FunctionReturningPromise> = AsyncState<
PromiseType<ReturnType<T>>
>;
export type AsyncFnReturn<T extends FunctionReturningPromise = FunctionReturningPromise> = [
StateFromFunctionReturningPromise<T>,
T
];
export default function useAsyncFn<T extends FunctionReturningPromise>(
fn: T,
deps: DependencyList = [],
initialState: StateFromFunctionReturningPromise<T> = { loading: false }
): AsyncFnReturn<T> {
const lastCallId = useRef(0);
const isMounted = useMountedState();
const [state, set] = useState<StateFromFunctionReturningPromise<T>>(initialState);
const callback = useCallback((...args: Parameters<T>): ReturnType<T> => {
const callId = ++lastCallId.current;
if (!state.loading) {
set((prevState) => ({ ...prevState, loading: true }));
}
return fn(...args).then(
(value) => {
isMounted() && callId === lastCallId.current && set({ value, loading: false });
return value;
},
(error) => {
isMounted() && callId === lastCallId.current && set({ error, loading: false });
return error;
}
) as ReturnType<T>;
}, deps);
return [state, callback as unknown as T];
}
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