Created
November 19, 2021 11:05
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simple reducer for usage in React
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/* eslint-disable @typescript-eslint/ban-types */ | |
import { Reducer, useCallback, useReducer } from 'react' | |
import { useConstant } from 'hooks/useConstant' | |
const reducerCreator = | |
<S extends object>(filter?: (prev: S, curr: S) => boolean) => | |
(state: S, update: (prevState: S) => S | void) => { | |
const nextState = update(state) | |
return nextState === void 0 || (filter && filter(state, nextState)) | |
? state | |
: nextState | |
} | |
// eslint-disable-next-line @typescript-eslint/ban-types,@typescript-eslint/explicit-module-boundary-types | |
export const useSimpleReducer = <S extends object>({ | |
initialState: stateInitializer, | |
filter, | |
}: { | |
initialState: S | (() => S) | |
filter?: (prev: S, curr: S) => boolean | |
}) => { | |
const { initialState, reducer } = useConstant(() => { | |
return { | |
initialState: | |
typeof stateInitializer === 'function' | |
? stateInitializer() | |
: stateInitializer, | |
reducer: reducerCreator(filter), | |
} | |
}) | |
const [state, setState] = useReducer<Reducer<S, (prevState: S) => S | void>>( | |
reducer, | |
initialState, | |
) | |
const updateState = useCallback((update: Partial<S>) => { | |
setState((prev) => ({ ...prev, ...update })) | |
}, []) | |
const resetState = useCallback(() => { | |
setState(() => ({ ...initialState })) | |
}, []) | |
return [state, updateState, resetState] as const | |
} |
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